Metamagnetic transition in Na 0.85 CoO2 single crystals.
Metamagnetic transition in Na 0.85 CoO2 single crystals.
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DOI：
10.1103/physrevlett.93.187203
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发表时间：
2004-04
影响因子：
8.6
通讯作者：
J. Luo;N. L. Wang;G. Liu;D. Wu;X. Jing;F. Hu;T. Xiang
中科院分区：
文献类型：
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作者：
J. Luo;N. L. Wang;G. Liu;D. Wu;X. Jing;F. Hu;T. Xiang
我们报道了高质量的Na(0.85)CoO2单晶在高达14T的外加磁场中的磁化强度、比热和输运测量。在高温下，系统处于顺磁相。对于磁场H||c，磁化强度、比热和磁阻的测量数据表明，在大约8T的低温下，它经历了从反铁磁态到准铁磁态的亚磁相变。然而，在14T以下的磁化强度测量中没有观察到H垂直c的相变。测定了Na(0.85)CoO2的低温磁相图。
We report the magnetization, specific heat, and transport measurements of a high quality Na(0.85)CoO2 single crystal in applied magnetic fields up to 14 T. At high temperatures, the system is in a paramagnetic phase. It undergoes a magnetic phase transition below approximately 20 K. For the field H||c, the measurement data of magnetization, specific heat, and magnetoresistance reveal a metamagnetic transition from an antiferromagnetic state to a quasiferromagnetic state at about 8 T at low temperatures. However, no transition is observed in the magnetization measurements up to 14 T for H perpendicular c. The low temperature magnetic phase diagram of Na(0.85)CoO2 is determined.