Common Origin of the Two Types of Magnetic Fluctuations in Iron Chalcogenides

Published

December 5, 2011

Author(s)

Songxue Chi, Jose Rodriguez Rivera, Jeffrey W. Lynn, Chenglin Zhang, D. Phelan, Deepak Singh, Rick L. Paul, Pengcheng Dai

Abstract

We use inelastic neutron scattering to study the low energy spin excitations in moderately doped non-superconducting Fe_1.01Te_0.72Se_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. At low energies the scattering is centered around (0.5,0.5,0). With increasing energy, the spectral weight of low energy spin excitations centere around (0.5,0,0) abruptly shifts around 2 meV to the incommensurate spin 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.

Citation

Physical Review B

Volume

84

Issue

21

Pub Type

Journals

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Keywords

Iron Superconductors, Spin Excitations, Commensurate Excitations, Incommensurage Excitations, Inelastic neutron scattering

Citation

Chi, S. , Rodriguez Rivera, J. , Lynn, J. , Zhang, C. , Phelan, D. , Singh, D. , Paul, R. and Dai, P. (2011), Common Origin of the Two Types of Magnetic Fluctuations in Iron Chalcogenides, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=909781 (Accessed April 19, 2024)