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