Pressure-Induced Quenching of the Jahn-Teller Distortion and Insulator-to-Metal Transition in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>LaMnO</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span>

I. Loa; P. Adler; A. Grzechnik; K. Syassen; U. Schwarz; M. Hanfland; G. Kh. Rozenberg; P. Gorodetsky; M. P. Pasternak

doi:10.1103/PhysRevLett.87.125501

Pressure-Induced Quenching of the Jahn-Teller Distortion and Insulator-to-Metal Transition in ${LaMnO}_{3}$

I. Loa, P. Adler, A. Grzechnik, K. Syassen, U. Schwarz, M. Hanfland, G. Kh. Rozenberg, P. Gorodetsky, and M. P. Pasternak

Phys. Rev. Lett. 87, 125501 – Published 28 August 2001

Abstract

${LaMnO}_{3}$ was studied by synchrotron x-ray diffraction, optical spectroscopies, and transport measurements under pressures up to 40 GPa. The cooperative Jahn-Teller (JT) distortion is continuously reduced with increasing pressure. There is strong indication that the JT effect and the concomitant orbital order are completely suppressed above 18 GPa. The system, however, retains its insulating state to $\sim 32 GPa$ , where it undergoes a bandwidth-driven insulator-metal transition. Delocalization of electron states, which suppresses the JT effect but is insufficient to make the system metallic, appears to be a key feature of ${LaMnO}_{3}$ at 20–30 GPa.

Received 2 April 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.125501

Authors & Affiliations

I. Loa¹, P. Adler¹, A. Grzechnik¹, K. Syassen¹, U. Schwarz², M. Hanfland³, G. Kh. Rozenberg⁴, P. Gorodetsky⁴, and M. P. Pasternak⁴

¹Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
²Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Strasse 40, D-01187 Dresden, Germany
³European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France
⁴School of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv, Israel