2017
DOI: 10.1103/physrevb.96.024520
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Pairing tendencies in a two-orbital Hubbard model in one dimension

Abstract: The recent discovery of superconductivity under high pressure in the ladder compound BaFe2S3 has opened a new field of research in iron-based superconductors with focus on quasi one-dimensional geometries. In this publication, using the Density Matrix Renormalization Group technique, we study a two-orbital Hubbard model defined in one dimensional chains. Our main result is the presence of hole binding tendencies at intermediate Hubbard U repulsion and robust Hund coupling JH /U = 0.25. Binding does not occur n… Show more

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Cited by 32 publications
(37 citation statements)
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“…These recent developments in the context of two-leg iron ladders remind us of the previous results for copper ladders where superconducting tendencies upon doping were theoretically predicated and later confirmed experimentally [24][25][26]. In fact, in iron ladders similar pairing tendencies were observed upon hole doping by theoretical research based on density matrix renormalization group (DMRG) at intermediate Hubbard coupling strengths [13,17]. Another possible explanation of superconductivity is the originally-proposed band narrowing by pressure [9].…”
Section: Introductionsupporting
confidence: 60%
“…These recent developments in the context of two-leg iron ladders remind us of the previous results for copper ladders where superconducting tendencies upon doping were theoretically predicated and later confirmed experimentally [24][25][26]. In fact, in iron ladders similar pairing tendencies were observed upon hole doping by theoretical research based on density matrix renormalization group (DMRG) at intermediate Hubbard coupling strengths [13,17]. Another possible explanation of superconductivity is the originally-proposed band narrowing by pressure [9].…”
Section: Introductionsupporting
confidence: 60%
“…In terms of real materials, we notice that the two-layered ladder system can be regarded as a two-orbital ladder system with Hund's interaction. The pairing in our system appears between two electrons at the nearest neighboring sites with different orbitals, which is similar to the previous studies on iron-based ladder compounds [47]. Besides, this work can also be helpful for future studies of the doped spin-1 Heisenberg model in two-dimension.…”
Section: Resultssupporting
confidence: 86%
“…Introduction -The recent discovery of superconductivity in the two-leg iron-based ladder compounds BaFe 2 S 3 [1,2] and BaFe 2 Se 3 [3] opened an exciting new branch of research: these materials are the first members of the iron superconductors family [4][5][6] without iron layers, the parent compounds are insulators [1,2], and their low-dimensionality allows for accurate theoretical treatment [7][8][9][10][11]. For this reason, iron-ladder compounds were the focus of many recent experimental and theoretical studies [1][2][3][12][13][14][15][16][17][18][19][20][21]. In particular, inelastic neutron scattering data [19] is compatible with the exciting idea that BaFe 2 Se 3 is in an orbital-selective Mott phase (OSMP) at ambient pressure [22][23][24], where one orbital is localized with a Mott gap while the others are gapless and itinerant (see Fig.…”
mentioning
confidence: 99%