[Neutron] Webinar on Triple-Axis Spectroscopy for Quantum Materials Research by Martin Boehm on Friday

[Karin Griewatsch]

Dear friends of neutron research,

you are cordially invited to the the KFN neutron webinar lecture by


    Dr. Martin Boehm (ILL) on


    "Flux and Flexibility: Triple-Axis Spectroscopy for Quantum
    Materials Research"


    Friday, 27 March 2026, 11:00 - 12:00 CET

Zoom link: 
https://fz-juelich-de.zoom-x.de/j/68605264978?pwd=Z1ROzU0nTd9eaZhNjzHeverxQYuSaK.1
Meeting ID: 686 0526 4978
Passcode: 620383

Since its invention by Bertram Brockhouse in the 1950s, the triple-axis 
spectrometer (TAS) has been one of the central instruments of inelastic 
neutron scattering, enabling the first direct measurements of phonon and 
magnon dispersion relations and became a key tool in establishing the 
experimental basis of quantum condensed-matter physics [1,2]. In 
parallel with the development of wide-range mapping capabilities of 
modern time-of-flight (TOF) spectrometers, TAS have evolved to deliver 
precision and flexibility in focused regions of the momentum-energy 
phase space. In this talk, we provide a short overview of its 
present-day capabilities and its complementarity with modern (direct and 
indirect) TOF instruments.

One of the scientific strengths of TAS today lies particularly in 
parametric studies under extreme conditions such as high pressure and 
strong magnetic fields at millikelvin temperatures, where 
reciprocal-space access may be limited but fine control and background 
suppression are essential. We try to highlight representative examples 
from quantum magnetism and correlated quantum materials. In this 
context, TAS offers also distinctive capabilities through polarization 
analysis, providing direct access to the neutron spin state and enabling 
detailed insight into magnetic structures and spin dynamics.

Looking ahead, we discuss current instrumentation trends that extend TAS 
concepts toward multiplexed analyzer–detector systems, such as CAMEA at 
the Paul Scherrer Institute [3] and the future MARMOT at the Institut 
Laue–Langevin. These developments promise significant gains in 
efficiency while preserving the intrinsic strengths of TAS. Finally, we 
outline how modern data-analysis algorithms and semi-autonomous 
measurement strategies might further enhance performance, enabling 
efficient experiment planning [4,5]. Together, these advances position 
triple-axis spectroscopy as a continually evolving tool that remains 
indispensable within the broader neutron spectroscopy landscape.

[1] B.N. Brockhouse – Nobel Lecture. NobelPrize.org. Nobel Prize 
Outreach 2026. 
https://www.nobelprize.org/prizes/physics/1994/brockhouse/lecture/ 
<https://www.nobelprize.org/prizes/physics/1994/brockhouse/lecture/>
[2] see e.g. G. Shirane, S.M. Shapiro, J. Tranquade, /Neutron Scattering 
with a Triple-Axis Spectrometer/, Cambridge University Pressm 2009, ISBN 
9780511534881. https://doi.org/10.1017/CBO9780511534881 
<https://doi.org/10.1017/CBO9780511534881>
[3] J. Lass et al.,/Rev. Sci. //Instrum./ *1*February 2023; 94 (2): 
023302. https://doi.org/10.1063/5.0128226 
<https://doi.org/10.1063/5.0128226>
[4] M.M. Noack et al., Nature Reviews Physics *3*, 685-697 (2021).
[5] M. Teixeira Parente et al., Nat Commun *14*, 2246 (2023).


The lecture will be recorded, and there is information on data protection at
https://www.sni-portal.de/en/files/kfn-neutron-webinar-data-protection 
<https://www.sni-portal.de/en/files/kfn-neutron-webinar-data-protection>

On the website
https://www.sni-portal.de/en/user-committees/committee-research-with-neutrons/neutron-webinar 
<https://www.sni-portal.de/en/user-committees/committee-research-with-neutrons/neutron-webinar>you 
will find announcements of upcoming lectures.

We look forward to "seeing" you there!

Kind regards,

Karin Griewatsch (KFN PR)
Mirijam Zobel (KFN chair)
Frank Schreiber and Thomas Gutberlet (Webinar organization)
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