title: Field-dependent ordered phases and Kondo phenomena in the filled skutterudite compound PrOs4As12.
abstract: Electrical resistivity, specific heat, and magnetization measurements to temperatures as low as 80 mK and magnetic fields up to 16 T were made on the filled skutterudite compound PrOs4As12. The measurements reveal the presence of two ordered phases at temperatures below approximately 2.3 K and in fields below approximately 3 T. Neutron-scattering experiments in zero field establish an antiferromagnetic ground state < 2.28 K. In the antiferromagnetically ordered state, the electronic-specific heat coefficient gamma approximately 1 J/mol x K2 below 1.6 K and 0 < or = H < or = 1.25 T. The temperature and magnetic-field dependence of the electrical resistivity and specific heat in the paramagnetic state are consistent with single-ion Kondo behavior with a low Kondo temperature on the order of 1 K. The electronic-specific heat in the paramagnetic state can be described by the resonance-level model with a large zero-temperature electronic-specific heat coefficient that decreases with increasing magnetic field from approximately 1 J/mol x K2 at 3 T to approximately 0.2 J/mol x K2 at 16 T.
authors.affiliation: Department of Physics, University of California at San Diego, La Jolla, CA 92093, USA. mbmaple@physics.ucsd.edu
authors.forename: M B
authors.initials: MB
authors.lastname: Maple
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authors.lastname: Butch
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authors.lastname: Frederick
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authors.forename: J R
authors.initials: JR
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authors.lastname: Yanagisawa
authors.forename: W M
authors.initials: WM
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authors.lastname: Chi
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authors.lastname: Kang
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authors.forename: Pengcheng
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authors.lastname: Dai
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authors.lastname: McCall
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authors.lastname: McElfresh
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authors.lastname: Fluss
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authors.lastname: Henkie
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authors.lastname: Pietraszko