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Putative spin liquid in the triangle-based iridate Ba3IrTi2O9

W.-J. Lee, S.-H. Do, Sungwon Yoon, S. Lee, Y. S. Choi, D. J. Jang, M. Brando, M. Lee, E. S. Choi, S. Ji, Z. H. Jang, B. J. Suh, and K.-Y. Choi
Phys. Rev. B 96, 014432 – Published 26 July 2017
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  • INTRODUCTION
  • EXPERIMENTAL DETAILS
  • RESULTS AND DISCUSSION
  • CONCLUSIONS
  • ACKNOWLEDGMENTS
    • Supplemental Material
    References

    Abstract

    We report on thermodynamic, magnetization, and muon spin relaxation measurements of the strong spin-orbit coupled iridate Ba3IrTi2O9, which constitutes a distinct frustration motif made up of a mixture of edge- and corner-sharing triangles. In spite of a strong antiferromagnetic exchange interaction of the order of 100 K, we find no hint for long-range magnetic order down to 23 mK. The magnetic specific heat data unveil T-linear and T-squared dependences at low temperatures below 1 K. At the respective temperatures, the zero-field muon spin relaxation features a persistent spin dynamics, indicative of unconventional low-energy excitations. A comparison to the 4d isostructural compound Ba3RuTi2O9 suggests that a concerted interplay of compasslike magnetic interactions and frustrated geometry promotes a dynamically fluctuating state in a triangle-based iridate.

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    • Received 13 March 2017
    • Revised 22 May 2017

    DOI:https://doi.org/10.1103/PhysRevB.96.014432

    ©2017 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Frustrated magnetismQuantum spin liquid
    1. Techniques
    Magnetization measurementsMuon spin relaxation & rotation
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    W.-J. Lee1, S.-H. Do1, Sungwon Yoon2, S. Lee1, Y. S. Choi1, D. J. Jang3, M. Brando3, M. Lee4, E. S. Choi4, S. Ji5, Z. H. Jang6, B. J. Suh2, and K.-Y. Choi1,*

    • 1Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea
    • 2Department of Physics, The Catholic University of Korea, Bucheon 420-743, Republic of Korea
    • 3Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany
    • 4National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
    • 5Max Planck POSTECH Center for Complex Phase Materials, Pohang 37673, Republic of Korea
    • 6Department of Physics, Kookmin University, Seoul 136-702, Republic of Korea

    • *kchoi@cau.ac.kr

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    Issue

    Vol. 96, Iss. 1 — 1 July 2017

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    Images

    • Figure 1
      Figure 1

      (a) Triangular bilayers of Ir(1)4+/Ti(2)4+ which are separated by a nonmagnetic triangular layer of Ti(3)4+ and are stacked along the c axis. The blue, green, and red balls stand for Ir, Ti, and O atoms, respectively. The barium atoms are omitted for clarity. The gray solid lines depict the superexchange paths Ir-O-O-Ir. In the presence of the Ti4+/Ir4+ cation disorders within the Ir(1)Ti(2)O9 dimers, a nearly isotropic tetrahedron (J1≈J2) is created. (b) Temperature dependence of resistivity of Ba3MTi2O9 plotted on a log-log scale. The solid lines are fits to a power law ρ(T)∼T−n. (c) Temperature dependence of the magnetic susceptibility of Ba3MTi2O9 measured at H=500 Oe in zero-field-cooled and field-cooled processes. The solid lines represent the intrinsic magnetic susceptibility χintr(T) obtained by subtracting the contribution from orphan spins. The inset plots the inverse magnetic susceptibility. The Curie-Weiss fits are shown in the temperature range T=100–320 K with solid lines.

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    • Figure 2
      Figure 2

      Magnetization curve M(H) of Ba3IrTi2O9 and Ba3RuTi2O9 measured at T=1.5 K. The black circles are the experimental data and the red solid lines are fits of M(H) to the equation described in the text. The blue dashed lines are the contribution of orphan spins to magnetization, Mimp(H), and the green open circles represent the residual magnetization intrinsic to the system obtained by subtracting the orphan-spin contribution from the raw data.

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    • Figure 3
      Figure 3

      (a) Temperature dependence of specific heat of the Ba3MTi2O9 polycrystalline samples plotted on a log-log scale together with the nonmagnetic counterpart Ba3ZnSb2O9 (thick solid line). The specific heat measurements were performed for temperatures below 4 K and at zero magnetic field. (b) The magnetic specific heat Cm of Ba3MTi2O9, obtained by subtracting the nonmagnetic contribution. The solid lines are the fits of the Cm data to a power law γTα.

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    • Figure 4
      Figure 4

      (a), (b) Zero-field muon spin depolarization P(t) of Ba3MTi2O9, measured in the temperature range T=0.02–125 K. The solid lines are fitted to the stretched exponential function. (c), (d) Temperature dependence of the muon spin relaxation rate λZF and stretching exponent β extracted from the zero-field data. (e), (f) Longitudinal-field dependence of the muon spin depolarization measured at T=23 (50) mK for the Ru (Ir) compound in a magnetic field H=0–200 G.

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