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Thermal neutron three-axis spectrometer with polarization analysis IN22

IN22 is a three-axis spectrometer (CRG) equipped for full polarization analysis. The option CRYOPAD and a 15 Tesla cryomagnet are optimised for inelastic scattering. The option ZETA provides neutron resonance spin echo (NRSE).

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Applications

  • Study of magnetic and structural excitation spectra on single crystals with neutrons of incident energies in the range 5-100 meV.
  • Longitudinal and spherical polarimetry of inelastic contributions
  • Measurements of inelastic nuclear-magnetic interference terms.
  • Polarized neutron inelastic scattering under high magnetic field (up to 12 T).
  • Measurements of magnetic ans structural excitation lifetimes.

Selected examples

High-Tc superconducting cuprate YBa2Cu3O6.85

One of the main interests of polarized neutrons and full polarization analysis is to allow a clear separation of magnetic contributions from the nuclear (structural) ones. An example of such a separation is shown in Fig.1 for the high-Tc superconducting cuprate YBa2Cu3O6.85.

The incident polarization is kept parallel to the scattering vector, in such a manner that the magnetic fluctuations contribute only to the spin-flip (SF) channel and the structural excitations to the non-spin-flip (NSF) channel.

These results demonstrate unambiguously the magnetic nature of the resonant peak at 41 meV and the existence of a spin gap around 25 meV.

S=1/2 spin ladder system Sr14Cu24O41

Another example is shown in Fig. 2 for the S=1/2 spin ladder system Sr14Cu24O41.

By measuring the SF contribution in the configuration for which the incident polarisation is maintained parallel to the scattering vector, it is possible to determine directly the magnetic response of copper ions as a function of the temperature.

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Pulsed magnetic fields up to 33 Tesla

By using a portable miniature pulsed magnet, we have succeeded in performing neutron diffraction in very strong magnetic fields up to 33 Tesla.
We have applied the technique to determine the magnetic structure of the frustrated antiferromagnet TbB4.