- Jesus College
University of Cambridge
Cambridge CB5 8BL
United Kingdom
Siddharth S Saxena
University of Cambridge, Cambridge Central Asia Forum, Faculty Member
- History, Anthropology, Sociology, Physics, International Relations, Social Sciences, and 404 moreCultural Studies, Religion, Political Philosophy, Development Studies, Political Economy, International Studies, Social and Cultural Anthropology, Higher Education, Political Sociology, Renewable Energy, Sustainable Development, Ethnography, Postcolonial Studies, Islamic Studies, Sociolinguistics, Peace and Conflict Studies, Materials Science, International Relations Theory, Environmental Studies, Middle East Studies, Social Theory, Intellectual History, Area Studies, Intercultural Communication, Cultural Sociology, International Security, International Development, Military History, Social Anthropology, International Political Economy, Development communication, Religion and Politics, Identity (Culture), History of Ideas, Nationalism, Ethnomusicology, History of Religion, Media Sociology, Science, Ottoman History, Jewish Studies, Energy, Urban Anthropology, Cultural Memory, History and 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- Siddharth Saxena is Director of the Cambridge Central Asia Forum, Jesus College, University of Cambridge and Principa... moreSiddharth Saxena is Director of the Cambridge Central Asia Forum, Jesus College, University of Cambridge and Principal Research Associate, Cavendish Laboratory, Department of Physics, University of Cambridgeedit
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Research Interests: History and Central Asia
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Submitted for the MAR17 Meeting of The American Physical Society Weak electron-phonon pairing in BiS2 superconductor from first principles RYOSUKE AKASHI, The University of Tokyo, Japan, CORENTIN MORICE1, The University of Cambridge,... more
Submitted for the MAR17 Meeting of The American Physical Society Weak electron-phonon pairing in BiS2 superconductor from first principles RYOSUKE AKASHI, The University of Tokyo, Japan, CORENTIN MORICE1, The University of Cambridge, United Kingdom, TAKASHI KORETSUNE, RIKEN Center for Emergent Matter Science, Japan, SIDDHARTH SAXENA, The University of Cambridge, United Kingdom, RYOTARO ARITA, RIKEN Center for Emergent Matter Science, Japan — The discovery of superconductivity in Bi4O4S3, quickly followed by the one in La(O,F)BiS2, opened up a new research field: novel BiS2 superconductors. Many thorough experimental studies have been conducted but consensus on the nature of superconductivity in these materials has not been reached yet. One of the strongest pieces of evidence until now was the calculation of strong electron-phonon coupling in La(O,F)BiS2 using ab-initio techniques, indicating that superconductivity in these materials is conventional and strongly coupled. Using densit...
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An amendment to this paper has been published and can be accessed via a link at the top of the paper.
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Dielectric constant and loss data as a function of temperature at the pressures given in the folder names along with the resistivity of tin that is used as manometer. Additionally, a workbook showing the numerical calculation methods and... more
Dielectric constant and loss data as a function of temperature at the pressures given in the folder names along with the resistivity of tin that is used as manometer. Additionally, a workbook showing the numerical calculation methods and then the figures showing the results of these calculations.
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Bi4O4S3 was the first superconductor discovered in the BiS2 family of novel superconductors. The subfamily of Bi-O-S systems now expanded andwas probed both theoretically and experimentally. Here we review the experimentalwork done on the... more
Bi4O4S3 was the first superconductor discovered in the BiS2 family of novel superconductors. The subfamily of Bi-O-S systems now expanded andwas probed both theoretically and experimentally. Here we review the experimentalwork done on the Bi-O-S compounds, and compare it with theoretical results obtained using ab-initio methods. In particular we calculate the charge carrier density using an ab-initio calculated density of states, and find a really close agreement with experimental data.
