Pressure dependence of the upper critical field of MgB2 and of YNi2B2C

Details Pressure dependence of the upper critical field of MgB2 and of YNi2B2C Pressure dependence of the upper critical field of MgB2 and of YNi2B2C

2004-12-02

arxiv.org/abs/cond-mat/0412042v1

PHYSICAL REVIEW B 70, 134518 (2004)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.70.134518

We present measurements of H$_{c2}(T)$ under pressure in MgB$_2$ and in YNi$_2$B$_2$C. The changes in the shape of H$_{c2}(T)$ are interpreted within current models and show the evolution of the main Fermi surface velocities $v_F$ and electron-phonon coupling parameters $\lambda$ with pressure. In MgB$_2$ the electron-phonon coupling strength of the nearly two dimensional $\sigma$ band, responsible for the high critical temperature, is more affected by pressure than the $\pi$ band coupling, and the hole doping of the $\sigma$ band decreases. In YNi$_2$B$_2$C, the peculiar positive curvature of H$_{c2}(T)$ is weakened by pressure.

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