Abstract
We report proof-of-principle measurements at the neutron resonance spin echo spectrometer RESEDA (MLZ) under large magnetic fields by means of Modulation of IntEnsity with Zero Effort (MIEZE). Our study demonstrates the feasibility of applying strong magnetic fields up to 17\,T at the sample while maintaining unchanged sub-$\mu$eV resolution. We find that the MIEZE-spin-echo resolution curve remains essentially unchanged as a function of magnetic field up to the highest fields available, promising access to high fields without need for additional fine-tuning of the instrument. This sets the stage for the experimental investigation of subtle field dependent phenomena, such as magnetic field-driven phase transitions in hard and soft condensed matter physics.
Highlights
A wide range of prominent scientific problems involving high magnetic fields, such as the spectrum of thermal fluctuations stabilising the Skyrmion lattice phase in chiral magnets [1, 2], quantum phase transitions of transverse field Ising magnets [3] or field-induced BoseEinstein condensation of magnons [4], require neutron spectroscopy at sub-μeV resolution. Despite this importance only very few studies of this kind have been reported in the literature. This situation may be traced to the limitations of conventional neutron scattering techniques such as triple axis spectroscopy (TAS) or time of flight spectroscopy (ToF), for which the resolution is directly tied to satisfying strict optical conditions causing a drastic loss of neutron intensity
In a first series of tests the 5 T small angle neutron scattering (SANS) magnet was used with the t-Modulation of IntEnsity with Zero Effort (MIEZE) option at a distance of L S = 1.38 m to the detector and a distance between the last transverse NRSE (TNRSE) coil and detector of L2 = 3.08 m
In conclusion we have demonstrated that large magnetic fields up to 17 T may readily be combined with the MIEZE technique as implemented at RESEDA at MLZ
Summary
A wide range of prominent scientific problems involving high magnetic fields, such as the spectrum of thermal fluctuations stabilising the Skyrmion lattice phase in chiral magnets [1, 2], quantum phase transitions of transverse field Ising magnets [3] or field-induced BoseEinstein condensation of magnons [4], require neutron spectroscopy at sub-μeV resolution Despite this importance only very few studies of this kind have been reported in the literature. It has long been established that the necessary high energy resolution may be achieved, in principle, by Neutron Spin Echo (NSE) [5], which, requires non-depolarizing samples or sample environments. In this paper we report proofof-principle measurements demonstrating the feasibility of using MIEZE as implemented at the NRSE spectrometer RESEDA (MLZ) for studies under high magnetic fields up to 17 T at the sample position
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