Muon spin spectroscopy

Hillier, A. D.; Blundell, Stephen J.; McKenzie, Iain; Umegaki, Izumi; Shu, Lei; Wright, Joseph A.; Prokscha, T.; Bert, F.; Shimomura, Koichiro; Berlie, Adam; Alberto, H. V.; Watanabe, Isao

doi:10.1038/s43586-021-00089-0

Cited by 62 publications

(51 citation statements)

References 181 publications

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“…There is a clear plateau at low temperatures and, on heating, there is a drop in λ followed by a levelling off at higher temperatures. This is evidence that, at low temperatures, there are persistent electronic fluctuations, likely quantum in nature, with a constant fluctuation rate, as has been observed in 1D chain samples before [19,20,24,25]. As the temperature is increased, the electronic moments become more dynamic in nature, with a faster fluctuation rate, which corresponds to the drop in λ.…”

Section: (A)supporting

confidence: 68%

“…Once thermalized, the muon then responds to the local magnetic environment (both electronic and nuclear) and is able to separate out both static and dynamic parts of the susceptibility. Following the temperature evolution of magnetic states, one can probe the nature of the magnetism within a sample and discern whether the magnetic moments order or if the system is dominated by a dynamic state due to the presence of magnetic excitations [19,20].…”

mentioning

confidence: 99%

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Possible realization of the Majumdar-Ghosh point in the mineral szenicsite

Berlie

Terry

2022

Phys. Rev. B

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Section: (A)supporting

confidence: 68%

mentioning

confidence: 99%

Possible realization of the Majumdar-Ghosh point in the mineral szenicsite

Berlie

Terry

2022

Phys. Rev. B

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“…Detailed description about the µSR technique can be found in the Refs. 46,47 In case of a superconductor, the characteristic length scale namely penetration depth can be determined by probing the inhomogeneous field distribution of vortex lattice. Heliox cryostat with a He-3 insert was used to access temperature down to 250 mK.…”

Section: Methodsmentioning

confidence: 99%

Two types of charge order in the superconducting kagome material CsV$_3$Sb$_5$

Gupta¹,

Das²,

Mielke³

et al. 2022

Preprint

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The kagome metals of the family AV 3 Sb 5 , featuring a unique structural motif, harbor an array of intriguing phenomena such as chiral charge order and superconductivity. CsV 3 Sb 5 is of particular interest because it displays a double superconducting dome in the region of the temperature-pressure phase diagram where charge order is still present. However, the microscopic origin of such an unusual behavior remains an unsolved issue. Here, to address it, we combine high-pressure, low-temperature muon spin relaxation with first-principles calculations. We observe a pressure-induced threefold enhancement of the superfluid density, which also displays a double peak feature, similar to the superconducting critical temperature. This leads to three distinct regions in the phase diagram, each of which features distinct slopes of the linear relation between superfluid density and the critical temperature. These results are attributed to a possible evolution of the charge order pattern from the superimposed tri-hexagonal Star-of-David phase at low pressures (within the first dome) to the staggered tri-hexagonal phase at intermediate pressures (between the first and second domes). Our findings suggest a change in the nature of the charge ordered state across the phase diagram of CsV 3 Sb 5 , with varying degrees of competition with superconductivity.Among the series AV 3 Sb 5 (A = Rb, K, Cs), 1-3 the Cs compound manifests the highest superconducting critical temperature T c 2.5 K. CsV 3 Sb 5 also features multi-gap superconductivity and more importantly, a time reversal symmetry breaking (TRSB) chiral charge order below T co = 94 K, 4-7 as reported by scanning tunneling microscopy, 8 polar Kerr rotation, 5 and µSR experiments. 4,6 A comprehensive understanding of the interdependence between charge order (CO) and superconductivity (SC) is thus essential, and can be studied by using an appropriate external perturbation. In the quest to obtain an efficient tuning knob, hydrostatic pressure was found to be optimal. Indeed, pressure suppresses the charge order and results into an unusual but well-pronounced double superconducting dome in the temperature-pressure phase diagram.

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“…Presently, there are multiple applied research muon beam facilities in the world in operation: (i) Paul Scherrer Institute (PSI), Switzerland; (ii) ISIS, Rutherford Appleton Laboratory (RAL), United Kingdom; (iii) TRI Univeristy Meson Facility (TRIUMF), Canada; (iv) Japan Proton Accelerator Research Complex, MUon Science Establishment (J-PARC MUSE) and (v) MUon Science Innovative Channel (MuSIC), Japan. The interested reader is referred to comprehensive review of Hillier et al [46] about accomplishments, present research and future capabilities at the institutes listed above. The cyclotron-based high beam duty factor facilities at PSI, TRIUMF, and MuSIC provide continuous muon beams to the experimental areas.…”

Section: The Mixe Techniquementioning

confidence: 99%

Characterization of a Continuous Muon Source for the Non-Destructive and Depth-Selective Elemental Composition Analysis by Muon Induced X- and Gamma-rays

et al. 2022

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The toolbox for material characterization has never been richer than today. Great progress with all kinds of particles and interaction methods provide access to nearly all properties of an object under study. However, a tomographic analysis of the subsurface region remains still a challenge today. In this regard, the Muon Induced X-ray Emission (MIXE) technique has seen rebirth fueled by the availability of high intensity muon beams. We report here a study conducted at the Paul Scherrer Institute (PSI). It demonstrates that the absence of any beam time-structure leads to low pile-up events and a high signal-to-noise ratio (SNR) with less than one hour acquisition time per sample or data point. This performance creates the perspective to open this technique to a wider audience for the routine investigation of non-destructive and depth-sensitive elemental compositions, for example in rare and precious samples. Using a hetero-structured sample of known elements and thicknesses, we successfully detected the characteristic muonic X-rays, emitted during the capture of a negative muon by an atom, and the gamma-rays resulting from the nuclear capture of the muon, characterizing the capabilities of MIXE at PSI. This sample emphasizes the quality of a continuous beam, and the exceptional SNR at high rates. Such sensitivity will enable totally new statistically intense aspects in the field of MIXE, e.g., elemental 3D-tomography and chemical analysis. Therefore, we are currently advancing our proof-of-concept experiments with the goal of creating a full fledged permanently operated user station to make MIXE available to the wider scientific community as well as industry.

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Muon spin spectroscopy

Cited by 62 publications

References 181 publications

Possible realization of the Majumdar-Ghosh point in the mineral szenicsite

Possible realization of the Majumdar-Ghosh point in the mineral szenicsite

Two types of charge order in the superconducting kagome material CsV$_3$Sb$_5$

Characterization of a Continuous Muon Source for the Non-Destructive and Depth-Selective Elemental Composition Analysis by Muon Induced X- and Gamma-rays

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