Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe.
Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe.
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FeSe 中穹顶形磁序与高压下的高温超导性竞争
DOI：
10.1038/ncomms12146
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发表时间：
2016-07-19
影响因子：
16.6
通讯作者：
Shibauchi T
中科院分区：
文献类型：
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作者：
Sun JP;Matsuura K;Ye GZ;Mizukami Y;Shimozawa M;Matsubayashi K;Yamashita M;Watashige T;Kasahara S;Matsuda Y;Yan JQ;Sales BC;Uwatoko Y;Cheng JG;Shibauchi T
超导性与电子序（如自旋或电荷密度波）之间的共存和竞争一直是高温超导体研究的核心问题。与其他铁基超导体不同，FeSe在没有磁性的情况下表现出向列有序，其与超导性的关系尚不清楚。此外，据报道，压力引起的tchas增加了四倍，这构成了一个深刻的谜团。在这里，我们报道了在FeSe中高达~ 15 GPa的高压磁输运测量，发现磁相的圆顶形状取代了向列序。在~ 6 GPa以上，超导性的突然增强（Tc≤38.3 K）伴随着磁序的抑制，表明它们在非常相似的能量尺度下具有竞争性质。在磁穹之上，我们发现异常输运性质表明可能存在赝隙形成，而在高于6 GPa的高相正常状态下观察到线性温度电阻率。获得的相图突出了铁基超导体中FeSe的独特特征，但与高铜酸盐有一些相似之处。
The coexistence and competition between superconductivity and electronic orders, such as spin or charge density waves, have been a central issue in high transition-temperature (Tc) superconductors. Unlike other iron-based superconductors, FeSe exhibits nematic ordering without magnetism whose relationship with its superconductivity remains unclear. Moreover, a pressure-induced fourfold increase ofTchas been reported, which poses a profound mystery. Here we report high-pressure magnetotransport measurements in FeSe up to ∼15 GPa, which uncover the dome shape of magnetic phase superseding the nematic order. Above ∼6 GPa the sudden enhancement of superconductivity (Tc≤38.3 K) accompanies a suppression of magnetic order, demonstrating their competing nature with very similar energy scales. Above the magnetic dome, we find anomalous transport properties suggesting a possible pseudogap formation, whereas linear-in-temperature resistivity is observed in the normal states of the high-Tcphase above 6 GPa. The obtained phase diagram highlights unique features of FeSe among iron-based superconductors, but bears some resemblance to that of high-Tccuprates.