Free flux flow resistivity in a strongly overdoped high-T c cuprate: The purely viscous motion of the vortices in a semiclassical d-wave superconductor
Free flux flow resistivity in a strongly overdoped high-T c cuprate: The purely viscous motion of the vortices in a semiclassical d-wave superconductor
复制标题
强过量掺杂高温铜酸盐中的自由通量流电阻率：半经典 d 波超导体中涡流的纯粘性运动
DOI：
10.1103/physrevb.66.014527
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发表时间：
2002
影响因子：
3.7
通讯作者：
Y. Kato
中科院分区：
文献类型：
--
作者：
Y. Matsuda;A. Shibata;K. Izawa;H. Ikuta;M. Hasegawa;Y. Kato
本文报道了中等清洁d波超导体Bi:2201在强过掺杂状态下（T c =16 K）在大范围磁场下涡旋状态下的自由通量流（FFF）电阻率与纯粘性涡旋运动的关系。FFF电阻率是通过测量不同微波频率下的微波表面阻抗得到的。发现FFF电阻率与常规s波超导体的电阻率有显著差异。在低场（H<0.2H c 2）下，FFF电阻率随H线性增加，其系数远远大于常规s波超导体。在较高的电场下，FFF电阻率随H的增大而增大，直至h2。在此基础上，讨论了带间隙节点的“半经典”d波超导体中粘性涡运动的能量耗散机制。对这些场依赖性提出了两种可能的情形：准粒子弛豫速率的增强和参与d波涡旋态能量耗散的准粒子数量的减少。
We report the free flux flow (FFF) resistivity associated with a purely viscous motion of the vortices in a moderately clean d-wave superconductor Bi:2201 in the strongly overdoped regime (T c =16 K) for a wide range of the magnetic field in the vortex state. The FFF resistivity is obtained by measuring the microwave surface impedance at different microwave frequencies. It is found that the FFF resistivity is remarkably different from that of conventional s-wave superconductors. At low fields (H<0.2H c 2 ) the FFF resistivity increases linearly with H with a coefficient which is far larger than that found in conventional s-wave super conductors. At higher fields, the FFF resistivity increases in proportion to H up to H c 2 . Based on these results, the energy dissipation mechanism associated with the viscous vortex motion in "semiclassical" d-wave superconductors with gap nodes is discussed. Two possible scenarios are put forth for these field dependences: the enhancement of the quasiparticle relaxation rate and the reduction of the number of the quasiparticles participating the energy dissipation in d-wave vortex state.