Pressure and isotope effect on the anisotropy of MgB$_{2}$

Details Pressure and isotope effect on the anisotropy of MgB$_{2}$ Pressure and isotope effect on the anisotropy of MgB$_{2}$

2005-02-08

arxiv.org/abs/cond-mat/0502202v1

Phys. Rev. B 72, 054501 (2005)

Physics

Condensed Matter

Superconductivity

7 pages, 3 figures

Scientific paper

10.1103/PhysRevB.72.054501

We analyze the data for the pressure and boron isotope effect on the temperature dependence of the magnetization near $T_{c}$. Invoking the universal scaling relation for the magnetization at fixed magnetic field it is shown that the relative shift of $T_{c}$, induced by pressure or boron isotope exchange, mirrors essentially that of the anisotropy. This uncovers a novel generic property of anisotropic type II superconductors, inexistent in the isotropic case. For MgB$_{2}$ it implies that the renormalization of the Fermi surface topology due to pressure or isotope exchange is dominated by a mechanism controlling the anisotropy.

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