NDLI: Electronic structure and superconductivity of MgB$

Content Provider	Springer Nature Link
Author	Gaitonde, D. M. Modak, P. Rao, R. S. Godwal, B. K.
Copyright Year	2003
Abstract	Results of ab initio electronic structure calculations on the compound, MgB $_{2}$, using the FPLAPW method employing GGA for the exchange-correlation energy are presented. Total energy minimization enables us to estimate the equilibrium volume,c/a ratio and the bulk modulus, all of which are in excellent agreement with experiment. We obtain the mass enhancement parameter by using our calculated, D(E $_{F}$) and the experimental specific heat data. TheT $_{c}$ is found to be 37 K. We use a parametrized description of the calculated band structure to obtain the T =0 K values of the London penetration depth and the superconducting coherence length. The penetration depth calculated by us is too small and the coherence length too large as compared to the experimentally determined values of these quantities. This indicates the limitations of a theory that relies only on electronic structure calculations in describing the superconducting state in this material and implies that impurity effects as well as mass renormalization effects need to be included.
Starting Page	137
Ending Page	141
Page Count	5
File Format	PDF
ISSN	02504707
Journal	Bulletin of Materials Science
Volume Number	26
Issue Number	1
e-ISSN	09737669
Language	English
Publisher	Springer India
Publisher Date	2003-01-01
Publisher Institution	Indian Academy of Sciences
Publisher Place	New Delhi
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electronic structure superconductivity magnesium diboride coherence length London penetration depth Materials Science Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science

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