Phonons and magnetic excitation correlations in weak ferromagnetic YCrO{sub 3}

Journal Article · Wed May 14 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4875099· OSTI ID:22275553

Sharma, Yogesh; Sahoo, Satyaprakash; Perez, William; Mukherjee, Somdutta ^[1]; Gupta, Rajeev ^[1]; Garg, Ashish ^[2]; Chatterjee, Ratnamala ^[3]

---

1. Department of Physics, Indian Institute of Technology, Kanpur (India)
2. Department of Materials Science and Engineering, Indian Institute of Technology, Kanpur (India)
3. 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

Related Subjects

75 CONDENSED MATTER PHYSICS
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