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Related Experiment Videos

High resolution neutron Larmor diffraction using superconducting magnetic Wollaston prisms.

Fankang Li1,2, Hao Feng3, Alexander N Thaler4

  • 1Instrument and Source Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA. fankangli@hotmail.com.

Scientific Reports
|April 15, 2017
PubMed
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Superconducting magnetic Wollaston prisms enable neutron Larmor diffraction, successfully measuring thermal expansion. This technique offers high resolution for inelastic phonon studies, comparable to Neutron Resonance Spin Echo (NRSE) coils.

Area of Science:

  • Condensed Matter Physics
  • Neutron Scattering Techniques

Background:

  • Neutron Larmor diffraction is a powerful tool for studying magnetic structures and dynamics.
  • Existing methods for neutron polarization and manipulation can be complex and may limit resolution.

Purpose of the Study:

  • To implement and validate the neutron Larmor diffraction technique using superconducting magnetic Wollaston prisms.
  • To investigate the performance of single-arm and double-arm configurations.
  • To demonstrate the potential for inelastic phonon line-width measurements.

Main Methods:

  • Utilized superconducting magnetic Wollaston prisms in both single-arm and double-arm configurations for neutron Larmor diffraction.
  • Employed a novel tuning method by varying magnetic field configurations.

Related Experiment Videos

  • Measured the coefficient of thermal expansion of a single-crystal copper sample.

    • Main Results:

    • Successfully demonstrated the neutron Larmor diffraction technique with superconducting magnetic Wollaston prisms.
    • Tuning results using magnetic field variations showed good agreement with previous measurements.
    • Experimentally investigated and compared single-arm and double-arm configurations.

    Conclusions:

    • The implemented method benchmarks the application of magnetic Wollaston prisms in Larmor diffraction.
    • The setup shows potential for inelastic phonon line-width measurements.
    • Achievable resolution is comparable to Neutron Resonance Spin Echo (NRSE) coils, with high neutron polarization and transmission efficiency.