| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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 |
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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.
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Received: 02 October 2015
Revised: 18 February 2016
Accepted manuscript online:
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PACS:
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75.20.En
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(Metals and alloys)
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75.50.Cc
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(Other ferromagnetic metals and alloys)
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75.50.Ee
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(Antiferromagnetics)
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| Fund: Project supported by JSPS KAKENHI (Grant No. 24540366, Grant-in-Aid for Scientific Research (C)). |
Corresponding Authors:
Guang-Hui Hu
E-mail: hu-guanghui-rm@ynu.jp
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Cite this article:
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 2016 Chin. Phys. B 25 067501
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