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Intriguing Magnetoresistivity of URh_{0.62}Ru_{0.38}Ge in the Non-Fermi Liquid Regime

100%
Miiller W., Tran V.
Acta Physica Polonica A
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2009
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vol. 115
|
issue 1
144-146
EN
Magnetoresistivity of URh_{0.62}Ru_{0.38}Ge solid solution was measured in the temperature range 0.35-300 K and in magnetic fields up to 9 T. For the studied system, which lies on the border of ferromagnetism, we observe positive magnetoresistivity in the non-Fermi liquid regime. The finding is in striking disagreement with scenario predicted for ferromagnetic quantum critical point.
2
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Ru_3Sn_7: Phonon Reference for Superconducting Mo_3Sb_7

100%
Tran V., Miiller W.
Acta Physica Polonica A
|
2009
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vol. 115
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issue 1
83-85
EN
In order to search for phonon reference for dimer-gapped superconducting Mo_3Sb_7, measurements of specific heat (C_p(T)) and electrical resistivity (ρ(T)) of Ru_3Sn_7 were performed in the temperature range 2-300 K. The phonon part of C_p(T) and ρ(T) of Ru_3Sn_7 can satisfactorily be explained describing the spectrum with one Einstein and two Debye modes. We found Θp_{E} ≈ 100 K, Θp_{D1} ≈ 185 K and Θp_{D2} ≈298 K. The magnetic specific heat of Mo_3Sb_7 exhibits a sharp maximum at T*= 50 K, below which follows a gap function. Magnetic resistivity increases as -lnT with decreasing temperature and shows maximum at T*.
3
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Thermoelectric Power of CeNi_4Si and YbNi_4Si Compounds

81%
Falkowski M., Kowalczyk A., Tran V., Miiller W.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
303-306
EN
The thermoelectric power was measured from 4.2 to 300 K for CeNi_4Si and YbNi_4Si. The thermoelectric power was analysed in the framework of the phenomenological resonance model. According to the model the dominant contribution to thermopower is caused by scattering between electrons of a broad s-band and a narrow f-band with the Lorentzian shape. The electron-hole analogy is reflected in the thermoelectric power behaviour of the investigated compounds.
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