Crystal Field Effect on Superconducting Transition in Pr<I><SUB>x</SUB></I>Os<SUB>4</SUB>Sb<SUB>12</SUB>
Crystal Field Effect on Superconducting Transition in Pr<I><SUB>x</SUB></I>Os<SUB>4</SUB>Sb<SUB>12</SUB>
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Pr<I><SUB>x</SUB></I>Os<SUB>4</SUB>Sb<SUB>12</SUB>中超导转变的晶体场效应
DOI：
10.1143/jpsj.78.063701
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发表时间：
2009
影响因子：
1.7
通讯作者：
and H. Sato
中科院分区：
文献类型：
--
作者：
K. Tanaka;T. Namiki;A. Imamura;M. Ueda;T. Saito;S. Tatsuoka;R. Miyazaki;K. Kuwahara;Y. Aoki;and H. Sato
2009年4月6日接受; 2009年6月10日发表）我们首次成功地在高压（$4 GPa）下生长PrxOs 4Sb 12单晶，其中Pr位填充分数应该得到提高。从系统的测量的运输，磁性和热性能的生长单晶，我们发现了显着降低的起始超导转变温度Tc和显着增加的4f-电子晶体场（CF）之间的基态和第一激发态（ÁCF）的能量分裂，与那些报道的环境压力生长的单晶。此外，在高压生长的样品中，质量增强降低。Δ CF与Tc和质量增强之间的相关性表明，伴随CF激发的传导电子散射在该化合物的超导电性中起着至关重要的作用。
accepted April 6, 2009; published June 10, 2009) We have succeeded in growing PrxOs4Sb12 single crystals under high pressure ($4 GPa) for the first time, where the Pr site filling fraction is supposed to be enhanced. From the systematic measurement of the transport, magnetic, and thermal properties on the grown single crystals, we found a marked decrease in the onset superconducting transition temperature Tc and a considerable increase in the 4f-electron crystal field (CF) energy splitting between the ground state and the first excited state (ÁCF), compared with those reported on the ambient-pressure grown single crystals. Furthermore, the mass enhancement is reduced in the high-pressure grown samples. The correlation between ÁCF and both Tc and mass enhancement indicates the crucial role of conduction electron scattering accompanied by the CF excitation in the superconductivity of this compound.