Microscopic Evidence of Direct Coupling between Magnetic and Superconducting Order Parameters in BaFe2(As1-xPx)2
Microscopic Evidence of Direct Coupling between Magnetic and Superconducting Order Parameters in BaFe2(As1-xPx)2
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DOI：
10.1143/jpsj.81.033701
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发表时间：
2011-11
影响因子：
1.7
通讯作者：
T. Iye;Yusuke Nakai;S. Kitagawa;Kenji Ishida;S. Kasahara;T. Shibauchi;Yuji Matsuda;T. Terashima-T.-Teras
中科院分区：
文献类型：
--
作者：
T. Iye;Yusuke Nakai;S. Kitagawa;Kenji Ishida;S. Kasahara;T. Shibauchi;Yuji Matsuda;T. Terashima-T.-Teras
用31 P-NMR方法从微观上研究了等价磷取代BaFe 2（As 1-xPx）2的磁性和超导电性共存。发现超导转变发生在具有静态有序矩的磁性区域，并且在磁性和超导性相界附近的样品中，有序矩在超导转变温度Tc以下降低。我们的结果表明，磁性和超导性在空间上共存，但在同一费米表面上相互竞争。共存状态是定性的不同，从其他非常规超导体中观察到的，并给出了严格的约束理论模型的超导BaFe 2（As 1-xPx）2。
The coexistence of magnetism and superconductivity in the isovalent-P-substituted BaFe 2 (As 1- x P x ) 2 has been investigated microscopically by 31 P-NMR measurements. We found that superconducting (SC) transition occurs in a magnetic region with static ordered moments and that the moments are reduced below the SC transition temperature T c in the samples near the phase boundary of magnetism and superconductivity. Our results indicate that magnetism and superconductivity coexist spatially but compete with each other on the same Fermi surfaces. The coexistence state is qualitatively different from that observed in other unconventional superconductors and gives a strict constraint on the theoretical model for superconductivity in BaFe 2 (As 1- x P x ) 2 .