Pressure induced softening of YB6: pressure effect on the Ginzburg-Landau parameter κ=λ/ξ
R. Khasanov, P. S. Häfliger, N. Shitsevalova, A. Dukhnenko, H. Keller
Abstract
Measurements of the transition temperature Tc, the second critical filed Hc2 and the magnetic penetration depth λunder hydrostatic pressure (up to 9.2 kbar) in the YB6 superconductor were carried out. A pronounced and negative pressure effects (PE) on Tc and Hc2 with dTc/dp=-0.0547(4) K/kbar and μ0dHc2(0)/dp =-4.84(20) mT/kbar, and zero PE on λ(0) were observed. The PE on the coherence length dξ(0)/dp=0.28(2) nm/kbar was calculated from the measured pressure dependence of Hc2(0). Together with the zero PE on the magnetic penetration depth λ(0), our results imply that the Ginzburg-Landau parameter κ(0)=ξ(0)/λ(0) depends on pressure and that pressure "softens" YB6, e.g. moves it to the type-I direction.
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