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American Physical Society, Physical review B, 6(90)

DOI: 10.1103/physrevb.90.064515

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

Journal article published in 2014 by Yuen Yiu, Pietro Bonfa' ORCID, Pietro Bonfà, Samuele Sanna, Roberto De Renzi ORCID, Pietro Carretta, Michael A. McGuire, Ashfia Huq, Stephen E. Nagler
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Neutron diffraction and muon spin relaxation measurements are used to obtain a detailed phase diagram of PrFe1−xRuxAsO. 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 J1−J2 square-lattice model.