EuFe2As2 under High Pressure: An Antiferromagnetic Bulk Superconductor
EuFe2As2 under High Pressure: An Antiferromagnetic Bulk Superconductor
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DOI：
10.1143/jpsj.78.083701
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发表时间：
2009-04
影响因子：
1.7
通讯作者：
T. Terashima;M. Kimata;H. Satsukawa;A. Harada;K. Hazama;S. Uji;H. Suzuki;Takehiko Matsumoto;K. Murata
中科院分区：
文献类型：
--
作者：
T. Terashima;M. Kimata;H. Satsukawa;A. Harada;K. Hazama;S. Uji;H. Suzuki;Takehiko Matsumoto;K. Murata
本文报道了高压P下EuFe2As2的交流磁化率χ ac和电阻率ρ的测量结果.通过在P = 28kbar下观察到近100%的超导屏蔽和零电阻率，我们确定EuFe2As2在Tc = 30K时发生P诱导超导。在相同的P下，从室温到Tc，ρ表现出反常的近似线性的温度依赖关系。χ ac表明，在超导相中，Eu2+磁矩仍保持反铁磁序，T N = 20 K.上临界场的温度依赖性也被确定。
We report the ac magnetic susceptibility χ ac and resistivity ρ measurements of EuFe 2 As 2 under high pressure P . By observing nearly 100% superconducting shielding and zero resistivity at P =28 kbar, we establish that P -induced superconductivity occurs at T c ∼30 K in EuFe 2 As 2 . ρ shows an anomalous nearly linear temperature dependence from room temperature down to T c at the same P . χ ac indicates that an antiferromagnetic order of Eu 2+ moments with T N ∼20 K persists in the superconducting phase. The temperature dependence of the upper critical field is also determined.