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; Stephen E. Nagler

doi:10.1103/PhysRevB.90.064515

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, Stephen E. Nagler

Correlated Electron Materials

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6 Scopus citations

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.

Original language	English
Article number	064515
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	90
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.90.064515
State	Published - Aug 25 2014

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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.",

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T1 - Tuning the magnetic and structural phase transitions of PrFeAsO via Fe/Ru spin dilution

AU - Yiu, Yuen

AU - Bonfà, Pietro

AU - Sanna, Samuele

AU - De Renzi, Roberto

AU - Carretta, Pietro

AU - McGuire, Michael A.

AU - Huq, Ashfia

AU - Nagler, Stephen E.

PY - 2014/8/25

Y1 - 2014/8/25

N2 - 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.

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

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