Itinerancy enhanced quantum fluctuation of magnetic moments in iron-based superconductors
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1226030
- Alternate Identifier(s):
- OSTI ID: 1215465
- Report Number(s):
- BNL-108229-2015-JA
Journal ID: ISSN 0031-9007; R&D Project: PM002; KC0202030
- Grant/Contract Number:
- SC00112704; AC02-98CH10886; NBRPC-2012CB821400; NSFC-11275279; SRFDP-20110171110026
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 115; Journal Issue: 11; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Tam, Yu -T., Ku, W., and Yao, D. -X. Itinerancy enhanced quantum fluctuation of magnetic moments in iron-based superconductors. United States: N. p., 2015.
Web. doi:10.1103/PhysRevLett.115.117001.
Tam, Yu -T., Ku, W., & Yao, D. -X. Itinerancy enhanced quantum fluctuation of magnetic moments in iron-based superconductors. United States. https://doi.org/10.1103/PhysRevLett.115.117001
Tam, Yu -T., Ku, W., and Yao, D. -X. Thu .
"Itinerancy enhanced quantum fluctuation of magnetic moments in iron-based superconductors". United States. https://doi.org/10.1103/PhysRevLett.115.117001. https://www.osti.gov/servlets/purl/1226030.
@article{osti_1226030,
title = {Itinerancy enhanced quantum fluctuation of magnetic moments in iron-based superconductors},
author = {Tam, Yu -T. and Ku, W. and Yao, D. -X.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.115.117001},
journal = {Physical Review Letters},
number = 11,
volume = 115,
place = {United States},
year = {Thu Sep 10 00:00:00 EDT 2015},
month = {Thu Sep 10 00:00:00 EDT 2015}
}
Web of Science
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