Рубрики:
TRANSITION
Кл.слова (ненормированные):
copper -- gallium -- glass -- oxygen -- acceleration -- article -- magnetism -- measurement -- molecular dynamics -- phase transition
TRANSITION
Кл.слова (ненормированные):
copper -- gallium -- glass -- oxygen -- acceleration -- article -- magnetism -- measurement -- molecular dynamics -- phase transition
Аннотация: Magnetic susceptibility, magnetization, specific-heat, and positive muon spin relaxation (?SR) measurements have been used to characterize the magnetic ground state of the spinel compound CuGa2O4. We observe a spin-glass transition of the S = 1/2 Cu2+ spins below Tf = 2.5 K characterized by a cusp in the susceptibility curve which is suppressed when a magnetic field is applied. We show that the magnetization of CuGa2O4 depends on the magnetic history of the sample. Well below Tf, the muon signal resembles the dynamical Kubo-Toyabe expression reflecting that the spin freezing process in CuGa2O4 results in a Gaussian distribution of the magnetic moments. By means of Monte Carlo simulations, we obtain the relevant exchange integrals between the Cu2+ spins in this compound.
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Держатели документа:
Institute of Physics, Academy of Sciences, Siberian Branch, 660036 Krasnoyarsk, Russian Federation
Laboratory for Neutron Scattering, Paul Scherrer Institute, ETH Zurich, CH-5232 Villigen PSI, Switzerland
Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
Instituto de Ciencia de Materiales de Aragon, CSIC-Universidad de Zaragoza, Ciudad Universitaria, 50009 Zaragoza, Spain
Kamerlingh Onnes Laboratorium, Leiden University, Netherlands
Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Roessli, B.; Semadeni, F.; Amato, A.; Baines, C.; Bartolome, J.; Evangelisti, M.