Baskaran, G. (2008) Resonating valence bond mechanism of impurity band superconductivity in diamond Journal of Superconductivity and Novel Magnetism, 21 (1). pp. 45-49. ISSN 1557-1939
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Official URL: http://www.springerlink.com/content/h43x5121731245...
Related URL: http://dx.doi.org/10.1007/s10948-007-0295-7
Abstract
Superconductivity in an uncompensated boron doped diamond, a very recent observation, is strikingly close to an earlier observation of Anderson-Mott insulator to metal transition, prompting us to suggest an electron correlation driven superconductivity in an impurity band. Random coulomb potential remove a three fold orbital degeneracy of boron acceptor states, resulting in an effective single, narrow, tight binding and half-filled band of holes. Singlet coupling between spins of neighboring neutral acceptors B0-B0 is the seed of pairing. Across the insulator to metal transition, a small and equal fraction of charged B+ and B- states (free carriers) get spontaneously generated and delocalize. Thereupon neutral singlets resonate and get charged resulting in a resonating valence bond (RVB) superconducting state.
Item Type: | Article |
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Source: | Copyright of this article belongs to Springer-Verlag. |
ID Code: | 1871 |
Deposited On: | 08 Oct 2010 12:30 |
Last Modified: | 16 May 2016 12:55 |
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