High-Frequency ac Susceptibility of Iron-Based Superconductors

Materials

Ruslan Prozorov¹  Tsuyoshi Tamegai²  Francesco Laviano³  Andrea Napolitano³  Roberto Gerbaldo³  Laura Gozzelino³  Michela Fracasso³  Daniele Torsello³  Gianluca Ghigo³  Michael J. Graf⁴  Guang-Han Cao⁵  Xiangzhuo Xing⁶  Zhixiang Shi⁷ 

[1] Ames Laboratory, Ames, IA 50011, USA;Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;Department of Applied Science and Technology, Politecnico di Torino, 10129 Torino, Italy;Department of Physics, Boston College, Chestnut Hill, MA 02467, USA;Department of Physics, Zhejiang University, Hangzhou 310027, China;School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China;School of Physics, Southeast University, Nanjing 211189, China;

关键词: iron-based superconductors;    high-frequency AC susceptibility;    microwave superconductivity;   

DOI  :  10.3390/ma15031079

来源: DOAJ

【 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.

【 授权许可】

Unknown