Superconductivity in the Ferroquadrupolar State in the Quadrupolar Kondo Lattice PrTi2Al20
Superconductivity in the Ferroquadrupolar State in the Quadrupolar Kondo Lattice PrTi2Al20
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四极近藤晶格 PrTi2Al20 中铁四极态的超导
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
S. Nakatsuji
中科院分区：
文献类型：
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作者：
A. Sakai;K. Kuga;S. Nakatsuji
PrTi 2Al 20是一个四极Kondo晶格系统，由于非Kramers Γ 3基态二重态的存在，呈现出四极有序性，并在4f和传导电子之间有很强的杂化.我们的研究表明，使用高纯度的单晶PrTi 2Al 20显示II型超导性在Tc = 200 mK的双铁四极态。超导临界温度和场相图表明干净的极限超导性与适度增强的有效质量m * /m0 <$16。
The cubic compound PrTi 2 Al 20 is a quadrupolar Kondo lattice system that exhibits quadrupolar ordering due to the non-Kramers Γ 3 ground doublet and has strong hybridization between 4 f and conduction electrons. Our study using high-purity single crystals reveals that PrTi 2 Al 20 exhibits type-II superconductivity at T c = 200 mK in the nonmagnetic ferroquadrupolar state. The superconducting critical temperature and field phase diagram indicates clean limit superconductivity with moderately enhanced effective mass of m * / m 0 ∼16.