Polaronic transport induced by competing interfacial magnetic order in a La 0.7 Ca 0.3 MnO 3 /BiFeO 3 heterostructure

Yu-Miin Sheu*, S. A. Trugman, L. Yan, J. Qi, Q. X. Jia, A. J. Taylor, R. P. Prasankumar

*Corresponding author for this work

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Using ultrafast optical spectroscopy, we show that polaronic behavior associated with interfacial antiferromagnetic order is likely the origin of tunable magnetotransport upon switching the ferroelectric polarity in a La 0.7 Ca 0.3 MnO 3 /BiFeO 3 (LCMO/BFO) heterostructure. This is revealed through the difference in dynamic spectral weight transfer between LCMO and LCMO/BFO at low temperatures, which indicates that transport in LCMO/BFO is polaronic in nature. This polaronic feature in LCMO/BFO decreases in relatively high magnetic fields due to the increased spin alignment, while no discernible change is found in the LCMO film at low temperatures. These results thus shed new light on the intrinsic mechanisms governing magnetoelectric coupling in this heterostructure, potentially offering a new route to enhancing multiferroic functionality.

Original languageEnglish
Article number021001
JournalPhysical Review X
Volume4
Issue number2
DOIs
StatePublished - 1 Jan 2014

Keywords

  • Condensed matter physics
  • Magnetism
  • Strongly correlated materia

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