Suppression of the metal-insulator transition by magnetic field in (Pr1-yYy)0.7Ca0.3CoO3 (y = 0.0625)
Suppression of the metal-insulator transition by magnetic field in (Pr1-yYy)0.7Ca0.3CoO3 (y = 0.0625)
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(Pr1-yYy)0.7Ca0.3CoO3 (y = 0.0625) 中磁场抑制金属-绝缘体转变
DOI：
10.1063/1.4884435
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发表时间：
2014
影响因子：
3.2
通讯作者：
Z. Jirak
中科院分区：
文献类型：
--
作者：
T. Naito;H. Fujishiro;T. Nishizaki;N. Kobayashi;J. Hejtmanek;K. Knizek;Z. Jirak
利用电阻率和磁化强度测量方法研究了（Pr{sub 1−y}Y{sub y}）{sub 0.7}Ca{sub 0.3}CoO{sub 3}化合物（y = 0.0625，T{sub MI-SS}=40 K）在一级金属-绝缘体（MI）和同时自旋态（SS）相变下限处的磁电阻率和磁化强度。等温实验表明，低温绝缘相可以通过施加的场和金属相返回远低于转变温度T{sub MI-SS}不稳定。随着磁场的减小，反向过程发生，具有显著的滞后。在固定磁场下进行的温度扫描揭示了随着磁场强度的增加，T{sub MI-SS}呈抛物线状下降，并且在9 T以上的磁场中完全抑制了MI-SS转变。
The (Pr{sub 1−y}Y{sub y}){sub 0.7}Ca{sub 0.3}CoO{sub 3} compound (y = 0.0625, T{sub MI-SS}=40 K), at the lower limit for occurrence of the first-order metal-insulator (MI) and simultaneous spin-state (SS) transitions, has been studied using electrical resistivity and magnetization measurements in magnetic fields up to 17 T. The isothermal experiments demonstrate that the low-temperature insulating phase can be destabilized by an applied field and the metallic phase returns well below the transition temperature T{sub MI-SS}. The reverse process with decreasing field occurs with a significant hysteresis. The temperature scans taken at fixed magnetic fields reveal a parabolic-like decrease in T{sub MI-SS} with increasing field strength and a complete suppression of the MI-SS transition in fields above 9 T.