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.
Tuning the magnetic and structural phase transitions of PrFeAsO via Fe/Ru spin dilution / Yiu, Yuen; Bonfa', Pietro; Sanna, Samuele; De Renzi, Roberto; Carretta, Pietro; Mcguire, Michael A.; Huq, Ashfia; Nagler, Stephen E.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 90:6(2014), p. 064515. [10.1103/PhysRevB.90.064515]
Tuning the magnetic and structural phase transitions of PrFeAsO via Fe/Ru spin dilution
BONFA', Pietro;
2014
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.
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