Coulomb enhancement of superconducting pair-pair correlations in a 3 4 -filled model for κ − ( BEDT-TTF ) 2 X

Persistent Link:
http://hdl.handle.net/10150/614948
Title:
Coulomb enhancement of superconducting pair-pair correlations in a 3 4 -filled model for κ − ( BEDT-TTF ) 2 X
Author:
De Silva, W. Wasanthi; Gomes, N.; Mazumdar, S.; Clay, R. T.
Affiliation:
Univ Arizona, Dept Phys
Issue Date:
2016-05-09
Publisher:
AMER PHYSICAL SOC
Citation:
Coulomb enhancement of superconducting pair-pair correlations in a 3 4 -filled model for κ − ( BEDT-TTF ) 2 X 2016, 93 (20) Physical Review B
Journal:
Physical Review B
Rights:
©2016 American Physical Society.
Collection Information:
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
Abstract:
We present the results of precise correlated-electron calculations on the monomer lattices of the organic charge-transfer solids kappa-(BEDT-TTF)(2)X for 32 and 64 molecular sites. Our calculations are for band parameters corresponding to X = Cu[N(CN)(2)]Cl and Cu-2(CN)(3), which are semiconducting antiferromagnetic and quantum spin liquid, respectively, at ambient pressure. We have performed our calculations for variable electron densities. per BEDT-TTF molecule, with. ranging from 1 to 2. We find that d-wave superconducting pair-pair correlations are enhanced by electron-electron interactions only for a narrow carrier concentration about rho = 1.5, which is precisely the carrier concentration where superconductivity in the charge-transfer solids occurs. Our results indicate that the enhancement in pair-pair correlations is not related to antiferromagnetic order, but to a proximate hidden spin-singlet state that manifests itself as a charge-ordered state in other charge-transfer solids. Long-range superconducting order does not appear to be present in the purely electronic model, suggesting that electronphonon interactions also must play a role in a complete theory of superconductivity.
ISSN:
2469-9950; 2469-9969
DOI:
10.1103/PhysRevB.93.205111
Version:
Final published version
Additional Links:
http://link.aps.org/doi/10.1103/PhysRevB.93.205111

Full metadata record

DC FieldValue Language
dc.contributor.authorDe Silva, W. Wasanthien
dc.contributor.authorGomes, N.en
dc.contributor.authorMazumdar, S.en
dc.contributor.authorClay, R. T.en
dc.date.accessioned2016-06-29T00:26:30Z-
dc.date.available2016-06-29T00:26:30Z-
dc.date.issued2016-05-09-
dc.identifier.citationCoulomb enhancement of superconducting pair-pair correlations in a 3 4 -filled model for κ − ( BEDT-TTF ) 2 X 2016, 93 (20) Physical Review Ben
dc.identifier.issn2469-9950-
dc.identifier.issn2469-9969-
dc.identifier.doi10.1103/PhysRevB.93.205111-
dc.identifier.urihttp://hdl.handle.net/10150/614948-
dc.description.abstractWe present the results of precise correlated-electron calculations on the monomer lattices of the organic charge-transfer solids kappa-(BEDT-TTF)(2)X for 32 and 64 molecular sites. Our calculations are for band parameters corresponding to X = Cu[N(CN)(2)]Cl and Cu-2(CN)(3), which are semiconducting antiferromagnetic and quantum spin liquid, respectively, at ambient pressure. We have performed our calculations for variable electron densities. per BEDT-TTF molecule, with. ranging from 1 to 2. We find that d-wave superconducting pair-pair correlations are enhanced by electron-electron interactions only for a narrow carrier concentration about rho = 1.5, which is precisely the carrier concentration where superconductivity in the charge-transfer solids occurs. Our results indicate that the enhancement in pair-pair correlations is not related to antiferromagnetic order, but to a proximate hidden spin-singlet state that manifests itself as a charge-ordered state in other charge-transfer solids. Long-range superconducting order does not appear to be present in the purely electronic model, suggesting that electronphonon interactions also must play a role in a complete theory of superconductivity.en
dc.language.isoenen
dc.publisherAMER PHYSICAL SOCen
dc.relation.urlhttp://link.aps.org/doi/10.1103/PhysRevB.93.205111en
dc.rights©2016 American Physical Society.en
dc.titleCoulomb enhancement of superconducting pair-pair correlations in a 3 4 -filled model for κ − ( BEDT-TTF ) 2 Xen
dc.typeArticleen
dc.contributor.departmentUniv Arizona, Dept Physen
dc.identifier.journalPhysical Review Ben
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
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