Electron irradiation of Co, Ni, and P-doped BaFe2As2_type iron-based superconductors

10th International Conference on Materials and Mechanisms of Superconductivity

Van Der Beek, Cornelis Jacominus^1 ; Demirdis¸, Sultan^1 ; Colson, Dorothée^2 ; Rullier-Albenque, Florence^2 ; Fasano, Yanina^3 ; Shibauchi, Takasada^4 ; Matsuda, Yuji^4 ; Kasahara, Shigeru^4,5 ; Gierlowski, Piotr^6 ; Konczykowski, Marcin^1

Laboratoire des Solides Irradiés, CNRS UMR 7642, Ecole Polytechnique, F-91128 Palaiseau cedex, France^1

Service de Physique de l'Etat Condensé, CEA Saclay, CNRS URA 2464, F-91191 Gif-sur-Yvette, France^2

Laboratorio de Bajas Temperaturas, Centro Atómico Bariloche and Instituto Balseiro, Avenida Bustillo 9500, 8400 San Carlos de Bariloche, Argentina^3

Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan^4

Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan^5

Institute of Physics, Polish Academy of Sciences, 32-46 Aleja Lotników, 02-668 Warsaw, Poland^6

关键词: Critical temperatures;    High-energy electron irradiation;    Order parameter;    Pinning contribution;    Quasi particles;    Single-crystalline;    Superfluid density;    Temperature dependence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/449/1/012023/pdf
DOI  :  10.1088/1742-6596/449/1/012023

来源: IOP

【 摘 要 】

High energy electron irradiation is used to controllably introduce atomic-scale point defects into single crystalline Ba(Fe1-xCox)2As2, Ba(Fe1-xNix)2As2, and BaFe2(As1-xPx)2. The appearance of the collective pinning contribution to the critical current density in BaFe2(As1-xPx)2, and the magnitude of its enhancement in Ba(Fe1-xCox)2As2, conform with the hypothesis of quasi-particle scattering by Fe vacancies created by the irradiation. Whereas the insignificant modification of the temperature dependence of the superfluid density in Ba(Fe1-xCox)2As2 and Ba(Fe1-xNix)2As2 points to important native disorder present before the irradiation, the critical temperatures of these materials undergo a suppression equivalent to that observed in the much cleaner BaFe2(As1-xPx)2. This lends credence to the hypothesis of line nodes of the order parameter (at finite kz) in the former two materials.