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Title: Thermal and magnetoelastic properties of $$α - \mathrm{RuCl_3}$$ in the field-induced low-temperature states

Abstract

Here, we discuss the implications that new magnetocaloric, thermal expansion, and magnetostriction data in α-RuCl3 single crystals have on its temperature-field phase diagram and uncover the magnetic-field dependence of an apparent energy gap structure Δ(H) that evolves when the low-temperature antiferromagnetic order is suppressed. We show that, depending on how the thermal expansion data are modeled, Δ(H) can show a cubic field dependence and remain finite at zero field, consistent with the pure Kitaev model hosting itinerant Majorana fermions and localized Z2 fluxes. Our magnetocaloric effect data provide, below 1K, unambiguous evidence for dissipative phenomena at Hc, a smoking gun for a first-order phase transition. Conversely, our results show little support for a phase transition from a QSL to a polarized paramagnetic state above Hc.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [3];  [3];  [4];  [1];  [1]; ORCiD logo [5];  [2]; ORCiD logo [6]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Tokyo (Japan)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  4. Univ. of Florida, Gainesville, FL (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Physikalisch-Technische Bundesanstalt, Braunschweig (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); Gordon and Betty Moore Foundation
OSTI Identifier:
1756229
Grant/Contract Number:  
AC05-00OR22725; DMR-1644779; GBMF9069
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 102; Journal Issue: 21; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; antiferromagnetism; frustrated magnetism; magnetic phase transitions; magnetoelastic effect; magnetostriction; majorana fermions; phase diagrams; quantum phase transitions; thermal expansion

Citation Formats

Schönemann, Rico, Imajo, Shusaku, Weickert, Franziska, Yan, Jiaqiang, Mandrus, David G., Takano, Yasumasa, Brosha, Eric L., Rosa, Priscila S., Nagler, Stephen E., Kindo, Koichi, and Jaime, Marcelo. Thermal and magnetoelastic properties of $α - \mathrm{RuCl_3}$ in the field-induced low-temperature states. United States: N. p., 2020. Web. https://doi.org/10.1103/physrevb.102.214432.
Schönemann, Rico, Imajo, Shusaku, Weickert, Franziska, Yan, Jiaqiang, Mandrus, David G., Takano, Yasumasa, Brosha, Eric L., Rosa, Priscila S., Nagler, Stephen E., Kindo, Koichi, & Jaime, Marcelo. Thermal and magnetoelastic properties of $α - \mathrm{RuCl_3}$ in the field-induced low-temperature states. United States. https://doi.org/10.1103/physrevb.102.214432
Schönemann, Rico, Imajo, Shusaku, Weickert, Franziska, Yan, Jiaqiang, Mandrus, David G., Takano, Yasumasa, Brosha, Eric L., Rosa, Priscila S., Nagler, Stephen E., Kindo, Koichi, and Jaime, Marcelo. Thu . "Thermal and magnetoelastic properties of $α - \mathrm{RuCl_3}$ in the field-induced low-temperature states". United States. https://doi.org/10.1103/physrevb.102.214432.
@article{osti_1756229,
title = {Thermal and magnetoelastic properties of $α - \mathrm{RuCl_3}$ in the field-induced low-temperature states},
author = {Schönemann, Rico and Imajo, Shusaku and Weickert, Franziska and Yan, Jiaqiang and Mandrus, David G. and Takano, Yasumasa and Brosha, Eric L. and Rosa, Priscila S. and Nagler, Stephen E. and Kindo, Koichi and Jaime, Marcelo},
abstractNote = {Here, we discuss the implications that new magnetocaloric, thermal expansion, and magnetostriction data in α-RuCl3 single crystals have on its temperature-field phase diagram and uncover the magnetic-field dependence of an apparent energy gap structure Δ(H) that evolves when the low-temperature antiferromagnetic order is suppressed. We show that, depending on how the thermal expansion data are modeled, Δ(H) can show a cubic field dependence and remain finite at zero field, consistent with the pure Kitaev model hosting itinerant Majorana fermions and localized Z2 fluxes. Our magnetocaloric effect data provide, below 1K, unambiguous evidence for dissipative phenomena at Hc, a smoking gun for a first-order phase transition. Conversely, our results show little support for a phase transition from a QSL to a polarized paramagnetic state above Hc.},
doi = {10.1103/physrevb.102.214432},
journal = {Physical Review B},
number = 21,
volume = 102,
place = {United States},
year = {2020},
month = {12}
}

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