Structural and magnetic properties of single layered manganite Pr0.5Ca1.5MnO4

ORAL

Abstract

High resolution neutron powder diffraction and elastic neutron scattering have been used to determine the lattice and magnetic structure of the single layer manganite Pr0.5Ca1.5MnO4. The system becomes charge/orbital ordered (CO-OO) near 300K and antiferromagnetically ordered with a Neel temperature ($T_N$) near 125K, which has CE-type (checkerboard like) structure in the Mn-O plane. At temperatures above $T_N$ but below $T_{CO-OO} $, we discovered an anomalous lattice response around 160K. We discuss the microscopic origin of this lattice distortion and its association with competing CO-OO and antiferromagnetic states.

*The work was supported by NSF-DMR0453804 and DOE DE-FG02-05ER46202. ORNL is managed by UT-Battelle, LLC, for the U.S. Dept. of Energy under contract DE-AC05-00OR22725. This work was also performed under the US-Japan Cooperative Program on Neutron Scatteri

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Authors

  • Songxue Chi

    • University of Tennessee, Knoxville
    • Univ. of Tennessee

  • Pengcheng Dai

    • University of Tennessee, Knoxville

  • Feng Ye

    • Oak Ridge National Laboratory
    • Center for Neutron Scattering, Oak Ridge National Laboratory

  • Jaime Fernandez-Baca

    • Oak Ridge National Laboratory
    • ORNL
    • ORNL and Univ. of Tennessee

  • R. Mathieu

    • University of Tokyo
    • Univ. of Tokyo

  • Y. Tokura

    • University of Tokyo
    • Univ. of Tokyo and CERC, Japan
    • Univ. of Tokyo

  • Qing Huang

    • NIST Center for Neutron Scattering

  • J. W. Lynn

    • NIST Center for Neutron Scattering
    • NIST