Polarized neutron scattering studies of the kagomé lattice antiferromagnet期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Polarized neutron scattering studies of the kagomé lattice antiferromagnet

Authors:	K. Matan J.S. Helton D. Grohol D.G. Nocera S. Wakimoto K. Kakurai Y.S. Lee

Affiliation:	^aDepartment of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;^bThe Dow Chemical Company, Core R&D, Midland, MI 48674, USA;^cDepartment of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;^dQuantum Beam Science Directorate, Japanese Atomic Energy Agency, 2-4 Shirakata Shirane, Tokai, Naka, Ibaraki 319-1195, Japan

Abstract:	We report polarized neutron scattering studies of spin-wave excitations and spin fluctuations in the lattice antiferromagnet KFe₃(OH)₆(SO₄)₂ (jarosite). Inelastic polarized neutron scattering measurements at 10 K on a single crystal sample reveal two spin gaps, associated with in-plane and out-of-plane excitations. The polarization analysis of quasi-elastic scattering at 67 K shows in-plane spin fluctuations with XY symmetry, consistent with the disappearance of the in-plane gap above the Néel temperature . Our results suggest that jarosite is a promising candidate for studying the 2D XY universality class in magnetic systems.

Keywords:	Polarized neutron scattering Kagomé lattice antiferromagnet Jarosite Spin-waves Spin fluctuations
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