Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 32, Issue 37, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/ab3b3b
Keywords
iron-based superconductors; anti ferromagnetism; neutron scattering
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Funding
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0012704]
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Neutron scattering has played a significant role in characterizing magnetic and structural correlations in Fe(1+y )Te(1-x)Se(x)and their connections with superconductivity. Here we review several key aspects of the physics of iron chalcogenide superconductors where neutron studies played a key role. These topics include the phase diagram of Fe1+y Te1-xSex, where the doping-dependence of structural transitions can be understood from a mapping to the anisotropic random field Ising model. We then discuss orbital-selective Mott physics in the Fe chalcogenide series, where temperature-dependent magnetism in the parent material provided one of the earliest cases for orbital-selective correlation effects in a Hund's metal. Finally, we elaborate on the character of local magnetic correlations revealed by neutron scattering, its dependence on temperature and composition, and the connections to nematicity and superconductivity.
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