New frontiers in muon-spin spectroscopy using Si-pixel detectors

The study of novel quantum materials relies on muon-spin rotation, relaxation, or resonance (μSR) measurements. Yet, a fundamental limitation persists: many of these materials can only be synthesized in extremely small quantities, often at sub-millimeter scales. While μSR offers unique insights into...

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Hauptverfasser: Augustin, Heiko (VerfasserIn) , Berger, Niklaus (VerfasserIn) , Doll, Andrin (VerfasserIn) , Isenring, Pascal (VerfasserIn) , Köppel, Marius (VerfasserIn) , Krieger, Jonas A. (VerfasserIn) , Luetkens, Hubertus (VerfasserIn) , Mandok, Lukas (VerfasserIn) , Prokscha, Thomas (VerfasserIn) , Rudzki, Thomas (VerfasserIn) , Schöning, André (VerfasserIn) , Salman, Zaher (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: November 2025
In: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
Year: 2025, Jahrgang: 1080, Pages: 1-4
ISSN:1872-9576
DOI:10.1016/j.nima.2025.170681
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.nima.2025.170681
Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0168900225004826
Volltext
Verfasserangaben:Heiko Augustin, Niklaus Berger, Andrin Doll, Pascal Isenring, Marius Köppel, Jonas A. Krieger, Hubertus Luetkens, Lukas Mandok, Thomas Prokscha, Thomas Rudzki, André Schöning, Zaher Salman

MARC

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520 |a The study of novel quantum materials relies on muon-spin rotation, relaxation, or resonance (μSR) measurements. Yet, a fundamental limitation persists: many of these materials can only be synthesized in extremely small quantities, often at sub-millimeter scales. While μSR offers unique insights into electronic and magnetic properties, existing spectrometers lack a sub-millimeter spatial resolution and the possibility of triggerless pump-probe data acquisition, which would enable more advanced measurements. The General Purpose Surface-muon instrument (GPS) at the Paul Scherrer Institute (PSI) is currently limited to a muon stopping rate of 40kHz to 120kHz, a constraint that will become more pressing with the upcoming High-Intensity Muon Beam (HIMB) project. To overcome these challenges, we demonstrate the feasibility of employing ultra-thin monolithic Si-pixel detectors to reconstruct the stopping position of muons within the sample, thereby significantly enhancing the capability of measuring at higher muon rate. Additionally, we explore the first steps towards a triggerless pump-probe μSR measurement scheme. Unlike conventional pump-probe techniques that require external triggers, a triggerless readout system can continuously integrate stimuli pulses into the data stream, allowing real-time tracking of ultra-fast dynamics in quantum materials. This approach will enable the study of transient states, spin dynamics, and quantum coherence under external stimuli. 
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