Effects of heavy-ion irradiation on the microwave surface impedance of (Ba1-xKx)Fe2As2 single crystals

被引：16

作者：

Ghigo, G. ^{[1
,2
]}

Torsello, D. ^{[1
,2
]}

Gerbaldo, R. ^{[1
,2
]}

Gozzelino, L. ^{[1
,2
]}

Laviano, F. ^{[1
,2
]}

Tamegai, T. ^{[3
]}

机构：

[1] Politecn Torino, Dept Appl Sci & Technol, Turin, Italy

[2] Ist Nazl Fis Nucl, Sez Torino, Turin, Italy

[3] Univ Tokyo, Dept Appl Phys, Tokyo, Japan

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2018年 / 31卷 / 03期

关键词：

iron-based superconductors; heavy-ion irradiation; microwave surface impedance; PARTICLE;

D O I：

10.1088/1361-6668/aaa858

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The electrodynamic response of Ba1-xKxFe2As2 single crystals at the microwave frequencies has been investigated by means of a coplanar resonator technique, at different values of non-magnetic disorder introduced into the samples by heavy-ion irradiation. The surface impedance Z(s) = R-s + iX(s) conforms to the classical skin effect above the critical temperature. Below T-c, R-s monotonically decreases while X-s shows a peak, which evolves as a function of the irradiation fluence. The disorder-dependent Z(s)(T) curves are analyzed within a two-fluid model, suitably modified to account for a finite quasiparticle fraction at T = 0. The analysis gives, for the unirradiated crystal, quasiparticle relaxation times tau that are in good agreement with previous literature. Smaller tau values are deduced for the disordered crystals, both in the normal and in the superconducting states. The limits of application of the model are discussed.

引用

页数：6

共 32 条

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