News


Dr. Ram S. Katiyar's article has been included to the special 50th Anniversary edition of Applied Physics Letters.

10/03/ 2012

http://apl.aip.org/resource/1/applab/v97/i20/p202910_s1?view=fulltext

The article "Near-room temperature relaxor multiferroic" published by Dr. Ram S. Katiyar's group of the Physics Department has been included to the special 50th Anniversary edition of Applied Physics Letters’ “Editor’s Picks”, as one of the most notable APL articles published in recent years. The article was co-authored by Dilsom A. Sanchez, Arun Kumar, Nora Ortega, Ram S. Katiyar, and James F. Scott.

The authors report the fabrication and characterization of highly oriented Pb(Zr0.53Ti0.47)0.60(Fe0.5Ta0.5)0.40O3 thin films. Dielectric spectra showed a maximum (Tm) around 350 K for 1 kHz that shifted to higher temperatures (by ? 30?K) with an increase in frequency up to 1 MHz. High dielectric dispersion below and above Tm, low dielectric loss (2%–5%), high dielectric constant ( ?1380@1?kHz), ferroelectric polarization, and weak magnetic moment are observed. Real and imaginary dielectric data were fitted with a nonlinear Vogel–Fulcher equation, implying a relaxor nature. The ac conductivity shows frequency-dependent conductivity, low loss, and frequency-dependent kinks near Tm.