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We present measurements of H$_{c2}(T)$ under pressure in MgB$_2$ and inYNi$_2$B$_2$C. The changes in the shape of H$_{c2}(T)$ are interpreted withincurrent models and show the evolution of the main Fermi surface velocities$v_F$ and electron-phonon coupling parameters $\lambda$ with pressure. InMgB$_2$ the electron-phonon coupling strength of the nearly two dimensional$\sigma$ band, responsible for the high critical temperature, is more affectedby 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 ofH$_{c2}(T)$ is weakened by pressure.Comment: 5 pages, 5 figure

physical review. b, condensed matter and materials physics

Pressure dependence of the upper critical field of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Mg</mml:mi><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>and of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Y</mml:mi><mml:msub><mml:mi mathvariant="normal">Ni</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi…

Pressure dependence of the upper critical field ofMgB2and ofYNi2