Doped Two Orbital Chains with Strong Hund's Rule Couplings-Ferromagnetism, Spin Gap, Singlet and Triplet Pairings : Condensed Matter: Electronic Properties, etc.

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概要

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• Different models for doping of two-orbital chains with mobile S = l/2 fermions and strong, ferromagnetic (FM) Hund's rule couplings stabilizing the S = 1 spins are investigated by density matrix renormalization group (DMRG) methods. The competition between antiferromagnetic (AF) and FM order leads to a rich phase diagram with a narrow FM region for weak AF couplings and strongly enhanced triplet pairing correlations. Without a level difference between the orbitals, the spin gap persists upon doping, whereas gapless spin excitations are generated by interactions among itinerant polarons in the presence of a level difference. In the charge sector we find dominant singlet pairing correlations without a level difference, whereas upon the inclusion of a Coulomb repulsion between the orbitals or with a level difference, charge density wave (CDW) correlations decay slowest. The string correlation functions remain finite upon doping for all models.

• 社団法人日本物理学会の論文
• 2001-02-15

著者

• Ammon B

  Issp University Of Tohyo

• AMMON Beat

  ISSP, University of Tohyo

• IMADA Masatoshi

  ISSP, University of Tohyo

• Imada Masatoshi

  Issp University Of Tohyo

関連論文

• Doped Two Orbital Chains with Strong Hund's Rule Couplings-Ferromagnetism, Spin Gap, Singlet and Triplet Pairings : Condensed Matter: Electronic Properties, etc.
• Effect of the Orbital Level Difference in Doped Spin-1 Chains : Condensed Matter: Electronic Properties, etc.
• 24pWM-7 Critical Behavior of Disordered System in the Vicinity of Mott Transition

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