Temperature dependent anisotropy of the penetration depth and coherence length in MgB$_2

Details Temperature dependent anisotropy of the penetration depth and coherence length in MgB$_2 Temperature dependent anisotropy of the penetration depth and coherence length in MgB$_2

2005-01-18

arxiv.org/abs/cond-mat/0501415v2

Phys. Rev. Lett 95, 097005 (2005)

Physics

Condensed Matter

Superconductivity

4 pages with figures (New version)

Scientific paper

10.1103/PhysRevLett.95.097005

We report measurements of the temperature dependent anisotropies ($\gamma_\lambda$ and $\gamma_\xi$) of both the London penetration depth $\lambda$ and the upper critical field of MgB$_2$. Data for $\gamma_\lambda=\lambda_c/\lambda_a$ was obtained from measurements of $\lambda_{a}$ and $\lambda_c$ on a single crystal sample using a tunnel diode oscillator technique. $\gamma_\xi=H_{c2}^{\parallel c}/H_{c2}^{\bot c}$ was deduced from field dependent specific heat measurements on the same sample. $\gamma_\lambda$ and $\gamma_\xi$ have opposite temperature dependencies, but close to $T_c$ tend to a common value ($\gamma_\lambda\simeq \gamma_\xi=1.75\pm0.05$). These results are in good agreement with theories accounting for the two gap nature of MgB$_2$

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