Competing orders, competing anisotropies, and multicriticality: The case of Co-doped YbRh2Si2

Eric C. Andrade, Manuel Brando, Christoph Geibel, and Matthias Vojta
Phys. Rev. B 90, 075138 – Published 22 August 2014

Abstract

Motivated by the unusual evolution of magnetic phases in stoichiometric and Co-doped YbRh2Si2, we study Heisenberg models with competing ferromagnetic and antiferromagnetic ordering combined with competing anisotropies in exchange interactions and g factors. Utilizing large-scale classical Monte Carlo simulations, we analyze the ingredients required to obtain the characteristic crossing point of uniform susceptibilities observed experimentally near the ferromagnetic ordering of Yb(Rh0.73Co0.27)2Si2. The models possess multicritical points, which we speculate to be relevant for the behavior of clean as well as doped YbRh2Si2. We also make contact with experimental data on YbNi4P2, where a similar susceptibility crossing has been observed.

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  • Received 20 December 2013
  • Revised 11 August 2014

DOI:https://doi.org/10.1103/PhysRevB.90.075138

©2014 American Physical Society

Authors & Affiliations

Eric C. Andrade1,2, Manuel Brando3, Christoph Geibel3, and Matthias Vojta1

  • 1Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany
  • 2Instituto de Física Teórica, Universidade Estadual Paulista, Rua Dr. Bento Teobaldo Ferraz, 271 - Bl. II, 01140-070, São Paulo, SP, Brazil
  • 3Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany

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Vol. 90, Iss. 7 — 15 August 2014

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