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Pressure-induced suppression of ferromagnetism in the itinerant ferromagnet LaCrSb3

Z. E. Brubaker, J. S. Harvey, J. R. Badger, R. R. Ullah, D. J. Campbell, Y. Xiao, P. Chow, C. Kenney-Benson, J. S. Smith, C. Reynolds, J. Paglione, R. J. Zieve, J. R. Jeffries, and V. Taufour
Phys. Rev. B 101, 214408 – Published 3 June 2020
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Abstract
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  • INTRODUCTION
  • EXPERIMENTAL METHODS
  • RESULTS
  • DISCUSSION
  • CONCLUSION
  • ACKNOWLEDGMENTS
    • References

    Abstract

    We have performed an extensive pressure-dependent structural, spectroscopic, and electrical transport study of LaCrSb3. The ferromagnetic phase (TC=120 K at p = 0 GPa) is fully suppressed by p = 26.5 GPa and the Cr moment decreases steadily with increasing pressure. The unit-cell volume decreases smoothly up to p = 55 GPa. We find that the bulk modulus and suppression of the magnetism are in good agreement with theoretical predictions, but the Cr moment decreases smoothly with pressure, in contrast to steplike drops predicted by theory. The ferromagnetic ordering temperature appears to be driven by the Cr moment.

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    • Received 7 April 2020
    • Revised 7 May 2020
    • Accepted 12 May 2020

    DOI:https://doi.org/10.1103/PhysRevB.101.214408

    ©2020 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Magnetic phase transitionsMagnetismPhase diagramsPressure effects
    1. Physical Systems
    Ferromagnets
    1. Techniques
    Pressure techniquesX-ray diffractionX-ray emission spectroscopy
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    Z. E. Brubaker1,2,3, J. S. Harvey2, J. R. Badger4, R. R. Ullah2, D. J. Campbell5, Y. Xiao6, P. Chow6, C. Kenney-Benson6, J. S. Smith6, C. Reynolds3, J. Paglione5, R. J. Zieve2, J. R. Jeffries3, and V. Taufour2

    • 1Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
    • 2Department of Physics, University of California, Davis, California 95616, USA
    • 3Lawrence Livermore National Laboratory, Livermore, California 94550, USA
    • 4Department of Chemistry, University of California, Davis, California 95616, USA
    • 5Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA
    • 6HP-CAT, X-ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA

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    Vol. 101, Iss. 21 — 1 June 2020

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    • Figure 1
      Figure 1

      (a) PXRD spectra at select pressures for LaCrSb3. (b)–(d) Total fit and LaCrSb3 contribution for spectra containing Sb-I, Sb-II, and Sb-III. Peak positions for each phase are indicated; from top to bottom the peak locations correspond to LaCrSb3, Cu, Re, Sb-I/Sb-II in (b) and (c) and to LaCrSb3, Cu, Re, Ne, Sb-III in (d). The small jump observed near 15 degrees in (a) was excluded in the fitting, which is why there is a small gap in (b)–(d) near 15 degrees. The arrows in (b) near 8 degrees indicate unindexed peaks which disappeared by about p = 10 GPa. Unlike LaCrSb3, these did not show any single-crystal peaks in the 2D pattern, making these unlikely to be related to LaCrSb3. Overall, the LaCrSb3 peaks broaden considerably and decrease in intensity under pressure. (e) Evolution of volume with pressure. The solid line is a fit to the Birch-Murnaghan equation of state, which yields values of B = 79.8 GPa and B′=3.85, in good agreement with theoretical predictions [6]. (f) Lattice parameters found from the PXRD spectra. The solid line is a fit to the Birch-Murnaghan equation of state for the c-axis data (performed by fitting to V=c3) and is used to convert pressure to Cr-Cr distance.

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    • Figure 2
      Figure 2

      (a)–(c) Resistivity measurements and (d)–(f) derivatives with the current and voltage in (a),(d) the [bc] plane; (b),(e) the [ac] plane; and (c),(f) the [ab] plane. Each plot includes the same P=0 GPa resistivity measurement; this was not repeated for different current directions. For the 7.5 and 12.2 GPa data in (d), we only plot the derivative for data taken with constant gain on the PPMS resistance bridge, resulting in a lower data point density. Above these pressures, the gain was held constant. The arrows and white circles indicate TC. The transition width corresponds to the linear region of dR/dT/R (170 K) near TC, and TC corresponds to the midpoint of the transition width, which is roughly equivalent to the inflection point. Several curves in (d)–(f) show sharp jumps below 10 K and also near 150–200 K, which were irreproducible and we attribute them to bad electrical contacts.

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    • Figure 3
      Figure 3

      Constant field resistivity measurements at select pressures with field along the (a) c axis and (b),(c) a axis.

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    • Figure 4
      Figure 4

      Phase diagram determined from resistivity (this work) and magnetization measurements [16]. The ferromagnetic phase is robust against pressures below 6 GPa and shows a nearly linear suppression beyond 6 GPa. Our data also suggests a plateau in TC from 17.5 to 23 GPa and a sudden suppression at the highest measured pressures, though this hinges on a single data point. Error bars correspond to the transition width, as determined by the linear region of dR/dT/R (170 K) near TC.

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    • Figure 5
      Figure 5

      X-ray emission spectra for each of the measured pressures. The cyan curves are the ambient pressure measurement, the red curves are the pressurized measurements, and the black curve is the difference between the two curves and is shifted by −0.1. The Kβ peak gradually shifts to lower energies, indicating a decreasing Cr moment.

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    • Figure 6
      Figure 6

      IAD values (blue triangles) and peak shift (green circles) plotted vs pressure (bottom) and Cr-Cr distance (top). Both IAD values and the peak shift indicate similar qualitative behavior.

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    • Figure 7
      Figure 7

      Comparison of experimental IAD values with the predicted pressure dependence of the Cr moment [6]. The low-pressure region agrees well, but our measurements show a steady decline in the Cr moment rather than two steplike features.

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    • Figure 8
      Figure 8

      Ordering temperature plotted against IAD value. Error bars for TC have been omitted for clarity.

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