Non-Fermi-liquid behavior in single-crystal CaRuO3: Comparison to ferromagnetic SrRuO3

G. Cao, O. Korneta, S. Chikara, L. E. DeLong, P. Schlottmann

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

We report calorimetric, magnetic and electric transport properties of single-crystal CaRuO3 and SrRuO3 as a function of temperature T and applied magnetic field B. We find that CaRuO3 is a non-Fermi-liquid metal near a magnetic instability, as characterized by the following properties: (1) the heat capacity C (T, B) ∼ - T log T is readily enhanced in low applied fields, and exhibits a Schottky peak at 2.3 K that exhibits field dependence when T is reduced; (2) the magnetic susceptibility diverges as T- γ at low temperatures with 1 / 2 < γ < 1, depending on the applied field; and (3) the electrical resistivity exhibits a T3 / 2 dependence over the range 1.7 < T < 24 K. No Shubnikov-de Haas oscillations are discerned at T = 0.65 K for applied fields up to 45 T. These properties, which sharply contrast those of the itinerant ferromagnet SrRuO3, indicate CaRuO3 is a rare example of a stoichiometric oxide compound that exhibits non-Fermi-liquid behavior near a quantum critical point.

Original languageEnglish
Pages (from-to)305-309
Number of pages5
JournalSolid State Communications
Volume148
Issue number7-8
DOIs
StatePublished - Nov 2008

Bibliographical note

Funding Information:
This work was supported by NSF through grants DMR-0240813 and 0552267. L.E.D. is supported by U.S. DoE Grant DE-FG02-97ER45653. P.S. is supported by the DOE through grant DE-FG02-98ER45707.

Keywords

  • A. Non-Fermi-liquid behavior
  • B. Quantum criticality
  • C. Spin fluctuations

ASJC Scopus subject areas

  • Chemistry (all)
  • Condensed Matter Physics
  • Materials Chemistry

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