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Renormalization group analysis of magnetic and superconducting instabilities near van Hove band fillings

Renormalization group analysis of magnetic and superconducting instabilities near van Hove band... Phase diagrams of the two-dimensional one-band t - t ′ Hubbard model are obtained within the two-patch and temperature-cutoff many-patch renormalization group approaches. At small t ′ and at van Hove band fillings antiferromagnetism dominates, while with increasing t ′ or changing filling antiferromagnetism is replaced by d -wave superconductivity. Near t ′ = t / 2 and close to van Hove band fillings the system is unstable towards ferromagnetism. Away from van Hove band fillings this ferromagnetic instability is replaced by a region with dominating triplet p -wave superconducting correlations. The results of the renormalization-group approach are compared with the mean-field results and the results of the T -matrix approximation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Renormalization group analysis of magnetic and superconducting instabilities near van Hove band fillings

Katanin, A. A; Kampf, A. P
Physical Review B , Volume 68 (19) – Nov 15, 2003
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Publisher
American Physical Society (APS)
Copyright
Copyright © 2003 The American Physical Society
ISSN
1095-3795
DOI
10.1103/PhysRevB.68.195101
Publisher site
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Abstract

Phase diagrams of the two-dimensional one-band t - t ′ Hubbard model are obtained within the two-patch and temperature-cutoff many-patch renormalization group approaches. At small t ′ and at van Hove band fillings antiferromagnetism dominates, while with increasing t ′ or changing filling antiferromagnetism is replaced by d -wave superconductivity. Near t ′ = t / 2 and close to van Hove band fillings the system is unstable towards ferromagnetism. Away from van Hove band fillings this ferromagnetic instability is replaced by a region with dominating triplet p -wave superconducting correlations. The results of the renormalization-group approach are compared with the mean-field results and the results of the T -matrix approximation.

Journal

Physical Review B – American Physical Society (APS)

Published: Nov 15, 2003

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