Abstract

A Pr0.6Sr0.4MnO3 powder was synthesized by the solid-state reaction method at 1400°C. Magnetic measurements show that our sample exhibits a paramagnetic-ferromagnetic transition with decreasing temperature. The paramagnetic to ferromagnetic transition is followed by a decrease of the magnetization below 100 K. The Curie temperature TC is found to be 310 K. Electrical studies show a semiconductor-metallic transition at Tρ=260 K. Our sample displays a magnetoresistance effect in 8 T of about 45% below 250 K. Neutron diffraction studies show that our sample crystallizes in the orthorhrombic system with Pnma space group at room temperature and at 200 K. However, at 10 K, we observe the coexistence of two phases: an orthorhombic phase with Pnma space group (27%) and a monoclinic one with 12/a space group (73%). 55Mn NMR measurements at 4.2 confirm the metallic behavior at low temperature. The observed frequency of 380 MHz is close to the calculated frequency of 378 MHz, which confirms the average value of Mn4+ and Mn3+ resonance frequencies. © 2002 Elsevier Science B.V. All rights reserved.

Department(s)

Physics

Keywords and Phrases

Electric transport; Magnetic measurements; Neutron diffraction; Oxide materials; Transition metal compounds

International Standard Serial Number (ISSN)

0925-8388

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Elsevier, All rights reserved.

Publication Date

28 Feb 2002

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