Pairing Strengths for a Two Orbital Model of the Fe-pnictides

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Using an RPA approximation, we have calculated the strengths of the singlet and triplet pairing interactions which arise from the exchange of spin and orbital fluctuations for a 2-orbital model of the Fe-pnictide superconductors. When the system is doped with F, the electron pockets become dominant and we find that the strongest pairing occurs in the singlet d-wave pairing and the triplet p-wave pairing channels, which compete closely. The pairing structure in the singlet d-wave channel corresponds to a superposition of near neighbor intra-orbital singlets with a minus sign phase difference between the d{sub xz} and d{sub yz} pairs. The ... continued below

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6 pages

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Qi, Xiao-Liang; Raghu, S.; /Stanford U., Phys. Dept.; Liu, Chao-Xing; /Tsinghua U. /Stanford U., Phys. Dept.; Scalapino, D.J. et al. March 25, 2010.

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Using an RPA approximation, we have calculated the strengths of the singlet and triplet pairing interactions which arise from the exchange of spin and orbital fluctuations for a 2-orbital model of the Fe-pnictide superconductors. When the system is doped with F, the electron pockets become dominant and we find that the strongest pairing occurs in the singlet d-wave pairing and the triplet p-wave pairing channels, which compete closely. The pairing structure in the singlet d-wave channel corresponds to a superposition of near neighbor intra-orbital singlets with a minus sign phase difference between the d{sub xz} and d{sub yz} pairs. The leading pairing configuration in the triplet channel also involves a nearest neighbor intra-orbital pairing. We find that the strengths of both the singlet and triplet pairing grow, with the singlet pairing growing faster, as the onsite Coulomb interaction approaches the value where the S = 1 particle-hole susceptibility diverges.

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6 pages

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  • Journal Name: Submitted to Physical Review

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  • Report No.: SLAC-PUB-13928
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 974190
  • Archival Resource Key: ark:/67531/metadc932076

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  • March 25, 2010

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Feb. 17, 2017, 6:35 p.m.

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Qi, Xiao-Liang; Raghu, S.; /Stanford U., Phys. Dept.; Liu, Chao-Xing; /Tsinghua U. /Stanford U., Phys. Dept.; Scalapino, D.J. et al. Pairing Strengths for a Two Orbital Model of the Fe-pnictides, article, March 25, 2010; United States. (digital.library.unt.edu/ark:/67531/metadc932076/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.