TY - JOUR
T1 - Microwave Conductivity in Two-Band Superconductors V3+x Si1−x
AU - Dolgov, O.V.
AU - Golubov, Alexandre Avraamovitch
AU - Nefyodov, Y.A.
AU - Shuvaev, A. M.
AU - Trunin, M.R.
PY - 2015
Y1 - 2015
N2 - We present the results of investigations of the temperature dependences of complex conductivity σ(T) = σ ′(T)−i σ ″(T) at frequency 9.4 GHz in series of single crystals V3+x Si1−x with different Si content. The data exhibit peculiarities typical for multiband superconductors, namely a nonlinear temperature dependence of resistivity above superconducting transition temperature T c , suppression of superconducting transition temperature T c by nonmagnetic impurities, a positive curvature of σ ″(T) curves close to T c , and a coherence peak in σ ′(T) at T∼T c /2. Using a two-band model in the weak-coupling regime, we demonstrate that the behavior of T c and the evolution of σ(T) with Si-content variation are consistently described by changing of the interband scattering rate.
AB - We present the results of investigations of the temperature dependences of complex conductivity σ(T) = σ ′(T)−i σ ″(T) at frequency 9.4 GHz in series of single crystals V3+x Si1−x with different Si content. The data exhibit peculiarities typical for multiband superconductors, namely a nonlinear temperature dependence of resistivity above superconducting transition temperature T c , suppression of superconducting transition temperature T c by nonmagnetic impurities, a positive curvature of σ ″(T) curves close to T c , and a coherence peak in σ ′(T) at T∼T c /2. Using a two-band model in the weak-coupling regime, we demonstrate that the behavior of T c and the evolution of σ(T) with Si-content variation are consistently described by changing of the interband scattering rate.
KW - IR-93520
KW - METIS-307821
U2 - 10.1007/s10948-014-2700-3
DO - 10.1007/s10948-014-2700-3
M3 - Article
VL - 28
SP - 331
EP - 337
JO - Journal of superconductivity and novel magnetism
JF - Journal of superconductivity and novel magnetism
SN - 1557-1939
IS - 2
ER -