Unusual Kondo behavior in the indium-rich heavy-fermion antiferromagnet Ce3Pt4In13

Phys. Rev. B 65, 024401 – Published 29 November 2001
M. F. Hundley, J. L. Sarrao, J. D. Thompson, R. Movshovich, M. Jaime, C. Petrovic, and Z. Fisk

Abstract

We report the thermodynamic, magnetic, and electronic transport properties of the ternary intermetallic system (Ce, La)3Pt4In13. Ce3Pt4In13 orders antiferromagnetically at 0.95 K, while the nonmagnetic compound La3Pt4In13 is a conventional 3.3-K superconductor. Kondo lattice effects appear to limit the entropy associated with the Néel transition to (1/4)R ln 2 as an electronic contribution to the specific heat of γ1 J/mole Ce K2 is observed at TN; roughly 35% of this γ survives the ordering transition. Hall effect, thermoelectric power, and ambient-pressure resistivity measurements confirm this interpretation. These results suggest that RKKY and Kondo interactions are closely balanced in this compound (TNTK). Contrary to expectations based on the Doniach Kondo necklace model, applied hydrostatic pressure modestly enhances the magnetic ordering temperature with dTN/dP=+23 mK/kbar. As such Ce3Pt4In13 provides a counterexample to Kondo systems with similar Kondo and RKKY energy scales, wherein applied pressure enhances TK at the expense of the ordered magnetic state.

DOI: http://dx.doi.org/10.1103/PhysRevB.65.024401

  • Received 9 April 2001
  • Revised 17 July 2001
  • Published 29 November 2001

© 2001 The American Physical Society

Authors & Affiliations

M. F. Hundley, J. L. Sarrao, J. D. Thompson, R. Movshovich, and M. Jaime

  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545

C. Petrovic* and Z. Fisk

  • National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310

  • *Present address: Ames Laboratory, Iowa State University, Ames, Iowa, 50011

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