Disappearance of static magnetic order and evolution of spin fluctuations in Fe1+δSexTe1-x

Xu, Zhijun; Wen, Jinsheng; Xu, Guangyong; Jie, Qing; Lin, Zhiwei; Li, Qiang; Chi, Songxue; Singh, D. K.; Gu, Genda; Tranquada, J. M.

doi:10.1103/PhysRevB.82.104525

Title: Disappearance of static magnetic order and evolution of spin fluctuations in ${Fe}_{1 + δ} {Se}_{x} {Te}_{1 - x}$

Journal Article · Wed Sep 01 00:00:00 EDT 2010 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.82.104525· OSTI ID:1385906

Xu, Zhijun; Wen, Jinsheng; Xu, Guangyong; Jie, Qing; Lin, Zhiwei; Li, Qiang; Chi, Songxue; Singh, D. K.; Gu, Genda; Tranquada, J. M.

We report neutron-scattering studies on static magnetic orders and spin excitations in the Fe-based chalcogenide system Fe 1 + δ Se x Te 1 - 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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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: AC02-98CH10886

OSTI ID:: 1385906

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 82, Issue 10; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory; ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Title: Disappearance of static magnetic order and evolution of spin fluctuations in ${Fe}_{1 + δ} {Se}_{x} {Te}_{1 - x}$