Metal-insulator phase transitions of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">SmNiO</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span> and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">PrNiO</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow><mo>:</mo></math></span> Electrons in a polaronic medium

María Andrea Mroginski; Néstor E. Massa; Horacio Salva; José Antonio Alonso; María Jesús Martínez-Lope

doi:10.1103/PhysRevB.60.5304

Metal-insulator phase transitions of ${SmNiO}_{3}$ and ${PrNiO}_{3} :$ Electrons in a polaronic medium

María Andrea Mroginski, Néstor E. Massa, Horacio Salva, José Antonio Alonso, and María Jesús Martínez-Lope

Phys. Rev. B 60, 5304 – Published 15 August 1999

Abstract

Temperature dependence of reflectivity and transmission infrared spectra and photoinduced activity of $R {NiO}_{3}$ $(R = Sm,$ Pr) were studied in order to elucidate the mechanism responsible for the metal-insulator transition at $T_{MI} \approx 135 K$ and ≈403 K, respectively. The reflectivity analysis and the agreement found between the small polaron theory and experimental conductivity allowed us to point out the electron-phonon interaction strength and therefore confirm the determinant participation of phonons in the transport properties of $R {NiO}_{3}$ $(R = \Pr,$ Sm). According to this, the metal-insulator transition at $T_{MI}$ is directly related to self-trapped electrons in a polaronic medium.

Received 22 January 1999

DOI:https://doi.org/10.1103/PhysRevB.60.5304

Authors & Affiliations

María Andrea Mroginski^*

Departamento de Física, Universidad Nacional del Nordeste, Avenida Libertad 5600, (3400) Corrientes, Argentina

Néstor E. Massa^†

Laboratorio Nacional de Investigación y Servicios en Espectroscopía Optica, Centro CEQUINOR–Departamento de Química and Departamento de Física, Universidad Nacional de La Plata, C.C. 962, (1900) La Plata, Argentina

Horacio Salva

Comisión Nacional de Energía Atómica, Centro Atómico Bariloche and Instituto Balseiro, (8400) Bariloche, Rio Negro, Argentina

José Antonio Alonso and María Jesús Martínez-Lope

Instituto de Ciencias de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, E-28049 Madrid, Spain

^*Present address: Max Planck Institut für Strahlenchemie, Stiftstrasse 34-36, D-45470 Mülheim, Germany.
^†Electronic address: nem@nahuel.biol.unlp.edu.ar

References (Subscription Required)

Click to Expand

Issue

Vol. 60, Iss. 8 — 15 August 1999

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review B

covering condensed matter and materials physics