Journal
PHYSICAL REVIEW B
Volume 82, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.104525
Keywords
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Funding
- Office of Basic Energy Sciences, Division of Materials Science and Engineering, U.S. Department of Energy (DOE) [DE-AC02-98CH10886]
- U.S. DOE, Office of Basic Energy Sciences
- National Science Foundation [DMR-0454672]
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We report neutron-scattering studies on static magnetic orders and spin excitations in the Fe-based chalco-genide system Fe1+delta SexTe1-x with different Fe and Se compositions. Short-range static magnetic order with an in-plane wave vector near the (0.5.0) (using the two-Fe unit cell), together with strong low-energy magnetic excitations is found in all nonsuperconducting samples for Se doping up to 45%. When the static order disappears and bulk superconductivity emerges, the spectral weight of the magnetic excitations shifts to the region of reciprocal space near the in-plane wave vector (0.5, 0.5), corresponding to collinear spin correlations. Our results suggest that there is a strong correlation between superconductivity and the character of the magnetic order/fluctuations in this system. Excess Fe appears to be important for stabilizing the magnetic order that competes with superconductivity.
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