High-Field μSR Instrument at PSI: Detector Solutions

Stoykov, A.; Scheuermann, R.; Sedlák, Kamil; Rodriguez, John; Greuter, U.; Amato, A.

doi:10.1016/j.phpro.2012.04.028

Cited by 14 publications

(12 citation statements)

References 8 publications

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“…The first relates to the upgrade of the GPD spectrometer itself. A new detector system consisting of plastic scintillators read-out by Geiger-mode Avalanche Photodiodes (APD) [70][71][72][73][74][75] is planned to be installed in the next few years. The use of APD's, which are not sensitive to magnetic fields and do not require the usage of long light guides, allows to build a very compact detector system with an optimized detectors geometry thus improving the signal to background ratio.…”

Section: Discussionmentioning

confidence: 99%

High pressure research using muons at the Paul Scherrer Institute

Khasanov

Guguchia

Maisuradze

et al. 2016

High Pressure Research

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Pressure, together with temperature and magnetic field, is an important thermodynamical parameter in physics. Investigating the response of a compound or of a material to pressure allows to elucidate ground states, investigate their interplay and interactions and determine microscopic parameters. Pressure tuning is used to establish phase diagrams, study phase transitions and identify critical points. Muon spin rotation/relaxation (muSR) is now a standard technique making increasing significant contribution in condensed matter physics, material science research and other fields. In this review, we will discuss specific requirements and challenges to perform muSR experiments under pressure, introduce the high-pressure muon facility at the Paul Scherrer Institute (PSI, Switzerland) and present selected results obtained by combining the sensitivity of the muSR technique with pressure.Comment: Submitted to High Pressure Research. 26 pages, 17 Figure

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Section: Discussionmentioning

confidence: 99%

High pressure research using muons at the Paul Scherrer Institute

Khasanov

Guguchia

Maisuradze

et al. 2016

High Pressure Research

Self Cite

101

146

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“…The technique has also been shown to usefully probe the phase diagram and excitations in systems based on coupled antiferromagnetic dimers [5] and in spin liquid systems [16], whose low energy physics can also be viewed as being related to that of antiferromagnetically coupled, strongly interacting dimers. However, detailed investigations of spin ladders using μ + SR have not been possible until the recent commissioning of new spectrometers with high magnetic field and low temperature capabilities [17,18]. There is also a direct and useful correspondence between a spin Hamiltonian in an applied magnetic field and a lattice boson Hamiltonian in the grand canonical ensemble [8], where the applied magnetic field acts as an effective chemical potential for the boson excitations.…”

Section: Introductionmentioning

confidence: 99%

Quantum magnetism in molecular spin ladders probed with muon-spin spectroscopy

et al. 2018

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We present the results of muon-spin spectroscopy (μ + SR) measurements on the molecular spin ladder system (Hpip) 2 CuBr 4(1−x) Cl 4x , [Hpip=(C 5 H 12 N)]. Using transverse field μ + SR we are able to identify characteristic behaviour in each of the regions of the phase diagram of the x=0 strong-rung spin ladder system (Hpip) 2 CuBr 4 . Comparison of our results to those of the dimer-based molecular magnet Cu(pyz)(gly)(ClO 4 ) shows several common features. We locate the crossovers in partially disordered (Hpip) 2 CuBr 4(1−x) Cl 4x (x=0.05), where a region of behaviour intermediate between quantum disordered and Luttinger liquid-like is identified. Our interpretation of the results incorporates an analysis of the probable muon stopping states in (Hpip) 2 CuBr 4 based on density functional calculations and suggests how the muon plus its local distortion can lead to a local probe unit with good sensitivity to the magnetic state. Using longitudinal field μ + SR we compare the dynamic response of the x=1 strong-rung material (Hpip) 2 CuCl 4 to that of the strong-leg material (C 7 H 10 N) 2 CuBr 4 (known as DIMPY) and demonstrate that our results are in agreement with predictions based on interacting fermionic quasiparticle excitations in these materials.

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“…SiPM based µSR detectors have been first developed to equip the avoided level-crossing instrument (ALC) at PSI 15,16 . This was the first step and a proof of principle for the consequent development of SiPM-based detectors for the new high magnetic field instrument HAL-9500 at PSI [17][18][19] . These solid-state photodetectors have been shown to deliver performances similar to that of photomultiplier tubes (PMT) but present several advantages as their compactness and the fact that their performance is insensitive to magnetic fields.…”

Section: Muon and Positron Detectors A Detector Geometrymentioning

confidence: 97%

The new versatile general purpose surface-muon instrument (GPS) based on silicon photomultipliers for μSR measurements on a continuous-wave beam

Amato

Luetkens

Sedlák

et al. 2017

Review of Scientific Instruments

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We report on the design and commissioning of a new spectrometer for muon-spin relaxation/rotation studies installed at the Swiss Muon Source (SµS) of the Paul Scherrer Institute (PSI, Switzerland). This new instrument is essentially a new design and replaces the old general-purpose surface-muon instrument (GPS) which has been for long the workhorse of the µSR user facility at PSI. By making use of muon and positron detectors made of plastic scintillators read out by silicon photomultipliers (SiPMs), a time resolution of the complete instrument of about 160 ps (standard deviation) could be achieved. In addition, the absence of light guides, which are needed in traditionally built µSR instrument to deliver the scintillation light to photomultiplier tubes located outside magnetic fields applied, allowed us to design a compact instrument with a detector set covering an increased solid angle compared to the old GPS.

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High-Field μSR Instrument at PSI: Detector Solutions

Cited by 14 publications

References 8 publications

High pressure research using muons at the Paul Scherrer Institute

High pressure research using muons at the Paul Scherrer Institute

Quantum magnetism in molecular spin ladders probed with muon-spin spectroscopy

The new versatile general purpose surface-muon instrument (GPS) based on silicon photomultipliers for μSR measurements on a continuous-wave beam

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