Ground states of a triangular copper oxide system

A. P. Ramirez, R. J. Cava, J. J. Krajewski, W. F. Peck

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13 Scopus citations

Abstract

The low-temperature specific heat, C(T), of the Delafossite family of triangle-planar cuprates, RCuO2+δ, has been studied for R=La and Y and 0<δ≤2/3. Structural transformations between the hexagonal and the orthorhombic phases for R=Y appear as distinct lattice-contribution changes in C(T). Near the oxygen-ordered limit, δ=2/3, C(T) displays a linear-in-T term of 6.5 and 1.3 mJ/mole K2 for R=La and Y, respectively. The large specific-heat enhancement and a similar enhancement of the magnetic susceptibility for R=La are interpreted in terms of strong correlations near a metal-antiferromagnetic-insulator instability.

Original languageEnglish (US)
Pages (from-to)16082-16085
Number of pages4
JournalPhysical Review B
Volume49
Issue number22
DOIs
StatePublished - Jan 1 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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