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Quasiquartet crystal-electric-field ground state with possible quadrupolar ordering in the tetragonal compound YbRu2Ge2

H. S. Jeevan, C. Geibel, and Z. Hossain
Phys. Rev. B 73, 020407(R) – Published 13 January 2006

Abstract

We have investigated the magnetic properties of YbRu2Ge2 by means of magnetic susceptibility χ(T), specific heat C(T) and electrical resistivity ρ(T) measurements performed on flux-grown single crystals. The Curie-Weiss behavior of χ(T) along the easy plane, the large magnetic entropy at low temperatures and the weak Kondo-like increase in ρ(T) proves a stable trivalent Yb state. Anomalies in C(T), ρ(T), and χ(T) at T0=10.2K, T1=6.5K, and T2=5.7K evidence complex ordering phenomena. The magnetic entropy just above T0 amounts to almost Rln4, indicating that the crystal-electric-field (CEF) ground state is a quasiquartet instead of the expected doublet. The behavior at T0 is rather unusual and suggests that this transition is related to quadrupolar ordering, being a consequence of the CEF quasiquartet ground state. The combination of a quasiquartet CEF ground state, a high ordering temperature, and the relevance of quadrupolar interactions makes YbRu2Ge2 a rather unique system among Yb-based compounds.

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  • Received 9 December 2005

DOI:https://doi.org/10.1103/PhysRevB.73.020407

©2006 American Physical Society

Authors & Affiliations

H. S. Jeevan* and C. Geibel

  • Max Planck Institute for Chemical Physic of Solids, Nöthnitzer Strasse 40, D 01187 Dresden, Germany

Z. Hossain

  • Department of Physics, Indian Institute of Technology, Kanpur 208016, India

  • *Electronic address: jeevan@cpfs.mpg.de

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Issue

Vol. 73, Iss. 2 — 1 January 2006

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