Effect of electron correlation on superconducting pairing symmetry |
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Authors: | M Mitra H Ghosh SN Behera |
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Institution: | (1) Institute of Physics, Sachivalaya Marg, Bhubaneswar 751 005, India, IN;(2) Instituto de Física, Universidade Federal Fluminense, Campus da praia Vermelha, Av. Litoranea s/n, 24210-340 Niterói Rio de Janeiro, Brazil, BR |
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Abstract: | The role of electron correlation on different pairing symmetries are discussed in details where the electron correlation has
been treated within the slave boson formalism. It is shown that for a pure s or pure d wave pairing symmetry, the electronic
correlation suppresses the s wave gap magnitude (as well as the ) at a faster rate than that for the d wave gap. On the other hand, a complex order parameter of the form () shows anomalous temperature dependence. For example, if the temperature () at which the d wave component of the complex order parameter vanishes happens to be larger than that for the s wave component
(), then the growth of the d wave component is arrested with the onset of the s wave component of the order parameter. In this
mixed phase however, we find that the suppression in different components of the gap as well as the corresponding due to coulomb correlation are very sensitive to the relative pairing strengths of s and d channels as well as the underlying
lattice. Interestingly enough, in such a scenario (for a case of )the gap magnitude of the d wave component increases with electron correlation but not for certain values of electron correlation. However, this never happens in case of the s wave component. We also calculate
the temperature dependence of the superconducting gap along both the high symmetry directions ( and ) in a mixed symmetry pairing state and the thermal variation of the gap anisotropy 0pt]0pt] with electron correlation. The results
are discussed with reference to experimental observations.
Received: 26 August 1997 / Revised: 31 December 1997 /
Accepted: 28 January 1998 |
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Keywords: | PACS 74 25 Dw Superconductivity phase diagrams - 74 62 -c Transition temperature variations - 74 20 Fg BCS theory and its development |
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