TY - JOUR
T1 - Hydrostatic pressure effect on the Co-based honeycomb magnet BaCo2(AsO4)2
AU - Huyan, Shuyuan
AU - Schmidt, Juan
AU - Gati, Elena
AU - Zhong, Ruidan
AU - Cava, Robert J.
AU - Canfield, Paul C.
AU - Bud'Ko, Sergey L.
N1 - Funding Information:
We acknowledge useful discussions with S. M. Winter. Work at the Ames Laboratory was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. The Ames Laboratory is operated for the US Department of Energy by Iowa State University under Contract No. DE-AC02-07CH11358. J.S. was supported in part by the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant No. GBMF-4411. E.G. gratefully acknowledges financial support from the Max Planck Society and the Deutsche Forschungsgemeinschaft through SFB 1143 (Project No. 247310070) through Project No. C09. Work in Princeton (R.Z. and R.J.C.) was supported by Gordon and Betty Moore Foundation Grant No. GBMF-4412. S.L.B. would like to acknowledge the Russian Colloquium on Modern Problems of Condensed Matter Physics for help in initiating this project and Pavel A. Maksimov for helpful communication regarding Ref. .
Publisher Copyright:
© 2022 American Physical Society.
PY - 2022/5/1
Y1 - 2022/5/1
N2 - The honeycomb antiferromagnet BaCo2(AsO4)2, in which small in-plane magnetic fields (H1≈0.26 T and H2≈0.52 T at T=1.8 K<TN≈5.4 K) induce two magnetic phase transitions, has attracted attention as a possible candidate material for the realization of Kitaev physics based on the 3d element Co2+. Here, we report on the change in the transition temperature TN and the critical fields H1 and H2 of BaCo2(AsO4)2 with hydrostatic pressure up to ∼20 kbar, as determined from magnetization and specific heat measurements. Within this pressure range, a marginal increase in the magnetic ordering temperature is observed. At the same time, the critical fields are changed significantly (up to ∼25-35%). Specifically, we find that H1 is increased with hydrostatic pressure, i.e., the antiferromagnetic state is stabilized, whereas H2, which was previously associated with a transition into a proposed Kitaev spin-liquid state, decreases with increasing pressure. We discuss to what extent these results are compatible with suggested models with sizable third-nearest-neighbor exchange. Overall, the results put constraints on the magnetic models that are used to describe the low-temperature magnetic properties of BaCo2(AsO4)2.
AB - The honeycomb antiferromagnet BaCo2(AsO4)2, in which small in-plane magnetic fields (H1≈0.26 T and H2≈0.52 T at T=1.8 K<TN≈5.4 K) induce two magnetic phase transitions, has attracted attention as a possible candidate material for the realization of Kitaev physics based on the 3d element Co2+. Here, we report on the change in the transition temperature TN and the critical fields H1 and H2 of BaCo2(AsO4)2 with hydrostatic pressure up to ∼20 kbar, as determined from magnetization and specific heat measurements. Within this pressure range, a marginal increase in the magnetic ordering temperature is observed. At the same time, the critical fields are changed significantly (up to ∼25-35%). Specifically, we find that H1 is increased with hydrostatic pressure, i.e., the antiferromagnetic state is stabilized, whereas H2, which was previously associated with a transition into a proposed Kitaev spin-liquid state, decreases with increasing pressure. We discuss to what extent these results are compatible with suggested models with sizable third-nearest-neighbor exchange. Overall, the results put constraints on the magnetic models that are used to describe the low-temperature magnetic properties of BaCo2(AsO4)2.
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U2 - 10.1103/PhysRevB.105.184431
DO - 10.1103/PhysRevB.105.184431
M3 - Article
AN - SCOPUS:85131385980
SN - 2469-9950
VL - 105
JO - Physical Review B
JF - Physical Review B
IS - 18
M1 - 184431
ER -