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Title: Disappearance of static magnetic order and evolution of spin fluctuations in Fe 1+δSe xTe 1-x

Abstract

We report neutron-scattering studies on static magnetic orders and spin excitations in the Fe-based chalcogenide system Fev Se 1+δ 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.

Authors:
 [1];  [2];  [3];  [3];  [3];  [3];  [4];  [4];  [3];  [3]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); City College of New York, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. National Inst. of Standards and Technology, Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC); Center for Emergent Superconductivity (CES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1065171
DOE Contract Number:  
AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 82; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; phonons; thermal conductivity; energy storage (including batteries and capacitors); superconductivity; defects; spin dynamics

Citation Formats

Xu, Zhijun, Wen, Jinsheng, Xu, Guangyong, Jie, Qing, Lin, Zhiwei, Li, Qiang, Chi, Songxue, Singh, D. K., Gu, Genda, and Tranquada, John M. Disappearance of static magnetic order and evolution of spin fluctuations in Fe1+δSexTe1-x. United States: N. p., 2010. Web. doi:10.1103/PhysRevB.82.104525.
Xu, Zhijun, Wen, Jinsheng, Xu, Guangyong, Jie, Qing, Lin, Zhiwei, Li, Qiang, Chi, Songxue, Singh, D. K., Gu, Genda, & Tranquada, John M. Disappearance of static magnetic order and evolution of spin fluctuations in Fe1+δSexTe1-x. United States. doi:10.1103/PhysRevB.82.104525.
Xu, Zhijun, Wen, Jinsheng, Xu, Guangyong, Jie, Qing, Lin, Zhiwei, Li, Qiang, Chi, Songxue, Singh, D. K., Gu, Genda, and Tranquada, John M. Wed . "Disappearance of static magnetic order and evolution of spin fluctuations in Fe1+δSexTe1-x". United States. doi:10.1103/PhysRevB.82.104525.
@article{osti_1065171,
title = {Disappearance of static magnetic order and evolution of spin fluctuations in Fe1+δSexTe1-x},
author = {Xu, Zhijun and Wen, Jinsheng and Xu, Guangyong and Jie, Qing and Lin, Zhiwei and Li, Qiang and Chi, Songxue and Singh, D. K. and Gu, Genda and Tranquada, John M.},
abstractNote = {We report neutron-scattering studies on static magnetic orders and spin excitations in the Fe-based chalcogenide system Fev Se1+δ Te1-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.},
doi = {10.1103/PhysRevB.82.104525},
journal = {Physical Review B},
number = ,
volume = 82,
place = {United States},
year = {Wed Sep 29 00:00:00 EDT 2010},
month = {Wed Sep 29 00:00:00 EDT 2010}
}