Polarized neutron scattering studies of the kagomé lattice antiferromagnet KFe3(OH)6(SO4)2
نویسندگان
چکیده
We report polarized neutron scattering studies of spin-wave excitations and spin fluctuations in the S=5/2 kagomé 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 TN = 65 K. Our results suggest that jarosite is a promising candidate for studying the 2D XY universality class in magnetic systems.
منابع مشابه
Spin waves in the frustrated kagomé lattice antiferromagnet KFe3(OH)6(SO4)2.
The spin wave excitations of the S=5/2 kagomé lattice antiferromagnet KFe3(OH)6(SO4)2 have been measured using high-resolution inelastic neutron scattering. We directly observe a flat mode which corresponds to a lifted "zero energy mode," verifying a fundamental prediction for the kagomé lattice. A simple Heisenberg spin Hamiltonian provides an excellent fit to our spin wave data. The antisymme...
متن کاملMagnetic Structure and Spin Waves in the Kagomé Jarosite Compound KFe3(SO4)2(OH)6
We present a detailed study of the magnetic structure and spin waves in the Fe jarosite compound KFe3(SO4)2(OH)6 for the most general Hamiltonian involving oneand two-spin interactions which are allowed by symmetry. We compare the calculated spin-wave spectrum with the recent neutron scattering data of Matan et al. for various model Hamiltonians which include, in addition to isotropic Heisenber...
متن کاملMagnetic ordering and fluctuation in kagomé lattice antiferromagnets , Fe and Cr jarosites
Jarosite family compounds, KFe3(OH)6(SO4)2, (abbreviate Fe jarosite), and KCr3(OH)6(SO4)2, (Cr jarosite), are typical examples of the Heisenberg antiferromagnet on the kagomé lattice and have been investigated by means of magnetization and NMR experiments. The susceptibility of Cr jarosite deviates from Curie-Weiss law due to the short-range spin correlation below about 150K and shows the magne...
متن کاملThe Ground State of the Spin-12 Kagomé Lattice Antiferromagnet: Neutron Scattering Studies of the Zinc-Paratacamite Mineral Family
The magnetic properties of the geometrically frustrated quantum magnets clinoatacamite, Cu2(OH)3Cl, and herbertsmithite, ZnCu3(OH)6Cl2, are studied by means of neutron scattering measurements as well as specific heat, susceptibility, and magnetization measurements. These materials are studied to investigate the nature of the ground state of the spin2 kagomé lattice antiferromagnet, as such a sy...
متن کاملA study on the dissolution rates of K-Cr(VI)-jarosites: kinetic analysis and implications
BACKGROUND The presence of natural and industrial jarosite type-compounds in the environment could have important implications in the mobility of potentially toxic elements such as lead, mercury, arsenic, chromium, among others. Understanding the dissolution reactions of jarosite-type compounds is notably important for an environmental assessment (for water and soil), since some of these elemen...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2009