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. 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. 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:

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 TC = 20.5 K, T1 = 18.0 K and TN = 11.5 K under ambient pressure. Under pressures up to 2.2 GPa, these anomalies are observed to slightly increase at TC and T1, and they coincide with each other above 1.6 GPa. Conversely, they decrease at TN 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 Tf increases with frequency increasing.

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

Abstract:

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 TC = 20.5 K, T1 = 18.0 K and TN = 11.5 K under ambient pressure. Under pressures up to 2.2 GPa, these anomalies are observed to slightly increase at TC and T1, and they coincide with each other above 1.6 GPa. Conversely, they decrease at TN 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 Tf increases with frequency increasing.

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)