TY - JOUR
T1 - Disappearance of static magnetic order and evolution of spin fluctuations in Fe1+δ Sex Te1-x
AU - Xu, Zhijun
AU - Wen, Jinsheng
AU - Xu, Guangyong
AU - Jie, Qing
AU - Lin, Zhiwei
AU - Li, Qiang
AU - Chi, Songxue
AU - Singh, D. K.
AU - Gu, Genda
AU - Tranquada, J. M.
PY - 2010/9/29
Y1 - 2010/9/29
N2 - We report neutron-scattering studies on static magnetic orders and spin excitations in the Fe-based chalcogenide system Fe1+δ Sex 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.
AB - We report neutron-scattering studies on static magnetic orders and spin excitations in the Fe-based chalcogenide system Fe1+δ Sex 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.
UR - http://www.scopus.com/inward/record.url?scp=77957567055&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.82.104525
DO - 10.1103/PhysRevB.82.104525
M3 - Article
AN - SCOPUS:77957567055
SN - 1098-0121
VL - 82
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 10
M1 - 104525
ER -