Journal
SCIENCE
Volume 345, Issue 6197, Pages 657-660Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1251853
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Funding
- Ministry of Science and Technology of China [2012CB821400, 2011CBA00110]
- National Natural Science Foundation of China
- China Academy of Engineering Physics
- U.S. NSF [DMR-1308603, DMR-1362219, DMR-1309531]
- Robert A. Welch Foundation [C-1839, C-1818, C-1411]
- Alexander von Humboldt Foundation
- NSF [PHYS-1066293]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1362219, 1309531, 1308603] Funding Source: National Science Foundation
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Understanding the microscopic origins of electronic phases in high-transition temperature (high-T-c) superconductors is important for elucidating the mechanism of superconductivity. In the paramagnetic tetragonal phase of BaFe2-xTxAs2 (where T is Co or Ni) iron pnictides, an in-plane resistivity anisotropy has been observed. Here, we use inelastic neutron scattering to show that low-energy spin excitations in these materials change from fourfold symmetric to twofold symmetric at temperatures corresponding to the onset of the in-plane resistivity anisotropy. Because resistivity and spin excitation anisotropies both vanish near optimal superconductivity, we conclude that they are likely intimately connected.
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