High-Frequency ac Susceptibility of Iron-Based Superconductors

被引：5

作者：

Ghigo, Gianluca ^{[1
,2
]}

Fracasso, Michela ^{[1
,2
]}

Gerbaldo, Roberto ^{[1
,2
]}

Gozzelino, Laura ^{[1
,2
]}

Laviano, Francesco ^{[1
,2
]}

Napolitano, Andrea ^{[1
,2
]}

Cao, Guang-Han ^{[3
]}

Graf, Michael J. ^{[4
]}

Prozorov, Ruslan ^{[5
,6
]}

Tamegai, Tsuyoshi ^{[7
]}

Shi, Zhixiang ^{[8
]}

Xing, Xiangzhuo ^{[9
]}

Torsello, Daniele ^{[1
,2
]}

机构：

[1] Politecn Torino, Dept Appl Sci & Technol, I-10129 Turin, Italy

[2] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

[3] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China

[4] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

[5] Ames Lab, Ames, IA 50011 USA

[6] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[7] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

[8] Southeast Univ, Sch Phys, Nanjing 211189, Peoples R China

[9] Qufu Normal Univ, Sch Phys & Phys Engn, Qufu 273165, Shandong, Peoples R China

来源：

MATERIALS | 2022年 / 15卷 / 03期

基金：

日本学术振兴会;

关键词：

iron-based superconductors; high-frequency AC susceptibility; microwave superconductivity; VORTEX; FIELD;

D O I：

10.3390/ma15031079

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A microwave technique suitable for investigating the AC magnetic susceptibility of small samples in the GHz frequency range is presented. The method-which is based on the use of a coplanar waveguide resonator, within the resonator perturbation approach-allows one to obtain the absolute value of the complex susceptibility, from which the penetration depth and the superfluid density can be determined. We report on the characterization of several iron-based superconducting systems, belonging to the 11, 122, 1144, and 12442 families. In particular, we show the effect of different kinds of doping for the 122 family, and the effect of proton irradiation in a 122 compound. Finally, the paradigmatic case of the magnetic superconductor EuP-122 is discussed, since it shows the emergence of both superconducting and ferromagnetic transitions, marked by clear features in both the real and imaginary parts of the AC susceptibility.

引用

页数：12

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