Magnetic-field and temperature-dependent Hall effect in UPd2Al3 epitaxial films

Huth, Michael; Hessert, J.; Jourdan, Martin; Kaldowski, A.; Adrian, H.

doi:10.1016/0921-4534(94)92440-6

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…1 and known from literature. [4,33,34] This can be described as ρ dc = ρ 0 + AT 2 , where A = 2.3 • 10 −7 Ωcm/K 2 , similar to previous studies. [35,36] Such a quadratic temperature dependence is usually taken as an indicator for Fermi-liquid behavior, which should lead to a characteristic frequency dependence of the relaxation rate as well.…”

Section: Frequency-dependent Relaxation Ratesupporting

confidence: 80%

Microwave conductivity of heavy fermions in UPd2Al3

2010

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Abstract. Heavy-fermion compounds are characterized by electronic correlation effects at low energies which can directly be accessed with optical spectroscopy. Here we present detailed measurements of the frequency-and temperature-dependent conductivity of the heavy-fermion compound UPd2Al3 using broadband microwave spectroscopy in the frequency range 45 MHz to 40 GHz at temperatures down to 1.7 K.We observe the full Drude response with a relaxation time up to 50 ps, proving that the mass enhancement of the heavy charge carriers goes hand in hand with an enhancement of the relaxation time. We show that the relaxation rate as a function of temperature scales with the dc resistivity. We do not find any signs of a frequency-dependent relaxation rate within the addressed frequency range. PACS

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Section: Frequency-dependent Relaxation Ratesupporting

confidence: 80%

Microwave conductivity of heavy fermions in UPd2Al3

2010

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“…The magnetic field dependence of the resistivity was found by calculating the impurity magnetization M I over the various field ranges given by Andrei et al [38]. Justification for using j = 1 2 for the ground state of UPd 2 Al 3 is based on specific heat [11], neutron scattering [2] and Hall-effect [39] results. We assume that j = 1 2 will also be appropriate for the Th-substituted derivatives of UPd 2 Al 3 .…”

Section: Temperature [K]mentioning

confidence: 99%

Magnetic, Kondo and non-Fermi-liquid behaviour of U_1-xTh_xPd₂Al₃

Plessis

Strydom

Troć

et al. 1999

J. Phys.: Condens. Matter

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Electrical resistivity ρ(T ), magnetoresistance MR, magnetization M(T , B) and magnetic susceptibility χ(T , B) measurements at temperatures down to 25 mK and applied magnetic fields up to 14 T are presented for Th-diluted U 1−x Th x Pd 2 Al 3 alloys. For U-rich alloys, antiferromagnetic order is observed and T N varies slowly with the Th concentration in the region 0 x 0.2. From ρ(T ) data we calculate a value of the energy gap = 12 K in the spinwave spectrum. In the U-rich concentration region a coherent Kondo description applies, but for alloys with 0.4x 0.93 a non-Fermi-liquid (NFL) phase prevails. An approximately linear temperature dependence of ρ(T ) is observed at low temperatures for about a decade in temperature, but deviation from this dependence occurs at the lowest temperatures. We show that the MR of the NFL alloys may be described in terms of the Coqblin-Schrieffer Hamiltonian, from which values of the single-ion characteristic Kondo temperature T K ≈ 40 K are calculated. An applied magnetic field is shown to recover Fermi-liquid dynamics in both χ(T ) and ρ(T ). We give a description of the low-temperature magnetization M(T , B) in terms of a two-channel Kondo model.

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