Helimagnetism in Cr doped FeGe

ORAL

Abstract

We have studied helimagnetism in Fe(1-x)Cr(x)Ge via bulk magnetic measurements and Small Angle Neutron Scattering (SANS). Cubic FeGe exhibits helimagnetism below Tc = 276 K. This transition is suppressed by Cr doping, and cannot be detected above 4K for x = 0.4 or greater. SANS measurements for samples with x = 0.1, 0.2, and 0.3 shows clear evidence for helimagnetic structures with characteristic periods of several hundred angstroms. The x = 0.2 and 0.3 samples show a hump in the susceptibility accompanied by an anomaly in the SANS signal at a temperature below the onset of helimagnetic order.

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Authors

  • Yuen Yiu

    • Univ of Tennessee, Knoxville
    • Department of Physics, University of Tennessee, Knoxville TN 37996 USA

  • Nirmal Ghimire

    • Univ of Tennessee, Knoxville
    • University of Tennessee, Oak Ridge National Laboratory
    • Los Alamos National Laboratory

  • L. DeBeer-Schmitt

    • Oak Ridge Natl Lab
    • Oak Ridge National Laboratory

  • Michael McGuire

    • Oak Ridge Natl Lab

  • Arnab Banerjee

    • Oak Ridge Natl Lab

  • Ken Littrell

    • Oak Ridge Natl Lab

  • David Mandrus

    • Oak Ridge Natl Lab
    • Department of Materials Science and Engineering, the University of Tennessee, Knoxville, TN 37996, USA
    • Oak Ridge National Lab
    • Univ of Tennessee
    • University of Tennessee and Oak Ridge National Laboratory
    • Univ of Tennessee Knoxville
    • University of Tennessee, Oak Ridge National Laboratory

  • Stephen Nagler

    • Oak Ridge Natl Lab
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge TN 37830 USA
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory