Magnetization-steps in Y₂CoMnO₆ double perovskite: The role of antisite disorder
- Jülich Center for Neutron Sciences-2/Peter Grünberg Institute-4, Forschungszentrum Jülich GmbH, 52425 Jülich (Germany)
- Low Temperature Physics Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai 600036 (India)
- Department of Physics, Indian Institute of Science, C. V. Raman Avenue, Bangalore 560012 (India)
- Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9 (France)
Antisite disorder is observed to have significant impact on the magnetic properties of the double perovskite Y²CoMnO₆ which has been recently identified as a multiferroic. A paramagnetic-ferromagnetic phase transition occurs in this material at Tc ≈ 75 K. At 2 K, it displays a strong ferromagnetic hysteresis with a significant coercive field of Hc ≈ 15 kOe. Sharp steps are observed in the hysteresis curves recorded below 8 K. In the temperature range 2 K ≤ T ≤ 5 K, the hysteresis loops are anomalous as the virgin curve lies outside the main loop. The field-cooling conditions as well as the rate of field-sweep are found to influence the steps. Quantitative analysis of the neutron diffraction data shows that at room temperature, Y₂CoMnO₆ consists of 62% of monoclinic P2₁/n with nearly 70% antisite disorder and 38% Pnma. The bond valence sums indicate the presence of other valence states for Co and Mn which arise from disorder. We explain the origin of steps by using a model for pinning of magnetization at the antiphase boundaries created by antisite disorder. The steps in magnetization closely resemble the martensitic transformations found in intermetallics and display first-order characteristics as revealed in the Arrott's plots.
- OSTI ID:
- 22305710
- Journal Information:
- Journal of Applied Physics, Vol. 116, Issue 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COBALT COMPOUNDS
FERROMAGNETISM
INTERMETALLIC COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIZATION
MANGANATES
MONOCLINIC LATTICES
NEUTRON DIFFRACTION
PARAMAGNETISM
PEROVSKITE
PHASE TRANSFORMATIONS
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
YTTRIUM COMPOUNDS