We report on anomalies in the dielectric and optical phonon spectra in bulk orthorhombic distorted perovskite LaCrO3 near an antiferromagnetic transition at 290 K. These anomalies were tracked using temperature dependent (200 K-320 K) dielectric and Raman spectroscopy. We observed a blue-shift for the B3g(3) optical phonon mode coincident with the onset of antiferromagnetic ordering of LaCrO3 in conjunction with a broad dielectric anomaly near the Néel temperature. The dielectric and optical phonon anomalies are discussed in the context of the observed antiferromagnetic transition in temperature dependent magnetic studies. © 2013 AIP Publishing LLC.

Mamidanna Sri Ramachandra Rao

Department Of Physics

Antiferromagnetic orderings

Antiferromagnetic transition

Dielectric anomaly

Magnetic studies

MAGNETODIELECTRICS

Near room temperature

Optical phonon modes

Temperature dependent

Antiferromagnetism

Phonons

Fulltext

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Dielectric and optical phonon anomalies near antiferromagnetic ordering in LaCrO3: A possible near room temperature magnetodielectric system

Applied Physics Letters

We studied magnetic properties of bulk LaCrO3; a GdFeO3-type distorted perovskite, with a predominant antiferromagnetic phase transition at ∼290 K. The bulk LaCrO3 exhibits intrinsic weak ferro magnetism at room temperature, which may arise due to the tilting of CrO6 octahedra, resulting in a non-zero net magnetic moment, as confirmed from the magnetization measurements. A broad magnetically-induced entropy change (-ΔS) is observed with the maxima at 290 K, close to room temperature in LaCrO3 system. © 2015 IOP Publishing Ltd.

Materials Research Express

Magnetostructural and magnetocaloric properties of bulk LaCrO3 system

Erbium orthochromite, ErCrO3, is a distorted-perovskite which has antiferromagnetic ground state below 10K and Cr3+ magnetic moments order at 133 K. The temperature dependence of magnetization is studied across different magnetic phases for ErCrO3 and different magnetization isotherms are analyzed. In the presence of external magnetic field, polycrystalline ErCrO3 develops weak ferromagnetism from antiferromagnetic ground state. These magnetic phase transitions are observed to be of first order which is justified by thermal hysteresis and Arrott-plots. © 2014 IOP Publishing Ltd.

Magnetic phases of erbium orthochromite

First principle calculations are carried out to investigate the ground state electronic and magnetic properties of G-type antiferromagnetic (AFM) LaCrO3 compound in orthorhombic phase. The orthorhombic LaCrO3, a distorted GdFeO3 - type perovskite exhibits AFM transition at ~290 K. Additionally; this system shows weak ferromagnetism at room temperature, in conjugation with its semiconducting properties. In this paper, we will discuss the onset of weak ferromagnetism and electronic properties of LaCrO3, implementing generalized gradient approximation for exchange correlation potential. We present results for electronic structure and density of states, including the effect of onsite Coulomb interaction and non-collinear arrangement of Cr&lt;sup&gt;3+&lt;/sup&gt; magnetic ions in G-type AFM geometry. © (2012) Trans Tech Publications, Switzerland.

Advanced Materials Research

Ground state electronic and magnetic properties of LaCrO3 system

Physical Review Letters

Magnetic Structure ofLaCrO3Perovskite under High Pressure fromIn SituNeutron Diffraction

Journal of Physics: Condensed Matter

Development of electrical polarization at an antiferromagnetic transition in FeVO4

Progress in Solid State Chemistry

Magnetodielectric effects at magnetic ordering transitions

Physical Review B

Origin of the light green color and electronic ground state ofLaCrO3

Journal	Applied Physics Letters
ISSN	00036951
Open Access	No