Unsaturated magnetoconductance of epitaxial La0.7Sr0.3MnO3 thin films in pulsed magnetic fields up to 60 T

Wei Niu,Fengqi Song,Ming Gao,Rong Zhang,Zhengcai Xia,Xuefeng Wang,Yongbing Xu,Yuefeng Nie,Jun Du

doi:10.1063/1.4972853

Abstract

We report on the temperature and field dependence of resistance of La0.7Sr0.3MnO3 thin films over a wide temperature range and in pulsed magnetic fields up to 60 T. The epitaxial La0.7Sr0.3MnO3 thin films were deposited by laser molecular beam epitaxy. High magnetic field magnetoresistance curves were fitted by the Brillouin function, which indicated the existence of magnetically polarized regions and the underlying hopping mechanism. The unsaturated magnetoconductance was the most striking finding observed in pulsed magnetic fields up to 60 T. These observations can deepen the fundamental understanding of the colossal magnetoresistance in manganites with strong correlation of transport properties and magnetic ordering.

Highlights

Since the observation of colossal magnetoresistance (CMR) in doped manganite perovskites,[1] there has been a recent surge of research in order to understand the strong correlation of resistance and magnetic ordering in these materials.[2,3,4]
The strong coupling between electrical and magnetic orderings leads to the sophisticated physical phases in manganites.[3,4,5]
LSMO film in pulsed magnetic fields up to 60 T. (a),(b) Field-dependent magnetoresistance of epitaxial LSMO film measured under the magnetic fields which are in-plane ( | |) and out-plane (⊥), respectively. (c) Temperature dependence of the effective spin moment J for LSMO film. (d) Field dependence of G measured for epitaxial LSMO film at various temperatures, and normalized to the zero field value G0, showing unsaturated behavior up to 60 T

Summary

Introduction

Unsaturated magnetoconductance of epitaxial La0.7Sr0.3MnO3 thin films in pulsed magnetic fields up to 60 T For magnetoresistance measurements in pulsed magnetic fields up to 60 T and discuss the transport and magnetic properties of epitaxial LSMO films measured between 2 and 300 K.

Results

Conclusion