Thermal and magnetoelastic properties of α − RuCl3 in the field-induced low-temperature states

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 antiferr...

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Published in:Physical review. B 2020-12, Vol.102 (21), p.1
Main Authors: Schönemann, Rico, Imajo, Shusaku, Weickert, Franziska, Yan, Jiaqiang, Mandrus, David G, Takano, Yasumasa, Brosha, Eric L, S Rosa, Priscila F, Nagler, Stephen E, Kindo, Koichi, Jaime, Marcelo
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Language:English
Subjects:
Antiferromagnetism
Crystals
Dependence
Energy gap
Fermions
Fluxes
Low temperature
Magnetic properties
Magnetostriction
Phase diagrams
Phase transitions
Ruthenium trichloride
Single crystals
Thermal expansion
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container_issue 21
container_start_page 1
container_title Physical review. B
container_volume 102
creator Schönemann, Rico
Imajo, Shusaku
Weickert, Franziska
Yan, Jiaqiang
Mandrus, David G
Takano, Yasumasa
Brosha, Eric L
S Rosa, Priscila F
Nagler, Stephen E
Kindo, Koichi
Jaime, Marcelo
description 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 1 K, 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_str_mv 10.1103/PhysRevB.102.214432
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subjects Antiferromagnetism
Crystals
Dependence
Energy gap
Fermions
Fluxes
Low temperature
Magnetic properties
Magnetostriction
Phase diagrams
Phase transitions
Ruthenium trichloride
Single crystals
Thermal expansion
title Thermal and magnetoelastic properties of α − RuCl3 in the field-induced low-temperature states
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