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arXiv 0909.2911cond-mat.str-elcond-mat.mtrl-sci
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YbFe2Al10-type CeT2Al10(T=Fe,Ru,Os)的新相变和压力效应

Novel phase transition and the pressure effect in YbFe2Al10-type CeT2Al10 (T=Fe, Ru, Os)

T. Nishioka, Y. Kawamura, T. Takesaka, R. Kobayashi, H. Kato, M. Matsumura, K. Kodama, K. Matsubayashi, Y. Uwatoko

摘要:

首次用Al自熔法成功地生长了正交晶系CeT_2Al_(10)(T=Fe,Ru,Os)单晶,并测量了8 GPa以下的电阻率、常压下的磁化率和比热。这些结果表明CeT_2Al_(10)属于重费米子化合物。CeRu_2Al_(10)和CeOs_2Al_(10)分别在27.3和28.7 K时表现出相似的相变。在有序相的温度依赖性很好地描述了热激活形式,表明部分间隙开放的费米面低于T0。当压力施加到CeRu_2Al_(10)上时,T_0在3 ~ 4GPa之间突然消失,CeRu_2Al_(10)转变为近藤绝缘体,随后转变为金属。CeT 2Al 10在各自的压力下的相似性表明,通过一些参数控制这些化合物中不寻常的物理性质,存在一种标度关系。

英文摘要:

We have succeeded in growing single crystals of orthorhombic CeT2Al10 (T=Fe, Ru, Os) by Al self-flux method for the first time, and measured the electrical resistivity at pressures up to 8 GPa, the magnetic susceptibility and specific heat at ambient pressure. These results indicate that CeT2Al10 belongs to the heavy fermion compounds. CeRu2Al10 and CeOs2Al10 show a similar phase transition at T0 = 27.3 and 28.7 K, respectively. The temperature dependences in the ordered phases are well described by the thermally activated form, suggesting that partial gap opens over the Fermi surfaces below T0. When pressure is applied to CeRu2Al10, T0 disappears suddenly between 3 and 4 GPa, and CeRu2Al10 turns into a Kondo insulator, followed by a metal. The similarity of CeT2Al10 under respective pressures suggests a scaling relation by some parameter controlling the unusual physics in these compounds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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