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The occurrence of superconductivity in doped SrTiO3 at low carrier densities points to the presence of an unusually strong pairing interaction that has eluded understanding for several decades. We report experimental results showing the... more
The occurrence of superconductivity in doped SrTiO3 at low carrier densities points to the presence of an unusually strong pairing interaction that has eluded understanding for several decades. We report experimental results showing the pressure dependence of the superconducting transition temperature, Tc, near to optimal doping that sheds light on the nature of this interaction. We find that Tc increases dramatically when the energy gap of the ferroelectric critical modes is suppressed, i.e., as the ferroelectric quantum critical point is approached in a way reminiscent to behaviour observed in magnetic counterparts. However, in contrast to the latter, the coupling of the carriers to the critical modes in ferroelectrics is predicted to be small. We present a quantitative model involving the dynamical screening of the Coulomb interaction and show that an enhancement of Tc near to a ferroelectric quantum critical point can arise due to the virtual exchange of longitudinal hybrid-pola...
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The dielectric and magnetic polarizations of quantum paraelectrics and paramagnetic materials have in many cases been found to initially increase with increasing thermal disorder and hence, exhibit peaks as a function of temperature. A... more
The dielectric and magnetic polarizations of quantum paraelectrics and paramagnetic materials have in many cases been found to initially increase with increasing thermal disorder and hence, exhibit peaks as a function of temperature. A quantitative description of these examples of “order-by-disorder” phenomena has remained elusive in nearly ferromagnetic metals and in dielectrics on the border of displacive ferroelectric transitions. Here, we present an experimental study of the evolution of the dielectric susceptibility peak as a function of pressure in the nearly ferroelectric material, strontium titanate, which reveals that the peak position collapses toward absolute zero as the ferroelectric quantum critical point is approached. We show that this behavior can be described in detail without the use of adjustable parameters in terms of the Larkin–Khmelnitskii–Shneerson–Rechester (LKSR) theory, first introduced nearly 50 y ago, of the hybridization of polar and acoustic modes in qu...
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Historically, the geographical area of Eurasia represents the heart of the Silk Road, which was traversed by Italian merchants, Central Asian and Middle Eastern traders. It connected Central Asia with the Lower Volga and Northern China to... more
Historically, the geographical area of Eurasia represents the heart of the Silk Road, which was traversed by Italian merchants, Central Asian and Middle Eastern traders. It connected Central Asia with the Lower Volga and Northern China to Kara Korum (Mongolia) and for centuries facilitated trade from the east to the west and vice versa.1 The Mongol Empire in the 13th century connected peoples, goods and ideas via this Silk Road from China to the Mediterranean.2 Once the Mongols had conquered China, Russia, Transcaucasia and Iran, there was a blossoming of trade right across their empire which was in large part driven by funding provided by the Mongol Khans and their family members to Muslim, Central Asian and Chinese traders. In addition, by providing infrastructure and communication networks throughout the empire, the Mongols made trading more attractive and profitable. According to Cosmo (2005), ‘the Mongols had indeed been exceptional in their ability to provide infrastructure underpinning trade even when formal backing of European states was lacking’.3 By 1221, Central Asian traders were playing a very important role in trade across the region.4 The union of China, Turkestan, Persia and Russia in one huge empire regulated by a strict Yasa5 under princes who were concerned for the safety of the caravans and tolerant of all cults, reopened by sea and by land the world routes that had been blocked since the end of antiquity.6
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Stephen Dale has undertaken a remarkable endeavour in writing this book on Zahir al-Din Muhammad Babur. In his own words Babur was the last great ‘Timurid-Chinggizid’, the man who initiated the ‘Timurid Renaissance’ and carried forward... more
Stephen Dale has undertaken a remarkable endeavour in writing this book on Zahir al-Din Muhammad Babur. In his own words Babur was the last great ‘Timurid-Chinggizid’, the man who initiated the ‘Timurid Renaissance’ and carried forward Timur’s legacy from Samarkand to Kabul and more importantly to Agra in North India thus creating the ‘Timurid-Mughal’ epoch. He presents in his book, ‘The Garden of the Eight Paradises,’ a thorough reading and analysis of the Baburnama substantiated with a chronicle of Islamic prose and poetry of the period (15th-16th centuries), and cross-referenced with historical sources ranging from Al-Baruni’s travelogue of Hindustan (11th century) to Abu Fazl’s 17th century Persian translation of Babur’s memoirs under Emperor Akbar (Babur’s grandson). Given the massive scope of the project there is on occasion a slide into erring to the side of too much detail making the material too dense and thus unreadable. For example, when Dale talks about various autobiographies written by other Muslim rulers or when he talks about Alisher Navoi’s (acclaimed Turki poet) life or even that of Amir Khusrau (court-writer under Ala-u-Din Khalji) of Hindustan.
