Reentrant magnetism at the borderline between long-range antiferromagnetic order and spin-glass behavior in the B -site disordered perovskite system C a2-x S rxFeRu O6
Naveen K, Reehuis M, Adler P, Pattison P, Hoser A, Mandal TK, Arjun U, Mukharjee PK, Nath R, Felser C, Paul AK (2018)
Publication Type: Journal article
Publication year: 2018
Journal
Book Volume: 98
Article Number: 224423
Journal Issue: 22
DOI: 10.1103/PhysRevB.98.224423
Abstract
We report on the coexistence of magnetic order and disorder in the atomically disordered double perovskites Ca2FeRuO6 and CaSrFeRuO6. Powder x-ray and neutron diffraction were used to investigate the crystal structure and magnetic ordering of these oxides. Both compounds are described by the orthorhombic space group Pbnm down to 3 K, where the B site is found to be statistically occupied by Fe3+ and Ru5+ ions. The compound Ca2FeRuO6 shows a G-type antiferromagnetic ordering at TN≈220K, where the moments are aligned parallel to the c axis. The exchange of Ca by Sr suppresses long-range ordering in this system with the consequence that CaSrFeRuO6 shows a diffuse scattering pattern, indicating only the presence of a short-range order of the magnetic moments. Mössbauer measurements additionally reveal the coexistence of a long-range ordered and paramagnetic phase in Ca2FeRuO6, and spin-glass behavior in CaSrFeRuO6. The random occupancy of iron and ruthenium atoms at the B site gives rise to locally varying competing magnetic exchange interactions, which favors the emergence of reentrant magnetism with a spin-glass-like transition at Tf≈87K for Ca2FeRuO6 and a spin-glass transition at ∼65K for CaSrFeRuO6, as evidenced by frequency dependent ac susceptibility measurements. Our results are an interesting example for crossing the borderline between antiferromagnetism and spin-glass behavior in a 3d-4d hybrid perovskite system by modifying the structural distortion associated to the tolerance factor of the perovskite structure rather than changing the concentration of magnetic ions.
Involved external institutions
National Institute of Technology Kurukshetra
India (IN)
Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
Germany (DE)
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
European Synchrotron Radiation Facility (ESRF)
France (FR)
Indian Institute of Technology Roorkee (IIT Roorkee)
India (IN)
Indian Institute of Science Education and Research (IISER) Kolkata
India (IN)
India (IN)
Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
Germany (DE)
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
European Synchrotron Radiation Facility (ESRF)
France (FR)
Indian Institute of Technology Roorkee (IIT Roorkee)
India (IN)
Indian Institute of Science Education and Research (IISER) Kolkata
India (IN)
How to cite
APA:
Naveen, K., Reehuis, M., Adler, P., Pattison, P., Hoser, A., Mandal, T.K.,... Paul, A.K. (2018). Reentrant magnetism at the borderline between long-range antiferromagnetic order and spin-glass behavior in the B -site disordered perovskite system C a2-x S rxFeRu O6. Physical Review B, 98(22). https://doi.org/10.1103/PhysRevB.98.224423
MLA:
Naveen, Kumari, et al. "Reentrant magnetism at the borderline between long-range antiferromagnetic order and spin-glass behavior in the B -site disordered perovskite system C a2-x S rxFeRu O6." Physical Review B 98.22 (2018).
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