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@article{1109103,
author = {Chaloupka, Jiří and Khaliullin, Giniyat},
article_number = {20},
doi = {http://dx.doi.org/10.1103/PhysRevLett.110.207205},
keywords = {iron pnictides; quantum magnetism; spin-state crossover},
language = {eng},
issn = {0031-9007},
journal = {Physical Review Letters},
title = {Spin-State Crossover Model for the Magnetism of Iron Pnictides},
url = {http://prl.aps.org/abstract/PRL/v110/i20/e207205},
volume = {110},
year = {2013}
}
TY - JOUR
ID - 1109103
AU - Chaloupka, Jiří - Khaliullin, Giniyat
PY - 2013
TI - Spin-State Crossover Model for the Magnetism of Iron Pnictides
JF - Physical Review Letters
VL - 110
IS - 20
SP - "207205-1"-"207205-5"
EP - "207205-1"-"207205-5"
PB - Americal Physical Society
SN - 00319007
KW - iron pnictides
KW - quantum magnetism
KW - spin-state crossover
UR - http://prl.aps.org/abstract/PRL/v110/i20/e207205
L2 - http://prl.aps.org/abstract/PRL/v110/i20/e207205
N2 - We propose a minimal model describing magnetic behavior of Fe-based superconductors. The key ingredient of the model is a dynamical mixing of quasidegenerate spin states of Fe2+ ion by intersite electron hoppings, resulting in an effective local spin Seff. The moments Seff tend to form singlet pairs and may condense into a spin nematic phase due to the emergent biquadratic exchange couplings. The longrange ordered part m of Seff varies widely, 0<=m<=Seff, but magnon spectra are universal and scale with Seff, resolving the puzzle of large but fluctuating Fe moments. Unusual temperature dependences of a local moment and spin susceptibility are also explained.
ER -
CHALOUPKA, Jiří a Giniyat KHALIULLIN. Spin-State Crossover Model for the Magnetism of Iron Pnictides. \textit{Physical Review Letters}. Americal Physical Society, roč.~110, č.~20, s.~''207205-1''-''207205-5'', 5 s. ISSN~0031-9007. doi:10.1103/PhysRevLett.110.207205. 2013.
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