Nanoscale ordering and multiferroic behavior in Pb(Fe1/2Ta1/2)O-3

R. Martinez*, R. Palai, H. Huhtinen, J. Liu, J. F. Scott, R. S. Katiyar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

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.

Original languageEnglish
Article number134104
Number of pages10
JournalPhysical Review. B, Condensed matter and materials physics
Volume82
Issue number13
DOIs
Publication statusPublished - 5 Oct 2010

Keywords

  • SINGLE-CRYSTALS
  • MAGNETIC PROPERTIES
  • PEROVSKITES
  • PBFE0.5TA0.5O3

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