Synthesis and study of the heavy-fermion compound Yb5Pt9

M. S. Kim, M. C. Bennett, D. A. Sokolov, M. C. Aronson, J. N. Millican, Julia Y. Chan, Q. Huang, Y. Chen, and J. W. Lynn
Phys. Rev. B 74, 224431 – Published 26 December 2006

Abstract

We report the synthesis of single crystals of a binary heavy-fermion system Yb5Pt9. An unusual double phase transition is observed in specific heat CP measurements at 0.6K and 0.65K, signaling a magnetically ordered ground state. The complete magnetic field-temperature phase diagram of Yb5Pt9 is obtained from the magnetic field dependence of the electrical resistivity ρ(T) and specific heat CP(T), and consists of two phase lines terminating at finite temperature critical endpoints. Electrical resistivity and specific heat measurements show that the magnetically ordered state is a Fermi liquid with strong electronic correlations, absent in the paramagnetic state. At higher temperatures, strong magnetic anisotropy is observed, which we ascribe to crystal electric field effects acting on a well localized Yb3+ moment, yielding a well separated doublet ground state, confirmed by inelastic neutron scattering measurements. Our measurements show that Yb5Pt9 is a heavy-fermion compound which is very near a quantum critical point.

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  • Received 29 June 2006

DOI:https://doi.org/10.1103/PhysRevB.74.224431

©2006 American Physical Society

Authors & Affiliations

M. S. Kim1, M. C. Bennett1, D. A. Sokolov1, M. C. Aronson1, J. N. Millican2, Julia Y. Chan2, Q. Huang3, Y. Chen3,4, and J. W. Lynn3

  • 1Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120, USA
  • 2Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
  • 3NIST Center for Neutron Research, NIST, Gaithersburg, Maryland 20899, USA
  • 4Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA

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Issue

Vol. 74, Iss. 22 — 1 December 2006

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