CHALOUPKA, Jiří a Giniyat KHALIULLIN. Spin-State Crossover Model for the Magnetism of Iron Pnictides. Physical Review Letters. Americal Physical Society, 2013, roč. 110, č. 20, s. "207205-1"-"207205-5", 5 s. ISSN 0031-9007. Dostupné z: https://dx.doi.org/10.1103/PhysRevLett.110.207205. |
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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, 2013, roč.~110, č.~20, s.~''207205-1''-''207205-5'', 5 s. ISSN~0031-9007. Dostupné z: https://dx.doi.org/10.1103/PhysRevLett.110.207205.
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