A1 Refereed original research article in a scientific journal
Nanoscale ordering and multiferroic behavior in Pb(Fe1/2Ta1/2)O-3
Authors: Martinez R, Palai R, Huhtinen H, Liu J, Scott JF, Katiyar RS
Publisher: AMER PHYSICAL SOC
Publication year: 2010
Journal: Physical Review B
Journal name in source: PHYSICAL REVIEW B
Journal acronym: PHYS REV B
Article number: ARTN 134104
Number in series: 13
Volume: 82
Issue: 13
Number of pages: 10
ISSN: 1098-0121
DOI: https://doi.org/10.1103/PhysRevB.82.134104
Abstract
We report on structural, microstructural, dielectric, electrical, magnetic, and spectroscopic (Raman and terahertz) properties of lead iron tantalate Pb(Fe1/2Ta1/2)O-3 ceramics. Raman spectroscopy revealed the presence of nanoscale ordering though it is forbidden in bulk by crystal symmetry. The dielectric properties of Pb(Fe1/2Ta1/2)O-3 show a typical relaxor ferroelectric behavior with long-range disorder while the magneto-electric properties show an interesting multiferroic behavior (coexistence of ferroelectric and magnetic order) in the same phase. The temperature variation in field cooled magnetization shows anomalies at about 55(+/- 5) and 180(+/- 5) K indicating the existence of two Neel temperatures in agreement with theoretical predictions. The zero-field-cooled magnetization as a function temperature and field reveals the existence of spin-glasslike behavior at low temperature like single crystal. The electrical conduction behavior satisfies the modified Schottky equation of Simmons at all fields. The ac conductivity as a function of frequency shows an excellent fit to the universal power law. Terahertz spectroscopy shows an opaque nature of Pb(Fe1/2Ta1/2)O-3 in midin-frared and far-infrared wavelengths.
We report on structural, microstructural, dielectric, electrical, magnetic, and spectroscopic (Raman and terahertz) properties of lead iron tantalate Pb(Fe1/2Ta1/2)O-3 ceramics. Raman spectroscopy revealed the presence of nanoscale ordering though it is forbidden in bulk by crystal symmetry. The dielectric properties of Pb(Fe1/2Ta1/2)O-3 show a typical relaxor ferroelectric behavior with long-range disorder while the magneto-electric properties show an interesting multiferroic behavior (coexistence of ferroelectric and magnetic order) in the same phase. The temperature variation in field cooled magnetization shows anomalies at about 55(+/- 5) and 180(+/- 5) K indicating the existence of two Neel temperatures in agreement with theoretical predictions. The zero-field-cooled magnetization as a function temperature and field reveals the existence of spin-glasslike behavior at low temperature like single crystal. The electrical conduction behavior satisfies the modified Schottky equation of Simmons at all fields. The ac conductivity as a function of frequency shows an excellent fit to the universal power law. Terahertz spectroscopy shows an opaque nature of Pb(Fe1/2Ta1/2)O-3 in midin-frared and far-infrared wavelengths.
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