Large Magnetic Entropy Change in Dy_1-xHo_xNi₂B₂C ($x = 0{\mbox{--}}1$) Superconductors

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概要

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• The magnetocaloric effect in antiferromagnetic superconductors Dy_1-xHo_xNi₂B₂C ($x = 0$, 0.3, 0.5, 0.7, and 1) has been studied. The magnetic transition temperature $T_{\text{M}}$ as well as the temperature of the maximum magnetic entropy change ($-\Delta S_{\text{M}}{}^{\text{max}}$) gradually shift to low temperature with increasing $x$, while the values of $-\Delta S_{\text{M}}{}^{\text{max}}$ remain at almost the same high value. The observed large magnetic entropy is related to a field-induced first-order metamagnetic transition from antiferromagnetic to ferromagnetic state. The large values of $\Delta S_{\text{M}}$ and high relative cooling power with tuneable $T_{\text{M}}$ indicate that Dy_1-xHo_xNi₂B₂C could be used for low-temperature magnetic refrigeration.

• 2011-09-25

著者

• Nishimura Katsuhiko

  Graduate School Of Sci. And Engineering Univ. Of Toyama

• Namiki Takahiro

  Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan

• Li Lingwei

  Institute of Materials Physics, Hangzhou Dianzi University, Hangzhou 310018, Zhejiang, China

• Huo Dexuan

  Institute of Materials Physics, Hangzhou Dianzi University, Hangzhou 310018, Zhejiang, China

• Kadonaga Michiaki

  Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan

• Qian Zhenghong

  Center for Integrated Spintronic Devices, Hangzhou Dianzi University, Hangzhou 310018, Zhejiang, China

• Nishimura Katsuhiko

  Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan

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