Tuning the magnetic and structural phase transitions of PrFeAsO via Fe/Ru spin dilution

Yuen Yiu, Pietro Bonfà, Samuele Sanna, Roberto De Renzi, Pietro Carretta, Michael A. McGuire, Ashfia Huq, and Stephen E. Nagler
Phys. Rev. B 90, 064515 – Published 25 August 2014

Abstract

Neutron diffraction and muon spin relaxation measurements are used to obtain a detailed phase diagram of PrFe1xRuxAsO. The isoelectronic substitution of Ru for Fe acts effectively as spin dilution, suppressing both the structural and magnetic phase transitions. The temperature TS of the tetragonal-orthorhombic structural phase transition decreases gradually as a function of x. Slightly below TS, coherent precessions of the muon spin are observed corresponding to static magnetism, possibly reflecting a significant magnetoelastic coupling in the FeAs layers. Short-range order in both the Fe and Pr moments persists for higher levels of x. The static magnetic moments disappear at a concentration coincident with that expected for percolation of the J1J2 square-lattice model.

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  • Received 11 July 2014
  • Revised 7 August 2014

DOI:https://doi.org/10.1103/PhysRevB.90.064515

©2014 American Physical Society

Authors & Affiliations

Yuen Yiu1,*, Pietro Bonfà2, Samuele Sanna3, Roberto De Renzi2, Pietro Carretta3, Michael A. McGuire4, Ashfia Huq5, and Stephen E. Nagler1,6,7

  • 1Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
  • 2Department of Physics and Earth Sciences, University of Parma, 43124 Parma, Italy
  • 3Department of Physics, University of Pavia, 27100 Pavia, Italy
  • 4Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
  • 5Chemical and Engineering Materials Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
  • 6Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
  • 7CIRE, University of Tennessee, Knoxville, TN 37996, USA

  • *yyiu@utk.edu

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Issue

Vol. 90, Iss. 6 — 1 August 2014

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