VErsatile Intense Triple-Axis Spectrometer
VERITAS | HB-1A | HFIR
VERITAS is primarily used for performing parametric studies of magnetic order, exploring critical behavior, determining magnetic structures, and mapping out phase diagrams in single crystals and antiferromagnetic thin films. Unlike conventional diffractometers, the use of a double-bounce monochromator system and an analyzer with energy discrimination supress the background and provide an excellent signal-to-noise ratio for VERITAS. This instrument also features a high flux, clean beam free of higher-order wavelength contamination, and wide array of available sample environments. It is optimized for investigating the magnetic properties of quantum materials and it is a particularly good instrument for studying weak scattering signals in small single crystals and antiferromagnetic thin films. Recently, a four-circle goniometer option was added to the instrument program and it can be used for both parametric studies and magnetic structure determination of single crystals.
The following examples highlight the capabilities of VERITAS:
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Investigating magnetic order in topological materials
• "Large Topological Hall Effect and Spiral Magnetic Order in the Weyl Semimetal SmAlSi", Physical Review X 13, 011035 (2023).
• "Thermal cycling induced alteration of the stacking order and spin-flip in the room temperature van der Waals magnet Fe5GeTe2", Physical Review Materials 7, 044411 (2023).
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Parametric studies of antiferromagnetic thin films
• "Direct neutron-diffraction-based measurement of magnetic order in brownmillerite SrCoO2.5 and La0.5 Sr0.5CoO2.5 thin films", APL Materials 12, 4, 041123 (2024).
• "Electronic and magnetic properties of hole-doped topological kagome Fe1-xMnxSn thin films", Physical Review Materials 9, 074201 (2025).
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Probing complex magnetic order and spin textures in quantum materials
• New insight into tuning magnetic phases of RMn, npj Quantum Materials 9, 42 (2024).
• "EuAuSb: An odd-parity helical variation of altermagnetism", Physical Review B 112, 094455 (2025).
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Combined elastic and inelastic study on a high-temperature superconductor
• "Tilted stripes origin in La1.88Sr0.12CuO4 revealed by anisotropic next-nearest neighbor hopping", Communications Physics, 7, 257 (2024).
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