Itinerancy enhanced quantum fluctuation of magnetic moments in iron-based superconductors

Tam, Yu -T.; Ku, W.; Yao, D. -X.

doi:10.1103/PhysRevLett.115.117001

Title: Itinerancy enhanced quantum fluctuation of magnetic moments in iron-based superconductors

Journal Article · Thu Sep 10 00:00:00 EDT 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.115.117001· OSTI ID:1226030

Tam, Yu -T. ^[1]; Ku, W. ^[2]; Yao, D. -X. ^[3]

Brookhaven National Lab. (BNL), Upton, NY (United States); Sun Yat-Sen Univ., Guangzhou, (China)
Sun Yat-Sen Univ., Guangzhou, (China)
Brookhaven National Lab. (BNL), Upton, NY (United States)

We investigate the influence of itinerant carriers on dynamics and fluctuation of local moments in Fe-based superconductors, via linear spin-wave analysis of a spin-fermion model containing both itinerant and local degrees of freedom. Surprisingly against the common lore, instead of enhancing the (π,0) order, itinerant carriers with well nested Fermi surfaces is found to induce significant amount of spatial and temporal quantum fluctuation that leads to the observed small ordered moment. Interestingly, the underlying mechanism is shown to be intra-pocket nesting-associated long-range coupling, rather than the previously believed ferromagnetic double-exchange effect. This challenges the validity of ferromagnetically compensated first-neighbor coupling reported from short-range fitting to the experimental dispersion, which turns out to result instead from the ferro-orbital order that is also found instrumental in stabilizing the magnetic order.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704; AC02-98CH10886; NBRPC-2012CB821400; NSFC-11275279; SRFDP-20110171110026

OSTI ID:: 1226030

Alternate ID(s):: OSTI ID: 1215465

Report Number(s):: BNL-108229-2015-JA; R&D Project: PM002; KC0202030

Journal Information:: Physical Review Letters, Vol. 115, Issue 11; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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Stripes developed at the strong limit of nematicity in FeSe film Li, Wei; Zhang, Yan; Deng, Peng Nature Physics, Vol. 13, Issue 10 https://doi.org/10.1038/nphys4186	journal	July 2017
Pressure-driven phase transition from antiferromagnetic semiconductor to nonmagnetic metal in the two-leg ladders $A {Fe}_{2} X_{3}$ ( $A = Ba, K$ ; $X = S, Se$ ) Zhang, Yang; Lin, Lingfang; Zhang, Jun-Jie Physical Review B, Vol. 95, Issue 11 https://doi.org/10.1103/physrevb.95.115154	journal	March 2017
Charge Density Wave and Spin Density Wave in Two-Orbital Model for Iron-Based Superconductors Pradhan, B. SPIN, Vol. 08, Issue 02 https://doi.org/10.1142/s2010324718500078	journal	June 2018
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