Magnetocaloric effect in metamagnetic borocarbide DyNi_{2 鈭?#xa0;x}A_xB₂C (A = Co and Cr) compounds

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• 作者：Lingwei Li^a ; ^b ; ^{wei0396@hotmail.com} ; Haibo Fan^c ; Sho Matsui^b ; Dexuan Huo^a ; Katsuhiko Nishimura^b
• 关键词：RNi2B2C compound ; Magnetocaloric effect ; Antiferromagnetic superconductor
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 July, 2012
• 卷：529
• 期：Complete
• 页码：25-28
• 文件大小：471 K

摘要

The magnetic properties and magnetocaloric effect (MCE) in DyNi_{2 鈭?#xA0;x}A_xB₂C (A = Co and Cr, x = 0.1, and 0.2) compounds have been studied. Substitution of Co or Cr for Ni lowered the magnetic transition temperature T_M, and reduced the magnetic hysteresis of DyNi₂B₂C. An inverse MCE was observed, which is attributed to the nature of antiferromagnetic state under low magnetic field and at low temperatures for the present DyNi_{2 鈭?#xA0;x}A_xB₂C compounds. A normal large MCE was observed under higher magnetic field changes, which is related to a field-induced first order meatmagnetic transition from antiferromagnetic to ferromagnetic state. The values of are 16.3, 10.2 16.1, and 13.7 J kg^鈭? K^鈭? with a magnetic field change of 5 T for x = 0.1 (Co), 0.2 (Co), 0.1 (Cr), and 0.2 (Cr) in DyNi_{2 鈭?#xA0;x}A_xB₂C system, respectively. The magnetic transition, the origin of large MCE as well as its potential application in DyNi_{2 鈭?#xA0;x}A_xB₂C system were discussed.