Phonons and magnetic excitation correlations in weak ferromagnetic YCrO{sub 3}
- Department of Physics, Indian Institute of Technology, Kanpur (India)
- Department of Materials Science and Engineering, Indian Institute of Technology, Kanpur (India)
- Department of Physics, Indian Institute of Technology, Delhi (India)
Here, we report the temperature dependent Raman spectroscopic studies on orthorhombically distorted perovskite YCrO{sub 3} over a temperature range of 20–300 K. Temperature dependence of DC-magnetization measurements under field cooled and zero field cooled protocols confirmed a Néel transition at T{sub N} ∼ 142 K. Magnetization isotherms recorded at 125 K show a clear loop opening without any magnetization saturation up to 20 kOe, indicating a coexistence of antiferromagnetic (AFM) and weak ferromagnetic (WFM) phases. Estimation of exchange constants using mean-field approximation further confirm the presence of a complex magnetic phase below T{sub N}. Temperature evolution of Raman line-shape parameters of the selected modes (associated with the octahedral rotation and A(Y)-shift in the unit-cell) reveal an anomalous phonon shift near T{sub N}. An additional phonon anomaly was identified at T{sup *} ∼ 60 K, which could possibly be attributed to the change in the spin dynamics. Moreover, the positive and negative shifts in Raman frequencies between T{sub N} and T{sup *} suggest competing WFM and AFM interactions. A close match between the phonon frequency of B{sub 3g} (3)-octahedral rotation mode with the square of sublattice magnetization between T{sub N} and T{sup *} is indicative of the presence of spin-phonon coupling in multiferroic YCrO{sub 3}.
- OSTI ID:
- 22275553
- Journal Information:
- Journal of Applied Physics, Vol. 115, Issue 18; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Temperature dependent Raman scattering in YCrO{sub 3}
Symmetry Breaking and Ascending in the Magnetic Kagome Metal FeGe
Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
APPROXIMATIONS
ATOMIC FORCE MICROSCOPY
CHROMATES
CORRELATIONS
ELECTRON-PHONON COUPLING
EXCITATION
FERROMAGNETISM
ISOTHERMS
MAGNETIZATION
MEAN-FIELD THEORY
PHONONS
RAMAN SPECTROSCOPY
ROTATION
TEMPERATURE DEPENDENCE
YTTRIUM COMPOUNDS