The new versatile general purpose surface-muon instrument (GPS) based on silicon photomultipliers for <i>μ</i>SR measurements on a continuous-wave beam

Amato, A.; Luetkens, H.; Sedlák, Kamil; Stoykov, A.; Scheuermann, R.; Elender, Matthias; Raselli, A.; Gräf, D.

doi:10.1063/1.4986045

Cited by 86 publications

(80 citation statements)

References 28 publications

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“…The magnetic susceptibility, electrical resistivity, and specific heat measurements were performed on a 7-T Quantum Design Magnetic Property Measurement System (MPMS-7) and a 9-T Physical Property Measurement System (PPMS-9). The muon-spin rotation/relaxation (µSR) experiments were carried out at the general purpose surface-muon (GPS) spectrometer at the Swiss muon source (SµS) at Paul Scherrer Institut, Villigen, Switzerland 9 . Both transverse-field (TF-) and zero-field (ZF-) µSR measurements were performed.…”

Section: Methodsmentioning

confidence: 99%

Crossover from multiple- to single-gap superconductivity in Nb5Ir3−xPtxO alloys

Jöhr

Das

et al. 2020

Phys. Rev. B

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By using mostly the muon-spin rotation/relaxation (µSR) technique, we investigate the superconductivity (SC) of Nb 5 Ir 3−x Pt x O (x = 0 and 1.6) alloys, with T c = 10.5 K and 9.1 K, respectively. At a macroscopic level, their superconductivity was studied by electrical resistivity, magnetization, and specific-heat measurements. In both compounds, the electronic specific heat and the low-temperature superfluid density data suggest a nodeless SC. The superconducting gap value and the specific heat discontinuity at T c are larger than that expected from the Bardeen-Cooper-Schrieffer theory in the weak-coupling regime, indicating strongcoupling superconductivity in the Nb 5 Ir 3−x Pt x O family. In Nb 5 Ir 3 O, multigap SC is evidenced by the field dependence of the electronic specific heat coefficient and the superconducting Gaussian relaxation rate, as well as by the temperature dependence of the upper critical field. Pt substitution suppresses one of the gaps, and Nb 5 Ir 1.4 Pt 1.6 O becomes a single-gap superconductor. By combining our extensive experimental results, we provide evidence for a multiple-to single-gap SC crossover in the Nb 5 Ir 3−x Pt x O family.

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Section: Methodsmentioning

confidence: 99%

Crossover from multiple- to single-gap superconductivity in Nb5Ir3−xPtxO alloys

Jöhr

Das

et al. 2020

Phys. Rev. B

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“…The magnetic susceptibility, electrical resistivity, and specific-heat measurements were performed on a 7-T Quantum Design Magnetic Property Measurement System (MPMS-7) and on a 14-T Physical Property Measurement System (PPMS-14) equipped with a 3 He option. The μSR measurements were carried out at the GPS spectrometer of the Swiss muon source at Paul Scherrer Institut, Villigen, Switzerland [10]. The μSR data were analyzed by means of the musrfit software package [11].…”

Section: Methodsmentioning

confidence: 99%

Enhanced T_c and multiband superconductivity in the fully-gapped ReBe₂₂ superconductor

et al. 2019

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In search of the origin of superconductivity (SC) in diluted rhenium superconductors and their significantly enhanced T c compared to pure Be (0.026 K), we investigated the intermetallic ReBe 22 compound, mostly by means of muon-spin rotation/relaxation (μSR). At a macroscopic level, its bulk SC (with T c =9.4 K) was studied via electrical resistivity, magnetization, and heat-capacity measurements. The superfluid density, as determined from transverse-field μSR and electronic specific-heat measurements, suggest that ReBe 22 is a fully-gapped superconductor with some multigap features. The larger gap value, D = 1.78 l 0 T k B c , with a weight of almost 90%, is slightly higher than that expected from the BCS theory in the weak-coupling case. The multigap feature, rather unusual for an almost elemental superconductor, is further supported by the field-dependent specific-heat coefficient, the temperature dependence of the upper critical field, as well as by electronic bandstructure calculations. The absence of spontaneous magnetic fields below T c , as determined from zero-field μSR measurements, indicates a preserved time-reversal symmetry in the superconducting state of ReBe 22 . In general, we find that a dramatic increase in the density of states at the Fermi level and an increase in the electron-phonon coupling strength, both contribute to the highly enhanced T c value of ReBe 22 .

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“…Muon-spin relaxation (µSR) measurements were performed using the continuous muon beam at the Paul Scherrer Institute, Villigen, Switzerland. Compounds with different Li substitution values were studied using the low-background instrument GPS, 18 with the powders placed in a fly-by forktype sample holder. The high-pressure µSR measurements were performed at the GPD instrument, 19 where the samples were placed into a double-wall pressure cell, similar to those described in Refs.…”

Section: Methodsmentioning

confidence: 99%

Chemical and hydrostatic-pressure effects on the Kitaev honeycomb material Na2IrO3

et al. 2018

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The low-temperature magnetic properties of polycrystalline Na 2 IrO 3 , a candidate material for the realization of a quantum spin-liquid state, were investigated by means of muon-spin relaxation and nuclear magnetic resonance methods under chemical and hydrostatic pressure. The Li-for-Na chemical substitution promotes an inhomogeneous magnetic order, whereas hydrostatic pressure (up to 3.9 GPa) results in an enhancement of the ordering temperature T N . In the first case, the inhomogeneous magnetic order suggests either short-or long-range correlations of broadly distributed j = ½ Ir 4+ magnetic moments, reflecting local disorder. The increase of T N under applied pressure points at an increased strength of three dimensional interactions arising from interlayer compression.

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

Cited by 86 publications

References 28 publications

Crossover from multiple- to single-gap superconductivity in Nb5Ir3−xPtxO alloys

Crossover from multiple- to single-gap superconductivity in Nb5Ir3−xPtxO alloys

Enhanced T_c and multiband superconductivity in the fully-gapped ReBe₂₂ superconductor

Chemical and hydrostatic-pressure effects on the Kitaev honeycomb material Na2IrO3

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

Cited by 86 publications

References 28 publications

Crossover from multiple- to single-gap superconductivity in Nb5Ir3−xPtxO alloys

Crossover from multiple- to single-gap superconductivity in Nb5Ir3−xPtxO alloys

Enhanced Tc and multiband superconductivity in the fully-gapped ReBe22 superconductor

Chemical and hydrostatic-pressure effects on the Kitaev honeycomb material Na2IrO3

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Product

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Enhanced T_c and multiband superconductivity in the fully-gapped ReBe₂₂ superconductor