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Newly discovered Bi-O-S compounds remain an enigma in attempts to understand their electronic properties. A recent study of Bi$_{4}$O$_{4}$S$_{3}$ has shown it to be a mixture of two phases, Bi$_{2}$OS$_{2}$ and Bi$_{3}$O$_{2}$S$_{3}$,... more
Newly discovered Bi-O-S compounds remain an enigma in attempts to understand their electronic properties. A recent study of Bi$_{4}$O$_{4}$S$_{3}$ has shown it to be a mixture of two phases, Bi$_{2}$OS$_{2}$ and Bi$_{3}$O$_{2}$S$_{3}$, the latter being superconducting [W. A. Phelan et al., J. Am. Chem. Soc. 135, 5372 (2013)]. Using density functional theory, we explore the electronic structure of both the phases and the effect of the introduction of stacking faults. Our results demonstrate that the S$_{2}$ layers dope the bismuth-sulphur bands. The bands at the Fermi level are of clear two-dimensional character. One band manifold is confined to the two adjacent, square-lattice bismuth-sulphur planes, a second manifold is confined to the square lattice of sulphur dimers. We show that the introduction of defects in the stacking does not influence the electronic structure. Finally, we also show that spin-orbit coupling does not have any significant effect on the states close to the Fermi level at the energy scale considered.
In this paper we discuss our discovery [T.E. Weller, et al., Nat. Phys., submitted for publication] of superconductivity in C6Yb and C6Ca at 6.5 and 11.5K, respectively. In addition, we present evidence based on an H–T phase diagram... more
In this paper we discuss our discovery [T.E. Weller, et al., Nat. Phys., submitted for publication] of superconductivity in C6Yb and C6Ca at 6.5 and 11.5K, respectively. In addition, we present evidence based on an H–T phase diagram demonstrating that these compounds are significantly more isotropic than pure graphite. This is unexpected as the effect of introducing the intercalant is
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ABSTRACT We have made a preliminary study of the evolution, with hydrostatic pressure, of the recently discovered superconductivity in the graphite intercalation compound C6Yb. We present a pressure–temperature phase diagram established... more
ABSTRACT We have made a preliminary study of the evolution, with hydrostatic pressure, of the recently discovered superconductivity in the graphite intercalation compound C6Yb. We present a pressure–temperature phase diagram established by electrical transport and magnetization measurements. In the range 0–1.2GPa, the superconducting transition temperature increases linearly with pressure (dTc/dP=+0.389±0.005K/GPa).
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In this paper we discuss our discovery [T.E. Weller, et al., Nat. Phys., submitted for publication] of superconductivity in C6Yb and C6Ca at 6.5 and 11.5K, respectively. In addition, we present evidence based on an H–T phase diagram... more
In this paper we discuss our discovery [T.E. Weller, et al., Nat. Phys., submitted for publication] of superconductivity in C6Yb and C6Ca at 6.5 and 11.5K, respectively. In addition, we present evidence based on an H–T phase diagram demonstrating that these compounds are significantly more isotropic than pure graphite. This is unexpected as the effect of introducing the intercalant is
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... Super-0 1 2 0 0.5 1 1.5 Resistivity [ µΩ cm] Temperature [K] 11 kbar 15 17 26 kbarCeNi 2 Ge 2 (b) 2 2.5 0 2 4 6 Resistivity [ µΩ cm] T1.4 [K1.4] (~ 4K) CeNi 2 Ge 2 11 kbar 17 kbar (a) 0 6 0.2 0.4 ρ [µΩ cm] T [K] 18 kbar Fig. ...
