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Point-contact study of UCu4+<i>x</i>AI8–<i>x</i> compounds

Yu. G. NaĭdyukB. I. Verkin Physiotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovO. E. KvitnitskayaB. I. Verkin Physiotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovI. K. YansonB. I. Verkin Physiotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovW. SuskiW. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, WroclawL. FolchikW. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wroclaw

Low Temperature Physicsjournal1993en

ABI

Annotatsiya

The first IVC derivative dV/dI(V) and its temperature dependence are measured for heterojunctions formed by UCu4+xAl8–x (x=0, 0.5, and 1.5) and pure metals Cu, Fe and Ni. It is found that the main peculiarities of the dV/dI(V) dependence take place at a temperature below T* which is close to the Néel temperature for compounds with x=0 and 0.5. The behavior of dV/dI(V) in the case is in good agreement with the dependence calculated by using the thermal model of current flow through a point contact, taking into account the degradation of the properties of the material near the surface. It was found that T* for the sample with x= 1.5 considerably exceeds the temperature at which a resistivity peak is formed due to coherent effects during a transition to the heavy-fermion state.

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Mavzular

Rare-earth and actinide compounds Iron-based superconductors research Inorganic Chemistry and Materials

Identifikatorlar

DOI: 10.1063/10.0033382

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