標題: Enhanced critical current density in the pressure-induced magnetic state of the high-temperature superconductor FeSe
作者: Jung, Soon-Gil
Kang, Ji-Hoon
Park, Eunsung
Lee, Sangyun
Lin, Jiunn-Yuan
Chareev, Dmitriy A.
Vasiliev, Alexander N.
Park, Tuson
物理研究所
Institute of Physics
公開日期: 9-Nov-2015
摘要: We investigate the relation of the critical current density (J(c)) and the remarkably increased superconducting transition temperature (T-c) for the FeSe single crystals under pressures up to 2.43 GPa, where the T-c is increased by similar to 8 K/GPa. The critical current density corresponding to the free flux flow is monotonically enhanced by pressure which is due to the increase in T-c, whereas the depinning critical current density at which the vortex starts to move is more influenced by the pressure-induced magnetic state compared to the increase of T-c. Unlike other high-T-c superconductors, FeSe is not magnetic, but superconducting at ambient pressure. Above a critical pressure where magnetic state is induced and coexists with superconductivity, the depinning Jc abruptly increases even though the increase of the zero-resistivity T-c is negligible, directly indicating that the flux pinning property compared to the T-c enhancement is a more crucial factor for an achievement of a large J(c). In addition, the sharp increase in J(c) in the coexisting superconducting phase of FeSe demonstrates that vortices can be effectively trapped by the competing antiferromagnetic order, even though its antagonistic nature against superconductivity is well documented. These results provide new guidance toward technological applications of high-temperature superconductors.
URI: http://dx.doi.org/10.1038/srep16385
http://hdl.handle.net/11536/128374
ISSN: 2045-2322
DOI: 10.1038/srep16385
期刊: SCIENTIFIC REPORTS
Volume: 5
起始頁: 0
結束頁: 0
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