Magnetic fluctuations under pressure on S-doped FeSe studied via 77Se NMR
Magnetic fluctuations under pressure on S-doped FeSe studied via 77Se NMR
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DOI：
10.1063/1.5042570
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发表时间：
2018-08
期刊：
影响因子：
1.6
通讯作者：
T. Kuwayama;K. Matsuura;Y. Mizukami;S. Kasahara;Y. Matsuda;T. Shibauchi;Y. Uwatoko;N. Fujiwara
中科院分区：
文献类型：
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作者：
T. Kuwayama;K. Matsuura;Y. Mizukami;S. Kasahara;Y. Matsuda;T. Shibauchi;Y. Uwatoko;N. Fujiwara
FeSe_（1-x）S_x是铁基超导体中最受关注的一类，因为它可以在无磁性的情况下实现超导和非超导相变。一个压力诱导的反铁磁（AFM）相出现后，施加压力。在压力（P）-温度（T）相图中，在3.0GPa左右，AFM相从SiO2相中分离，SC转变温度（Tc）达到最大值（~ 30 K）。我们在3.0 GPa下测量了12%-S掺杂的FeSe的77 Se的T1。我们发现，从1/T1 T，低能量的AFM波动没有那么多的压力下相比，在环境压力下的增强。结果表明，在加压过程中费米面的拓扑结构和嵌套的变化。
FeSe1-xSx has attracted much attention among iron-based superconductors because the pure sample undergoes nematic and superconducting (SC) phase transitions without magnetism. A pressure-induced antiferromagnetic (AFM) phase emerges upon applying pressure. In the pressure (P)-temperature (T) phase diagram for the 12%-S doped sample, the AFM phase is separated from the nematic phase at around 3.0 GPa, and SC transition temperature (Tc) takes a maximum (∼30 K). We measured T1 of 77Se for the 12%-S doped FeSe at 3.0 GPa. We found from 1/T1T that low-energy AFM fluctuations are not so much enhanced under pressure compared with those at ambient pressure. The result suggests changes of topology and nesting of Fermi surfaces during pressurizing process.