Comment on “Anisotropic s-wave superconductivity: Comparison with experiments on ” by A. I. Posazhennikova et al.

T. M. Mishonov; E. S. Penev; J. O. Indekeu

doi:10.1209/epl/i2003-00169-0

All issues

Volume 61 / No 4 (February 2003)

Europhys. Lett., 61 4 (2003) 577-578

Abstract

Issue		Europhys. Lett. Volume 61, Number 4, February 2003


Page(s)		577 - 578
Section		Interdisciplinary physics and related areas of science and technology
DOI		https://doi.org/10.1209/epl/i2003-00169-0
Published online		01 February 2003

Europhys. Lett., 61 (4), pp. 577-578 (2003)

Comment on “Anisotropic s-wave superconductivity: Comparison with experiments on $\chem{MgB_2}$ ” by A. I. Posazhennikova et al.

T. M. Mishonov¹^,2, E. S. Penev² and J. O. Indekeu¹

¹ Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven Celestijnenlaan 200 D, B-3001 Leuven, Belgium
² Department of Theoretical Physics, Faculty of Physics, Sofia University “St. Kliment Ohridski” - 5 J. Bourchier Blvd., Bg-1164 Sofia, Bulgaria

Received: 12 August 2002
Accepted: 13 December 2002

Abstract

An analytical result for the renormalization of the jump of the heat capacity $\Delta C/C_{\ab{N}}$ by the anisotropy of the order parameter is derived within the framework of the very recent model proposed by Posazhennikova, Dahm and Maki (Europhys. Lett., 60 (2002) 134), for both oblate and prolate anisotropy. The graph of $\Delta C/C_{\ab{N}}$ vs. the ratio of the gaps on the equator and the pole of the Fermi surface, $\Delta_{\ab{e}}/\Delta_{\ab{p}}$ , allows a direct determination of the gap anisotropy parameter $\Delta_{\ab{e}}/\Delta_{\ab{p}}$ by fitting data from specific-heat measurements $\Delta C/C_{\ab{N}}$ . Using the experimental value $\Delta C/C_{\ab{N}}=0.82\pm 10\%$ by Wang, Plackowski, and Junod (Physica C 355 (2001) 179) we find $\Delta_{\ab{e}}/\Delta_{\ab{p}}\approx 4.0$ .

PACS: 74.20.Rp – Pairing symmetries (other than s-wave) / 74.25.Bt – Thermodynamic properties / 74.70.-b – Superconducting materials (excluding high- $T_{\ab{c}}$ compounds)

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