Polaron melting and ordering as key mechanisms for colossal resistance effects in manganites.

Ch. Jooss, L. Wu, T. Beetz, R. F. Klie, M Beleggia, M. A. Schofield, S. Schramm, J. Hoffmann, Y. Zhu

Research output: Contribution to journalJournal articleResearchpeer-review


Polarons, the combined motion of electrons in a cloth of their lattice distortions, are a key transport feature in doped manganites. To develop a profound understanding of the colossal resistance effects induced by external fields, the study of polaron correlations and the resulting collective polaron behavior, i.e., polaron ordering and transition from polaronic transport to metallic transport is essential. We show that static long-range ordering of Jahn-Teller polarons forms a polaron solid which represents a new type of charge and orbital ordered state. The related noncentrosymmetric lattice distortions establish a connection between colossal resistance effects and multiferroic properties, i.e., the coexistence of ferroelectric and antiferromagnetic ordering. Colossal resistance effects due to an electrically induced polaron solid-liquid transition are directly observed in a transmission electron microscope with local electric stimulus applied in situ using a piezo-controlled tip. Our results shed light onto the colossal resistance effects in magnetic field and have a strong impact on the development of correlated electron-device applications such as resistive random access memory (RRAM).
Original languageEnglish
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number34
Pages (from-to)13597-13602
Number of pages6
Publication statusPublished - 2007
Externally publishedYes

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