High Field ESR Study of the S=1/2 Diamond-Chain Substance Cu3(CO3)2(OH)2 up to the Magnetization Plateau Region
High Field ESR Study of the S=1/2 Diamond-Chain Substance Cu3(CO3)2(OH)2 up to the Magnetization Plateau Region
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S=1/2 金刚石链物质 Cu3(CO3)2(OH)2 直至磁化平台区域的高场 ESR 研究
DOI：
10.1143/jpsj.72.2464
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发表时间：
2003
影响因子：
1.7
通讯作者：
M. Takano
中科院分区：
文献类型：
--
作者：
H. Ohta;S. Okubo;T. Kamikawa;T. Kunimoto;Y. Inagaki;H. Kikuchi;Takashi Saito;M. Azuma;M. Takano
在50 ~ 900 GHz的频率范围和1.8 ~ 265 K的温度范围内，利用36 t的脉冲磁场对Cu 3 (CO 3) 2 (OH) 2进行了高场ESR测量。在23 K以下的大g位移和线宽的特征温度依赖性与在5和23 K时观察到的两个最大磁化率有关。我们的ESR结果以及磁化和理论结果表明，在低场和低温下，系统的基态处于自旋流体（SF）相。在1.8 K的频率场相关测量中，首次观察到与1.5 K时从16 ~ 26 T的磁化平台密切相关的直接跃迁。观察到的频率场图表明，二聚体中的交换相互作用估计约为50 K （1057 GHz）。
High field ESR measurements of Cu 3 (CO 3 ) 2 (OH) 2 have been performed in the frequency region from 50 to 900 GHz and in the temperature region from 1.8 to 265 K using the pulsed magnetic field up to 36 T. The large g -shifts below 23 K and the characteristic temperature dependence of the linewidth are discussed in connection with the two maxima of magnetic susceptibility observed at 5 and 23 K. Our ESR results together with the magnetization and theoretical results suggest that the ground state of the system is in the spin fluid (SF) phase at low field and low temperature. From the frequency–field dependence measurements at 1.8 K, the direct transition, which is closely related to the magnetization plateau from 16 to 26 T at 1.5 K, is observed for the first time. The observed frequency–field diagram suggests that the exchange interaction in the dimer is estimated to be about 50 K (1057 GHz).