Determination of the coordinate dependence of a pinning potential from the microwave experiment with vortices

Автор(и)

  • V.A. Shklovskij Institute of Theoretical Physics, NSC-KIPT, Kharkiv 61108, Ukraine
  • O.V. Dobrovolskiy Physikalisches Institut, Goethe-University, Frankfurt am Main 60438, Germany

DOI:

https://doi.org/10.1063/1.4791773

Ключові слова:

microwave power absorption, pinning potential, Abrikosov vortices.

Анотація

The measurement of the complex impedance response and accompanied power absorption P(ω) in the radiofrequency and microwave ranges represents a most popular experimental method to investigate pinning mechanisms and the vortex dynamics in type-II superconductors. In the theory, the pinning potential (PP) well for a vortex must be a priori specified in order to subsequently analyze the measured data. We have theoretically solved the inverse problem at T = 0 K and exemplify how the coordinate dependence of a PP can be determined from a set of experimental curves P(ω|j0) measured at subcritical dc currents 0 < j0 < jc under a small microwave excitation j1 << jc with frequency ω. We furthermore elucidate how and why the depinning frequency ωp, which separates the non-dissipative (quasi-adiabatic) and the dissipative (high-frequency) regimes of small vortex oscillations in the PP, is reduced with the increase of j0. The results can be directly applied to a wide range of conventional superconductors with a PP subjected to superimposed dc and small microwave ac currents at T << Tc.

Завантаження

Дані завантаження ще не доступні.

Downloads

Опубліковано

2012-12-17

Як цитувати

(1)
Shklovskij, V.; Dobrovolskiy, O. Determination of the Coordinate Dependence of a Pinning Potential from the Microwave Experiment With Vortices. Fiz. Nizk. Temp. 2012, 39, 162-167.

Номер

Розділ

Надпровідність, зокрема високотемпературна

Статті цього автора (авторів), які найбільше читають