Re-entrant spin glass behaviour and large magnetocaloric effect in Er2PtSi3

International Conference on Strongly Correlated Electron Systems 2016

Li, D.X.^1 ; Homma, Y.^1 ; Nakamura, A.^1 ; Honda, F.^1 ; Yamamura, T.^2 ; Aoki, D.^1

Institute for Materials Research, Tohoku University, Oarai, Ibaraki

311-1313, Japan^1

Institute for Materials Research, Tohoku University, Sendai

980-8577, Japan^2

关键词: Adiabatic temperature change;    Magnetic entropy change;    Magnetic phase transitions;    Magnetic refrigeration materials;    Reentrant spin glass;    Relative cooling power;    Spin freezing state;    Ternary intermetallic compound;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/4/042003/pdf
DOI  :  10.1088/1742-6596/807/4/042003

来源: IOP

【 摘 要 】

We present the magnetic properties and magnetocaloric effect of ternary intermetallic compound Er2PtSi3with the orthorhombic Ba2LiSi3-type structure. Dc magnetization, ac susceptibilit, magnetic relaxation, electrical resistivity and specific heat measurements indicate that this system undergoes two magnetic phase transitions from a paramagnetic state sequentially to an antifwerromagnetic state at TN=5.4 K and then to a random spin freezing state at Tf=2.4 K. In addition, the large magnetocaloric effect is also observed for the Er2PtSi3alloy. Near its Néel temperature TN, the maximum magnetic entropy change, relative cooling power and maximum adiabatic temperature change are estimated to be 16.1 Jkg-1K-1, 290 Jkg-1and 7.7 K, respectively, for a field change of 5 T. These results suggest that Er2PtSi3should be classified as a re-entrant spin-glass system and can be considered as a potential lowerature magnetic refrigeration material.