Anomalous Surface Impedance in Reentrant Ferromagnetic Superconductors

Authors

C. Y. Huang, Los Alamos National Laboratory
C. E. Olsen, Los Alamos National Laboratory
Gregory Kozlowski, Wright State University - Main CampusFollow
H. Matsumoto, University of Alberta
H. Umezawa, University of Alberta
F. Mancini, Instituto di Fisica
M. B. Maple, University of California, San Diego
H. C. Hamaker, University of California, San Diego
M. S. Torikachvili, University of California, San Diego
J. P. Whitehead, Memorial University of Newfoundland
F. E. Wang, Innovative Technology International, Inc.

Document Type

Article

Publication Date

1985

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Abstract

We report evidence which suggests surface ferromagnetism in a ferromagnetic superconductor arising from the competition between the Meissner current shielding effect and the fluctuations of the localized magnetic moments. We have measured the surface impedance penetration depth Λ of ErRh4B4 and Er0.5Ho0.5Rh4B4 by employing a spectrometer operated at 9 GHz. For ErRh4B4, owing to the critical spin fluctuations just above Ts (>Tc2), the critical temperature at which surface ferromagnetism appears, Λ−1 decreases smoothly as temperature decreases toward Ts. For Er0.5Ho0.5Rh4B4, the decrease of Λ−1 arising from spin fluctuations for T>Tc2 is very small, and Λ−1 decreases abruptly at Tc2. We will discuss the theory and show how the predicted values of Λ(T) compare well with the observed values.

Repository Citation

Huang, C. Y., Olsen, C. E., Kozlowski, G., Matsumoto, H., Umezawa, H., Mancini, F., Maple, M. B., Hamaker, H. C., Torikachvili, M. S., Whitehead, J. P., & Wang, F. E. (1985). Anomalous Surface Impedance in Reentrant Ferromagnetic Superconductors. Journal of Applied Physics, 57 (8), 3104-3106.
https://corescholar.libraries.wright.edu/physics/1600

DOI

10.1063/1.335172