S. Alyones

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Publications (2)3.95 Total impact

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    Article: Complex conductivity of UTX compounds in high magnetic fields
    A. M. Alsmadi, S. Alyones, C. H. Mielke, R. D. McDonald, V. Zapf, M. M. Altarawneh, A. Lacerda, S. Chang, S. Adak, K. Kothapalli, H. Nakotte
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    ABSTRACT: We have performed rf-skin depth (complex-conductivity) and magnetoresistance measurements of antiferromagnetic U TX compounds ( T= Ni and X= Al , Ga, Ge) in applied magnetic fields up to 60 T applied parallel to the easy directions. The rf penetration depth was measured by coupling the sample to the inductive element of a resonant tank circuit and then, measuring the shifts in the resonant frequency Δf of the circuit. Shifts in the resonant frequency Δf are known to be proportional to the skin depth of the sample and we find a direct correspondence between the features in Δf and magnetoresistance. Several first-order metamagnetic transitions, which are accompanied by a drastic change in Δf , were observed in these compounds. In general, the complex-conductivity results are consistent with magnetoresistance data.
    Journal of Applied Physics 05/2009; · 2.17 Impact Factor
  • Article: Radio-frequency measurements of UNiX compounds (X=Al, Ga, Ge) in high magnetic fields
    A.M. Alsmadi, S. Alyones, C.H. Mielke, R.D. McDonald, V. Zapf, M.M. Altarawneh, A. Lacerda, S. Chang, S. Adak, K. Kothapalli, H. Nakotte
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    ABSTRACT: We performed radio-frequency (RF) skin-depth measurements of antiferromagnetic UNiX compounds (X=Al, Ga, Ge) in magnetic fields up to 60 T and at temperatures between 1.4 to ~60 K. Magnetic fields are applied along different crystallographic directions and RF penetration-depth was measured using a tunnel-diode oscillator (TDO) circuit. The sample is coupled to the inductive element of a TDO resonant tank circuit, and the shift in the resonant frequency Δf of the circuit is measured. The UNiX compounds exhibit field-induced magnetic transitions at low temperatures, and those transitions are accompanied by a drastic change in Δf. The results of our skin-depth measurements were compared with previously published B–T phase diagrams for these three compounds.
    Journal of Magnetism and Magnetic Materials 321(22):3712-3718. · 1.78 Impact Factor
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