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Evolution of magnetism in Yb(Rh1xCox)2Si2

C. Klingner, C. Krellner, M. Brando, C. Geibel, F. Steglich, D. V. Vyalikh, K. Kummer, S. Danzenbächer, S. L. Molodtsov, C. Laubschat, T. Kinoshita, Y. Kato, and T. Muro
Phys. Rev. B 83, 144405 – Published 6 April 2011

Abstract

We present a study of the evolution of magnetism from the quantum critical system YbRh2Si2 to the stable trivalent Yb system YbCo2Si2. Single crystals of Yb(Rh1xCox)2Si2 were grown for 0x1 and studied by means of magnetic susceptibility, electrical resistivity, and specific heat measurements, as well as photoemission spectroscopy. The results evidence a complex magnetic phase diagram, with a nonmonotonic evolution of TN and two successive transitions for some compositions resulting in two tricritical points. The strong similarity with the phase diagram of YbRh2Si2 under pressure indicates that Co substitution basically corresponds to the application of positive chemical pressure. Analysis of the data proves a strong reduction of the Kondo temperature TK with increasing Co content, TK becoming smaller than TN for x0.5, implying a strong localization of the 4f electrons. Furthermore, low-temperature susceptibility data confirm a competition between ferromagnetic and antiferromagnetic exchange. The series Yb(Rh1xCox)2Si2 provides an excellent experimental opportunity to gain a deeper understanding of the magnetism at the quantum critical point in the vicinity of YbRh2Si2 where the antiferromagnetic phase disappears (TN0).

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  • Received 23 December 2010

DOI:https://doi.org/10.1103/PhysRevB.83.144405

©2011 American Physical Society

Authors & Affiliations

C. Klingner*, C. Krellner, M. Brando, C. Geibel, and F. Steglich

  • Max-Planck-Institute for Chemical Physics of Solids, D-01187 Dresden, Germany

D. V. Vyalikh, K. Kummer, S. Danzenbächer, S. L. Molodtsov, and C. Laubschat

  • Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany

T. Kinoshita, Y. Kato, and T. Muro

  • Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan

  • *Present address: Max Planck Institute of Biochemistry, D-82152 Martinsried, Germany.
  • krellner@cpfs.mpg.de

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Issue

Vol. 83, Iss. 14 — 1 April 2011

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