Research Interests: Biochemistry, Bioinformatics, Evolutionary Biology, Environmental Science, Developmental Biology, and 15 moreClimate Change, Computational Biology, Biotechnology, Cancer, Biology, Cell Cycle, Ecology, Drug Discovery, Evolution, Astrophysics, Functional Genomics, Astronomy, DNA, Cell Signalling, and Earth Science
Up to now the crystallographic structure of the magnetoelectric perovskite EuTiO3 was considered to remain cubic down to low temperature. Here we present high resolution synchrotron X-ray powder diffraction data showing the existence of a... more
Up to now the crystallographic structure of the magnetoelectric perovskite EuTiO3 was considered to remain cubic down to low temperature. Here we present high resolution synchrotron X-ray powder diffraction data showing the existence of a structural phase transition, from cubic Pm-3m to tetragonal I4/mcm, involving TiO6 octahedra tilting, in analogy to the case of SrTiO3. The temperature evolution of the
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The location of a tricritical point in the (p,T) phase diagram of MnSi and the nature of the phase transition at both sides of this point are under discussion. While the tricritical point was traditionally placed at ptc=12kbar and Ttc=12K... more
The location of a tricritical point in the (p,T) phase diagram of MnSi and the nature of the phase transition at both sides of this point are under discussion. While the tricritical point was traditionally placed at ptc=12kbar and Ttc=12K , with the first-order transition at p>ptc , recent studies [Stishov , Phys. Rev. B 76, 052405 (2007)] suggested that it should be located at ptc=3.5kbar and Ttc=25K with the transition being second order for p>ptc . Based on a direct analysis of the magnetic phase transition under pressure, we demonstrate that the coordinates of the tricritical point are indeed ptc=3.5(3)kbar and Ttc=24K but with the magnetic phase transition changing from second to first order as pressure increases. We also discuss the effect of spin fluctuations in the transport and magnetic properties of MnSi.
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ABSTRACT
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The unconventional nonmagnetic metal CeNi2Ge2 is characterised at ambient pressure by temperature dependences of the specific heat and of the resistivity which deviate strongly from standard Fermi-liquid predictions and are reminiscent of... more
The unconventional nonmagnetic metal CeNi2Ge2 is characterised at ambient pressure by temperature dependences of the specific heat and of the resistivity which deviate strongly from standard Fermi-liquid predictions and are reminiscent of the behaviour observed in its sibling system CePd2Si2 above the critical pressure at which magnetic order is suppressed. We have explored the CePd2Si2/CeNi2Ge2 phase diagram in a series
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Research Interests: Biochemistry, Bioinformatics, Evolutionary Biology, Environmental Science, Developmental Biology, and 15 moreClimate Change, Computational Biology, Biotechnology, Cancer, Biology, Cell Cycle, Ecology, Drug Discovery, Evolution, Astrophysics, Functional Genomics, Astronomy, DNA, Cell Signalling, and Earth Science
Research Interests: Biochemistry, Bioinformatics, Environmental Science, Developmental Biology, Climate Change, and 15 moreComputational Biology, Biotechnology, Cancer, Biology, Cell Cycle, Ecology, Drug Discovery, Evolution, Astrophysics, Astronomy, DNA, Cell Signalling, Electrical Resistance, Copper Oxide, and Earth Science
The long overdue edited volume of conference proceedings from the 2011 (yes, 2011!) ESCAS conference. With my profound apologies to all contributors for the long delay in publication.