Pressure effect on magnetic phase transition and spin-glass-like behavior of GdCo2B2

doi:10.1088/1674-1056/25/6/067501

中国物理B ›› 2016, Vol. 25 ›› Issue (6): 67501-067501.doi: 10.1088/1674-1056/25/6/067501

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Pressure effect on magnetic phase transition and spin-glass-like behavior of GdCo₂B₂

Guang-Hui Hu(胡光辉), Ling-Wei Li(李领伟), Umehara Izuru

1 Department of Physics, Faculty of Engineering, Yokohama National University, Yokohama 240-8501, Japan;
2 Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China

收稿日期:2015-10-02 修回日期:2016-02-18 出版日期:2016-06-05 发布日期:2016-06-05
通讯作者: Guang-Hui Hu E-mail:hu-guanghui-rm@ynu.jp
基金资助:
Project supported by JSPS KAKENHI (Grant No. 24540366, Grant-in-Aid for Scientific Research (C)).

Pressure effect on magnetic phase transition and spin-glass-like behavior of GdCo₂B₂

Guang-Hui Hu(胡光辉)¹, Ling-Wei Li(李领伟)², Umehara Izuru¹

1 Department of Physics, Faculty of Engineering, Yokohama National University, Yokohama 240-8501, Japan;
2 Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China

Received:2015-10-02 Revised:2016-02-18 Online:2016-06-05 Published:2016-06-05
Contact: Guang-Hui Hu E-mail:hu-guanghui-rm@ynu.jp
Supported by:
Project supported by JSPS KAKENHI (Grant No. 24540366, Grant-in-Aid for Scientific Research (C)).

摘要/Abstract

摘要：

We systematically investigate the effect of pressure on the magnetic properties of GdCo₂B₂ on the basis of alternating current (AC) susceptibility, AC heat capacity and electrical resistivity measurements under pressures up to 2.2 GPa. A detailed magnetic phase diagram under pressure is determined. GdCo₂B₂ exhibits three anomalies that apparently reflect magnetic phase transitions, respectively, at temperatures T_C = 20.5 K, T₁ = 18.0 K and T_N = 11.5 K under ambient pressure. Under pressures up to 2.2 GPa, these anomalies are observed to slightly increase at T_C and T₁, and they coincide with each other above 1.6 GPa. Conversely, they decrease at T_N and disappear under pressures higher than 1.4 GPa. The results indicate that the low-temperature magnetic phases can be easily suppressed by pressure. Moreover, the spin-glass-like behavior of GdCo₂B₂ is examined in terms of magnetization, aging effect and frequency dependence of AC susceptibility. A separation between the zero-field-cooled (ZFC) and field-cooled (FC) magnetization curves becomes evident at a low magnetic field of 0.001 T. A long-time relaxation behavior is observed at 4 K. The freezing temperature T_f increases with frequency increasing.

关键词: GdCo₂B₂, high pressure effect, phase diagram, spin-glass-like behavior

Abstract:

Key words: GdCo₂B₂, high pressure effect, phase diagram, spin-glass-like behavior

中图分类号: (Metals and alloys)

75.20.En

75.50.Cc (Other ferromagnetic metals and alloys) 75.50.Ee (Antiferromagnetics)

胡光辉, 李领伟,. Pressure effect on magnetic phase transition and spin-glass-like behavior of GdCo₂B₂[J]. 中国物理B, 2016, 25(6): 67501-067501.

Guang-Hui Hu(胡光辉), Ling-Wei Li(李领伟), Umehara Izuru. Pressure effect on magnetic phase transition and spin-glass-like behavior of GdCo₂B₂[J]. Chin. Phys. B, 2016, 25(6): 67501-067501.

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Pressure effect on magnetic phase transition and spin-glass-like behavior of GdCo₂B₂

Pressure effect on magnetic phase transition and spin-glass-like behavior of GdCo₂B₂

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