Photomagnetic behavior and infrared spectroscopy of rare-earth doped La 0.7 Sr 0.3 MnO 3
- PDF / 1,994,836 Bytes
- 7 Pages / 432 x 648 pts Page_size
- 100 Downloads / 188 Views
MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.85
Photomagnetic behavior and infrared spectroscopy of rare-earth doped La0.7Sr0.3MnO3 Ricardo Martínez1, Hannu Huhtinen2, Wojciech Jadwisienczak3 and Ratnakar Palai1 1
Department of Physics, University of Puerto Rico, Rio Piedras, San Juan, PR, 00931, USA
2 Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, Turku FIN20014, Finland
3
School of Electrical Engineering and Computer Science, Ohio University, Stocker Center, Athens, 45701, USA
Abstract
We report on photo-induced magnetic effect and infrared (IR) spectroscopic behavior of colossal magnetorestive manganite La0.7Sr0.3MnO3 (LSMO) with rare earth co-doping (Er3+ and Yb3) at room temperature. X-ray diffraction shows that a structural phase transformation from rhombohedral to hexagonal with increasing Er and Yb concentrations. Photo-induced magnetoresistance showed that Er3+ and Yb+3 ions have significant influence on the magnetic and electrical ordering of LSMO under the influence of UV light. The optical excitation also shows an enhancement in the magnetotransport properties of LSMO.
INTRODUCTION Perovskite manganites with the general formula R1−xAxMnO3 (R-rare earth trivalent cation and A-divalent cation) have been revisited in recent years due to their interesting magnetoelectronic properties [1]. They exhibit a complex range of phases including metallic ferromagnetic, insulating antiferromagnetic, charge and orbital ordering [2], and negative colossal magnetoresistance (CMR) near magnetic transition. Of late, interesting investigations on photo-induced effects have been reported for manganites, such as La0.9Ca0.1MnO3 [3] and Pr0.6La0.1Ca0.3MnO3 [4]. In Pr0.7Ca0.3MnO3, it has been demonstrated the light-induced antiferromagnetic-ferromagnetic phase transition by selective excitation of phonon modes [5,6]. Light resonant to IR active
559
Downloaded from https://www.cambridge.org/core. Columbia University Libraries, on 12 Aug 2019 at 11:53:49, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/adv.2019.85
vibrations have also been used to control the magnetic, metallic, and orbital properties in La0.5Sr1.5MnO4. La0.7Sr0.3MnO3 (LSMO) is a highly spin polarized materials with room temperature ferromagnetism. Trivalent rare earths (Er3+ and Yb3+) exhibit fascinating spectroscopic, luminescent, and magnetic properties [7,8]. REs also have higher magnetic moments (Er3+ = 9.59PB and Yb3+= 4.5PB) than transition metals. In order to study the multifunctional effect in LSMO, it has been co-doped with Er and Yb different concentrations of RE (10%, 20% and 30%) at the La-site. The present work, reports the effect of UV light irradiation on the magnetic and electronic properties of LSMO. EXPERIMENTAL DETAILS The manganite oxides La0.7-xErx/2Ybx/2Sr0.3MnO3 were prepared as polycrystalline ceramic powders with various compositions [x=0 (S1), 0.1 (S2), 0.2 (S3) and 0.3 (S4)] by solid state re
Data Loading...
