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Article
Towards 31Mg-β-NMR resonance linewidths adequate for applications in magnesium chemistry
The span of most chemical shifts recorded in conventional 25Mg-NMR spectroscopy is ~ 100 ppm. Accordingly, linewidths of ~ 10 ppm or better are desirable to achieve adequate resolution for applications in chemist...
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Article
Development of a polarized 31Mg+ beam as a spin-1/2 probe for BNMR
A 28 keV beam of 31Mg+ ions was extracted from a uranium carbide, proton-beam-irradiated target coupled to a laser ion source. The ion beam was nuclear-spin polarized by collinear optical pum** on the ...
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Article
The phase diagram of electron-doped La2−xCexCuO4−δ
Superconductivity is a striking example of a quantum phenomenon in which electrons move coherently over macroscopic distances without scattering. The high-temperature superconducting oxides (cuprates) are the ...
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Article
Open AccessControlling the near-surface superfluid density in underdoped YBa2Cu3O6+x by photo-illumination
The interaction with light weakens the superconducting ground state in classical superconductors. The situation in cuprate superconductors is more complicated: illumination increases the charge carrier density...
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Chapter
Laser polarization facility
An overview of the laser polarizer facility at ISAC is provided. The chargeexchange cell is described in some detail.
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Article
Laser polarization facility
An overview of the laser polarizer facility at ISAC is provided. The charge-exchange cell is described in some detail.
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Article
Development of the collinear laser beam line at TRIUMF
The low-energy collinear laser beam line at ISAC routinely produces highly nuclear-spin polarized beams of 8Li + for depth-controlled studies of thin films and near-surface phenomena. It also is used for nuclear...
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Article
Spin dynamics of geometrically frustrated spin systems observed by muon spin relaxation
μSR is shown to be a sensitive probe of fluctuating internal magnetic fields in geometrically frustrated magnets. The usefulness of μSR in these systems is illustrated in the case of pyrochlores, in which the ...
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Article
Diffusion, trap**, and relaxation of Mu+ and Mu- in heavily‐doped GaAs
The diamagnetic muonium states in heavily doped GaAs are investigated with a combination of transverse‐field and longitudinal‐field μSR techniques. In metallic n‐type GaAs, formation of Mu- occurs because of the ...
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Article
Muon spin relaxation investigation of frustrated antiferromagnetic pyrochlores A2B2O7
In a system where magnetic ions occupy the vertices of edge or corner sharing triangular units, the natural antiferromagnetic coupling between ions is geometrically frustrated. A wide variety of interesting ma...
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Article
The giant muon Knight shift in antimony: Evidence for a Kondo impurity
A detailed study has been undertaken of the muon Knight shift in high purity antimony single crystals. No periodic variations with magnetic field (de Haas–van Alphen oscillations) are observed. The temperature...
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Article
Temperature dependence of the muon Knight shift in graphite measured using a μSR\times 2 method
We describe a simple method by which time differential μSR spectra are collected on two different samples simultaneously. One application is to make accurate measurements of the muon precession frequency in a ...
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Article
Probing magnetic order in heavily doped La2-xSrxNiO4+\delta with μSR
We report μSR measurements on a series of compounds with composition La2-xSrxNiO4+\delta where the net hole concentration x+2\delta is greater than 0.4. A magnetic transition is found in all the samples studied w...
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Article
Temperature and magnetic field dependences of the London penetration depth and coherence length in the vortex state of YBa2Cu3O7-\delta
We report TF‐μ+SR measurements of the London penetration depth in the high‐Tc superconductor YBa2Cu3O7-\delta as a function of temperature T and magnetic field H. The magnetic field distribution in high quality s...
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Article
μSR studies of the metallic alkali fullerides
We report ZF μSR measurements in Cs1C60 at low temperature and LF μSR in the superconductor Rb3C60. In Cs1C60, the internal magnetic field distribution is broad and static, and the relaxation at 1.9 K resembles t...
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Article
Interaction of anomalous muonium with electronic excitations in Si studied by longitudinal field μSR
We report longitudinal muon spin relaxation measurements in Si doped with phosphorus below room temperature. The data can be described qualitatively in a model where bond-centered muonium is undergoing spin ex...
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Article
Hebel-Slichter peak and superconducting energy gap in Rb3C60 observed by muon spin relaxation
Muon spin relaxation has been observed in both the normal and superconducting states of Rb3C60 (T c=29.3K). The field dependence of theT 1 spin relaxation rate is due to muonium undergoing spin-exchange scatterin...
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Article
Determination of λ and κ in a mosaic of single crystal YBa2Cu3O6.95
We present transverse fieldμSR measurements of the magnetic field distribution in a mosaic of single crystal YBa2Cu3O6.95 in high fields (1.9–6.5 T) applied parallel to the crystallographicc-axis. TheμSR lineshap...
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Article
Zero-field μSR in crystalline C60
The Co60Mu radical in polycrystalline C60 has been studied in zero magnetic field between 9 K and 200 K, and at room temperature. At low temperatures, we observe three low-frequency oscillations which correspond ...
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Article
μSR studies in heavily doped GaAs
Transverse-field (TF) and longitudinal-field (LF)μ + SR measurements have been made on conducting GaAs∶Si (n-type ≈ 1018 cm−3) and GaAs∶Zn (p-type ≈ 1019 cm−3) from 20 mK to 200 K. At low temperatures in GaAs∶Si,...
