Anomalous Antiferromagnetic Phase Diagram in HoRu2Al10

International Conference on Strongly Correlated Electron Systems 2016

Kamikawa, S.^1 ; Ishii, I.^1 ; Goto, H.^1 ; Takezawa, K.^1 ; Nakagawa, F.^1 ; Tanida, H.^1 ; Sera, M.^1 ; Suzuki, T.^1,2,3

Department of Quantum Matter, ADSM, Hiroshima University, Higashihiroshima, Hiroshima

739-8530, Japan^1

Institute for Advanced Materials Research, Hiroshima University, Higashihiroshima, Hiroshima

739-8530, Japan^2

Cryogenics and Instrumental Analysis Division, N-BARD, Hiroshima University, Higashihiroshima, Hiroshima

739-8526, Japan^3

关键词: Antiferromagnetic phase;    Antiferromagnetics;    Lower temperatures;    Magnetic phase diagrams;    Monotonic decrease;    Performed specific-heat measurements;    Quadrupole moments;    Single-crystalline;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/1/012010/pdf
DOI  :  10.1088/1742-6596/807/1/012010

来源: IOP

【 摘 要 】

To investigate an antiferromagnetic (AFM) phase transition of HoRu2Al10with TN= 5.2 K, we performed specific heat measurements on a single-crystalline sample under magnetic fields H. In H along the b- and c-axes, a sharp peak of the specific heat at TN, indicating the phase transition, shifts to lower temperature with increasing H. From these measurements, we clarified a magnetic phase diagram for H // b and c above 2 K. In H // b, TNdecreases monotonically with increasing H, and then the phase boundary closes around 1.0 T, which is a usual behavior for an antiferromagnet. In H // c, although TNshows a monotonic decrease with increasing H at low H, the phase boundary exhibits an inflection point around 4.0 T, suggesting that additional interaction are enhanced or induced by H // c in HoRu2Al10. From the stand point of fluctuation of quadrupole moments in isomorphic compound HoFe2Al10, we propose that the inflection point is originated from a quadrupolar instability.