Fluctuation conductivity and vortex state in a superconductor with strong paramagnetic pair breakingｇ
Fluctuation conductivity and vortex state in a superconductor with strong paramagnetic pair breakingｇ
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强顺磁对破断超导体中的涨落电导率和涡旋态
DOI：
10.1103/physrevb.105.174510
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Ryusuke Ikeda
中科院分区：
文献类型：
--
作者：
Naratip Nunchot;Dai Nakashima;Ryusuke Ikeda
研究了具有强泡利顺磁对破缺（PPB）的中等清洁II型超导体在低温和强磁场下的量子态波动电导率。首先，指出随着PPB效应的增强，量子超导涨落通常会增强，使得重归一化Aslamasov-Larkin （AL）涨落电导率在冷却到不可逆线以上时趋于消失。此外，通过检查波动电导率的其他[DOS和Maki-Thompson (MT)]项，发现所得到的总电导率的场依赖性很大程度上取决于低温下强PPB起重要作用的涡晶格（或玻璃）有序态的类型。通过对硒化铁（FeSe）在进入ppb诱导的新型SC相时的波动电导率、绝缘和负磁阻行为的比较，认为在高场和低温的平行场构型下，硒化铁（FeSe）在第二低朗道能级上实现了超导序参量的涡旋态。
The fluctuation conductivity of a moderately clean type II superconductor with strong Pauli paramagnetic pair breaking (PPB) is studied by focusing on the quantum regime at low temperatures and in high magnetic fields. First, it is pointed out that, as the PPB effect becomes stronger, the quantum superconducting fluctuation is generally enhanced so that the renormalized Aslamasov-Larkin (AL) fluctuation conductivity tends tovanishupon cooling above the irreversibility line. Furthermore, by examining other [the DOS and the Maki-Thompson (MT)] terms of the fluctuation conductivity, the field dependence of the resulting total conductivity is found to depend significantly on the type of the vortex lattice (or, glass) ordered state at low temperatures where the strong PPB plays important roles. By comparing the present results on the fluctuation conductivity with insulating and negative magnetoresistance behaviors seen upon entering a PPB-induced novel SC phase of iron selenide (FeSe), it is argued that the vortex matter states of the superconducting order parameter in the second lowestLandau level are realized in FeSe in the parallel field configuration in high fields and at low temperatures.