Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/111427
Title: Pressure-Induced Dimerization and Collapse of Antiferromagnetism in the Kitaev Material α-Li2IrO3
Authors: Shen, B.
Breitner, F.
Prishchenko, D.
Manna, R. S.
Jesche, A.
Seidler, M. L.
Gegenwart, P.
Tsirlin, A. A.
Issue Date: 2022
Publisher: American Physical Society
American Physical Society (APS)
Citation: Pressure-Induced Dimerization and Collapse of Antiferromagnetism in the Kitaev Material α-Li2IrO3 / B. Shen, F. Breitner, D. Prishchenko et al. // Physical Review B. — 2022. — Vol. 105. — Iss. 5. — 054412.
Abstract: We present magnetization measurements carried out on polycrystalline and single-crystalline samples of α-Li2IrO3 under hydrostatic pressures up to 2 GPa and establish the temperature-pressure phase diagram of this material. The Néel temperature (TN) of α-Li2IrO3 is slightly enhanced upon compression with dTN/dp = 1.5 K/GPa. Above 1.2 GPa, α-Li2IrO3 undergoes a first-order phase transition toward a nonmagnetic dimerized phase, with no traces of the magnetic phase observed above 1.8 GPa at low temperatures. The critical pressure of the structural dimerization is strongly temperature dependent. This temperature dependence is well reproduced on the ab initio level by taking into account lower phonon entropy in the nonmagnetic phase. We further show that the initial increase in TN of the magnetic phase is due to a weakening of the Kitaev interaction K along with the enhancement of the Heisenberg term J and off-diagonal anisotropy Γ. Our study reveals a common thread in the interplay of magnetism and dimerization in pressured Kitaev materials. © 2022 American Physical Society.
Keywords: DIMERIZATION
HYDROSTATIC PRESSURE
MAGNETISM
TEMPERATURE DISTRIBUTION
CRYSTALLINE SAMPLES
DIMERIZATIONS
FIRST-ORDER PHASE TRANSITIONS
LOWS-TEMPERATURES
MAGNETIC PHASE
MAGNETIZATION MEASUREMENTS
NONMAGNETICS
POLYCRYSTALLINE
PRESSURE PHASIS
SINGLE-CRYSTALLINE
PHASE DIAGRAMS
URI: http://hdl.handle.net/10995/111427
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85125177625
ISSN: 2469-9950
metadata.dc.description.sponsorship: This work was funded by the German Research Foundation (DFG) via Project No. 107745057 (TRR80) and via the Sino-German Cooperation Group on Emergent Correlated Matter. D.P. acknowledges financial support by the Russian Science Foundation, Grant No. 21-72-10136.
RSCF project card: 21-72-10136
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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