Pressure induced softening of YB_6: pressure effect on the Ginzburg-Landau parameter κ=λ/ξ

Details Pressure induced softening of YB_6: pressure effect on the Ginzburg-Landau parameter κ=λ/ξ Pressure induced softening of YB_6: pressure effect on the Ginzburg-Landau parameter κ=λ/ξ

2006-05-15

arxiv.org/abs/cond-mat/0605391v1

Phys. Rev. Lett. 97, 157002 (2006)

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.97.157002

Measurements of the transition temperature T_c, the second critical filed H_{c2} and the magnetic penetration depth \lambda under hydrostatic pressure (up to 9.2 kbar) in the YB_6 superconductor were carried out. A pronounced and {\it negative} pressure effects (PE) on T_c and H_{c2} with dT_c/dp=-0.0547(4) K/kbar and \mu_0dH_{c2}(0)/dp =-4.84(20) mT/kbar, and zero PE on \lambda(0) were observed. The PE on the coherence length d\xi(0)/dp=0.28(2) nm/kbar was calculated from the measured pressure dependence of H_{c2}(0). Together with the zero PE on the magnetic penetration depth \lambda(0), our results imply that the Ginzburg-Landau parameter \kappa(0)=\xi(0)/\lambda(0) depends on pressure and that pressure "softens" YB_6, e.g. moves it to the type-I direction.

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