Signature of Magnetic Phase Separation in Pr$_{1-x}$Ca$_{x}$MnO$_{3}$.

ORAL

Abstract

Elastic neutron scattering has been used to study the evolution of the long-/short-range charge-orbital (CO-OO), ferromagnetic (FM), and antiferromagnetic (AF) correlations in the single crystals Pr$_{1-x}$Ca$_{x}$MnO$_{3}$ (x = 0.3, 0.35 and 0.4). In contrast with Pr$_{0.7}$Ca$_{0.3}$MnO$_{3}$ (PCMO30), both the long-range CO-OO and AF ordering show precipitous decrease in intensity below 30K, where the short-range FM clusters are formed in the Pr$_{0.65}$Ca$_{0.35}$MnO$_{3}$ (PCMO35). Those results provide clear evidence of magnetic phase separation. The doping dependence results of the short-range magnetic correlations indicate that there is a critical doping $x_{cr}$ (close to $x$ = 0.35) for the existence of phase separation in the CO-OO ground state.

*Supported by DOE DE-FG02-04ER46125. NSF DMR-0346826 and DMR-0453804

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Authors

  • Dalgis Mesa

    • Florida International University, Miami, FL 33199

  • Hao Sha

    • Department of Physics, Florida International University, Miami, FL 33199
    • Florida International University, Miami, FL 33199

  • Jiandi Zhang

    • Department of Physics, Florida International University, Miami, FL 33199
    • Florida International University, Miami, FL 33199
    • Florida International University
    • Florida International University (FIU), Miami, FL 33199

  • Feng Ye

    • Oak Ridge National Laboratory, Oak Ridge, TN 37831
    • Oak Ridge National Laboratory
    • ORNL

  • Pengcheng Dai

    • University of Tennessee, Knoxville, TN 37996;Oak Ridge National Laboratory, Oak Ridge, TN 37831
    • University of Tennessee, Knoxville
    • Department of Physics, University of Tennessee, Oak Ridge National Lab

  • J. A. Fernandez-Baca

    • University of Tennessee, Knoxville, TN 37996;Oak Ridge National Laboratory, Oak Ridge, TN 37831
    • Oak Ridge National Laboratory

  • J. W. Lynn

    • NIST Center of Neutron Research, Gaithersburg, MD 20899

  • Y. Tomioka

    • Correlated Electron Research Center, Tsukuba 305-0046, Japan

  • Yoshinori Tokura

    • University of Tokyo, Tokyo 113-8656, Japan
    • Correlated Electron Research Center, Tsukuba 305-0046, Japan;University of Tokyo, Tokyo 113-8656, Japan
    • University of Tokyo, Japan
    • Department of Applied Physics, University of Tokyo