Common origin of the two types of magnetic fluctuations in iron chalcogenides
- University of Maryland and NIST
We use inelastic neutron scattering to study the low-energy spin excitations in moderately doped nonsuperconducting Fe{sub 1.01}Te{sub 0.72}Se{sub 0.28}. The spin excitations in this system contain components near (0.5,0,0) and (0.5,0.5,0) in a-b plane reciprocal lattice units using tetragonal unit cell notation (a = b = 3.772 {angstrom} and c = 6.061 {angstrom}). At low energies the scattering is centered around (0.5,0,0). With increasing energy, the spectral weight of low-energy spin excitations centered around (0.5,0,0) abruptly shifts around 3 meV to the incommensurate spin excitations centered around (0.5,0.5,0). However both types of spin fluctuations exhibit the identical temperature dependence. These results indicate that the (0.5,0,0)-type spin excitations and the incommensurate excitations around the (0.5,0.5,0) position have a common origin and both must be taken into account to understand the nature of magnetism and superconducting pairing in the iron chalcogenides.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1045285
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 84, Issue 21; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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