2002/04/04 by Bas B. Van Aken, Auke Meetsma, Oana D. Jurchescu +4 · 2 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Chemistry #Condensed matter physics #Crystallography #Insulator (electricity) #Magnetic and transport properties of perovskites and related materials #Materials science #Metal #Metal–insulator transition #Order (exchange) #Physics #Rare-earth and actinide compounds #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.90.066403
published as Phys. Rev. Lett. 90, 066403 (2003) · 5 pages, including 5 figures
arxiv created 2002/04/04 · openalex publication_date 2003/02/14 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We present evidence that the insulator-to-metal transition in La_1\ensuremath-xCaxMnO3 near x\ensuremath∼0.2 is driven by the suppression of coherent Jahn-Teller distortions, originating from d-type orbital ordering. The orbital-ordered state is characterized by large long-range Q2 distortions below T_O^\ensuremath'\mathrm\text\ensuremath-O*. Above T_O^\ensuremath'\mathrm\text\ensuremath-O* we find evidence for coexistence between an orbital-ordered and an orbital-disordered state. This behavior is discussed in terms of electronic phase separation in an orbital-ordered insulating and an orbital-disordered metallic state.