Gauge approach to the specific heat in the normal state of cuprates
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Dipartimento di Fisica 'G. Galilei', INFN, University of Padova, I-35131 Padova (Italy)
Many experimental features of the electronic specific heat and entropy of high-T{sub c} cuprates in the normal state, including the nontrivial temperature dependence of the specific-heat coefficient {gamma} and the negative intercept of the extrapolated entropy to T=0 for underdoped cuprates, are reproduced using the spin-charge gauge approach to the t-J model. The entropy turns out to be basically due to fermionic excitations but with a temperature dependence of the specific-heat coefficient controlled by fluctuations of a gauge field coupling them to gapful bosonic excitations. In particular the negative intercept of the extrapolated entropy at T=0 in the pseudogap 'phase' is attributed to the scalar component of the gauge field, which implements the local no-double occupancy constraint.
- OSTI ID:
- 21143630
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 8 Vol. 78; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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