Two-Dimensional Spin Dynamics in the Itinerant Ferromagnet LaCoPO Revealed by Magnetization and 31P-NMR Measurements
Two-Dimensional Spin Dynamics in the Itinerant Ferromagnet LaCoPO Revealed by Magnetization and 31P-NMR Measurements
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DOI：
10.1143/jpsj.78.113705
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发表时间：
2009-09
影响因子：
1.7
通讯作者：
H. Sugawara;K. Ishida;Y. Nakai;H. Yanagi;T. Kamiya;Y. Kamihara;M. Hirano;H. Hosono
中科院分区：
文献类型：
--
作者：
H. Sugawara;K. Ishida;Y. Nakai;H. Yanagi;T. Kamiya;Y. Kamihara;M. Hirano;H. Hosono
我们已经进行了磁化和31 P-NMR测量的巡游铁磁体LaCoPO（居里温度T居里<$44 K）的层状结构，以研究在顺磁状态下的自旋动力学。P位的Knight位移K与T居里以上的体磁化率χ之间的线性标度表明31 P核适合于研究磁性。的温度和磁场的依赖性的核自旋晶格弛豫速率除以温度1/T1 T在P网站显示巡回铁磁体，如ZrZn 2和Y（Co 1- x Al x）2的特征。此外，1/T1 T与T居里以上的χ之间的关系表明铁磁涨落具有二维（2D）特征.目前的数据表明，LaCoPO是一种独特的铁磁体，其中从晶体结构中预期的2D波动几乎在T居里以下占主导地位。
We have performed magnetization and 31 P-NMR measurements on the itinerant ferromagnet LaCoPO (Curie temperature T Curie ∼44 K) with a layered structure in order to investigate spin dynamics in the paramagnetic state. The linear scaling between the Knight shift K at the P site and the bulk susceptibility χ above T Curie indicates that the 31 P nucleus is suitable for investigating magnetic properties. The temperature and magnetic field dependences of the nuclear spin–lattice relaxation rate divided by the temperature 1/ T 1 T at the P site show characteristic features of itinerant ferromagnets, such as ZrZn 2 and Y(Co 1- x Al x ) 2 . In addition, the relationship between 1/ T 1 T and χ above T Curie suggests that ferromagnetic fluctuations possess a two-dimensional (2D) characteristic. The present data show that LaCoPO is a unique ferromagnet, where the 2D fluctuations anticipated from the crystal structure are predominant down to almost T Curie .