期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.187001
关键词
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资金
- MEXT of Japan
- Grants-in-Aid for Scientific Research [26800185] Funding Source: KAKEN
The isostructural transition in the tetragonal phase with a sizable change in the anion height, is realized in heavily H-doped LaFeAsO and (La, P) codoped CaFe2As2. In these compounds, the superconductivity with higher T-c (40-50 K) is realized near the isostructural transition. To find the origin of the anion-height instability and the role in realizing the higher-T-c state, we develop the orbital-spin fluctuation theory by including the vertex correction. We analyze LaFeAsO1-xHx and find that the non-nematic orbital fluctuations, which induce the anion- height instability, are automatically obtained at x similar to 0.5, in addition to the conventional nematic orbital fluctuations at x similar to 0. The non- nematic orbital order triggers the isostructural transition, and its fluctuation would be a key ingredient to realize higher-T-c superconductivity of order 50 K.
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