期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 114, 期 22, 页码 E4354-E4359出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1703295114
关键词
high-T-c superconductivity; neutron scattering; oxyhydrides; iron-based superconductors; antiferromagnetism
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) Element Strategy Initiative Project
- Japan Society for the Promotion of Science (JSPS) [26800182]
- Grants-in-Aid for Scientific Research [26800182] Funding Source: KAKEN
In iron-based superconductors, high critical temperature (T-c) superconductivity over 50 K has only been accomplished in electron-doped hREFeAsO (hRE is heavy rare earth (RE) element). Although hREFeAsO has the highest bulk T-c (58 K), progress in understanding its physical properties has been relatively slow due to difficulties in achieving high-concentration electron doping and carrying out neutron experiments. Here, we present a systematic neutron powder diffraction study of (SmFeAsO1-xDx)-Sm-154, and the discovery of a long-range antiferromagnetic ordering with x >= 0.56 (AFM2) accompanying a structural transition from tetragonal to orthorhombic. Surprisingly, the Fe magnetic moment in AFM2 reaches a magnitude of 2.73 mu(B)/Fe, which is the largest in all nondoped iron pnictides and chalcogenides. Theoretical calculations suggest that the AFM2 phase originates in kinetic frustration of the Fe-3d(xy) orbital, in which the nearest-neighbor hopping parameter becomes zero. The unique phase diagram, i.e., highest-T-c superconducting phase adjacent to the strongly correlated phase in electron-overdoped regime, yields important clues to the unconventional origins of superconductivity.
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