Pressure, substitution, and magnetic-field dependence of the valence phase transition in Yb0.4In0.6Cu2

I. Nowik*, I. Felner, J. Voiron, J. Beille, A. Najib, E. Du Tremolet De Lacheisserie, G. Gratz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

Magnetization, resistivity, thermal expansion coefficient, and x-ray unit-cell measurements of Yb0.4In0.6Cu2 under pressure (P up to 25 kbar) and in magnetic fields (Hext up to 180 kOe) at temperatures 4.2-80 K have been performed. The valence-phase-transition temperature, Tv, is pressure dependent and surprisingly enough also field dependent. One obtains dTv/dP=-2.1 K/kbar for P<6 kbar. Negative chemical pressure obtained by substituting Yb by La or Cu by Ag increases Tv. A theoretical analysis within a previously published model shows that the interconfigurational excitation energy below Tv changes with pressure at a rate dE0/dP=-11 K/kbar. The external magnetic field does not affect E0, but it increases the Yb3+ excited-state population and thus drives the phase transition to a lower temperature at a rate dTv/dHext=-0.022 K/kOe.

Original languageEnglish
Pages (from-to)5633-5638
Number of pages6
JournalPhysical Review B
Volume37
Issue number10
DOIs
StatePublished - 1988

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