Magnetic excitations of Fe1+ySexTe1-x in magnetic and superconductive phases

被引：37

作者：

Babkevich, P. ^{[1
,2
]}

Bendele, M. ^{[3
,4
]}

Boothroyd, A. T. ^{[1
]}

Conder, K. ^{[5
]}

Gvasaliya, S. N. ^{[2
]}

Khasanov, R. ^{[3
]}

Pomjakushina, E. ^{[5
]}

Roessli, B. ^{[2
]}

机构：

[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[2] Paul Scherrer Inst, Neutron Scattering Lab, CH-5232 Villigen, Switzerland

[3] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland

[4] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

[5] Paul Scherrer Inst, Lab Dev & Methods, CH-5232 Villigen, Switzerland

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2010年 / 22卷 / 14期

基金：

英国工程与自然科学研究理事会;

关键词：

PRESSURE; NEUTRON; FESE;

D O I：

10.1088/0953-8984/22/14/142202

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have used inelastic neutron scattering and muon-spin rotation to compare the low energy magnetic excitations in single crystals of superconducting Fe1.01Se0.50Te0.50 and non-superconducting Fe1.10Se0.25Te0.75. We confirm the existence of a spin resonance in the superconducting phase of Fe1.01Se0.50Te0.50, at an energy of 7 meV and a wavevector of (1/2, 1/2, 0). The non-superconducting sample exhibits two incommensurate magnetic excitations at (1/2, 1/2, 0) +/- (0.18, -0.18, 0) which rise steeply in energy, but no resonance is observed at low energies. A strongly dispersive low energy magnetic excitation is also observed in Fe1.10Se0.25Te0.75 close to the commensurate antiferromagnetic ordering wavevector (1/2 - delta, 0, 1/2), where delta approximate to 0.03. The magnetic correlations in both samples are found to be quasi-two-dimensional in character and persist well above the magnetic (Fe1.10Se0.25Te0.75) and superconducting (Fe1.01Se0.50Te0.50) transition temperatures.

引用

页数：6

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