Implanted muon studies in condensed matter science

Cox, S. F. J.

doi:10.1088/0022-3719/20/22/005

Cited by 298 publications

(160 citation statements)

References 262 publications

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“…Such muons stop in the matter at the depth about 0.15 g/cm 2 , which for the sample density of 5 g/cm3 corresponds to the depth of 0.3 mm. The stopping depth could be reduced using a degrader in front of the sample, but depth spreadout (due to the range straggling typically 10% of the nominal range) still limits the use of µSR technique to bulk samples.…”

Section: Muon Implantationmentioning

confidence: 95%

“…The detailed discussion of the muonium states in semiconductors and more references may be found in Chap. 4 of the review of Cox [2], in the review article of Patterson [4] and in shorter but more recent articles [14,15]. -In magnetic oxides the muon bounds to the oxygen atom (see the review [16]) and below 150 K remain localized at about 1 A from it.…”

Section: Muon Site and Chemistry Of Muon Bindingmentioning

confidence: 99%

“…The review will be preceded by a short description of the μSR method. More details about the method can be found in reviews [1,2].…”

Section: Introductionmentioning

confidence: 99%

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Muon Spin Rotation in High T_cSuperconductors

Golnik

1993

Acta Phys. Pol. A

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Section: Muon Implantationmentioning

confidence: 95%

Section: Muon Site and Chemistry Of Muon Bindingmentioning

confidence: 99%

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Muon Spin Rotation in High T_cSuperconductors

Golnik

1993

Acta Phys. Pol. A

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“…In insulating materials, the implanted muon may bind an electron to form muonium, an exotic light hydrogen isotope with the positive muon as the nucleus (Cox 1987). This species may, in turn, react with organic systems to form radical states: in both cases the muon-electron hyperfine coupling complicates the signal measured and determining the fractions of the various muonic states present in the system is an important aspect of the experiment.…”

Section: Introductionmentioning

confidence: 99%

Local magnetism in palladium bionanomaterials probed by muon spectroscopy

et al. 2011

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Palladium bionanomaterial was manufactured using the sulfate-reducing bacterium, Desulfovibrio desulfuricansm, to reduce soluble Pd(II) ions to cell-bound Pd(0) in the presence of hydrogen. The biomaterial was examined using a Superconducting Quantum Interference Device (SQUID) to measure bulk magnetisation and by Muon Spin Rotation Spectroscopy ( SR) which is uniquely able to probe the local magnetic environment inside the sample. Results showed behaviour attributable to interaction of muons both with palladium electrons and the nuclei of hydrogen trapped in the particles during manufacture. Electronic magnetism, also suggested by SQUID, is not characteristic of bulk palladium and is consistent with the presence of nanoparticles previously seen in electron micrographs. We show 2 the first use of μSR as a tool to probe the internal magnetic environment of a biologically-derived nanocatalyst material.

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“…Introduction Several experimental studies have demonstrated that measurements of the depolarization of positive muons implanted in magnetic materials have the potential to provide useful information, at an atomic level of detail, on the fluctuations of the magnetic moments; see, for example, Cox (1987) and Dalmas de Reotier et al (1994).…”

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confidence: 99%

Muon spin relaxation in ferromagnets: theoretical results for paramagnetic EuO and EuS

Lovesey¹,

Engdahl²

1995

J. Phys.: Condens. Matter

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The relaxation rate for depolarization of a positive muon implanted in an isotropic magnetic salt with ferromagnetic exchange interactions is studied theoretically, on the basis of the coupled-mode theory of critical and paramagnetic spin fluctuations and a full numerical evaluation of the dipole field experienced by the muon. The main findings from studies of realistic models of EuO and EuS are (a) a significant dependence of the relaxation rate, A, on the assumed position of the implanted muon and (b) a monotonic temperature dependence, with A -~3 12 in the approach to the critical temperature at which the correlation length, ~, diverges. In contrast, previous results for a model of an isotropic magnet with an antiferromagnetic exchange, RbMnF 3 , show that A for this magnet is not a monotonic function of the temperature, and in the precursor region to Tc A increases with decreasing temperature with a power law behaviour A.-~1 12• The calculated values of A for EuO are consistent with data from preliminary experiments on the same salt.(1.) Introduction Several experimental studies have demonstrated that measurements of the depolarization of positive muons implanted in magnetic materials have the potential to provide useful information, at an atomic level of detail, on the fluctuations of the magnetic moments; see, for example, Cox (1987) and Dalmas de Reotier et al. (1994).In a previous paper we provided a comprehensive theoretical investigation of relaxation in the paramagnetic phase of an antiferromagnetically coupled material (Lovesey et al. 1994). The present paper reports findings from a similar, comprehensive investigation of muon relaxation in isotropic, ferromagnetically coupled systems. Results for two materials, EuO and EuS, are provided.The overall plan of the work is the same as that used to study the antiferromagnetically coupled salt, RbMnF 3 , namely, a complete numerical evaluation of the spatial Fourier transform of the dipole field between the muon moment and the atomic moments, and a description of critical and paramagnetic fluctuations of the atomic moments from a full version of the coupled-mode theory. In view of the strong similarities in the work for the two types of magnetic salts the background to the methods given here is very brief; the reader interested in these matters is referred to Lovesey et al. (1994).Turning to the results of our work based on realistic models of EuO and EuS -an isotropic Heisenberg magnet with exchange interactions out to the second shell of neighbouring spins -we find that the magnitude and temperature dependence of the relaxation rate, A, depend on the position assumed for the implanted muon. A similar finding was obtained in the study of RbMnF 3 • For the latter material, "A is not a monotonic function of the temperature. In contrast, the relaxation rates for EuO and EuS are found to be monotonic functions of the temperature, cf. Table (1). In the approach to the critical temperature ' A increases, and the temperature dependence, expressed in term...

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Implanted muon studies in condensed matter science

Cited by 298 publications

References 262 publications

Muon Spin Rotation in High T_cSuperconductors

Muon Spin Rotation in High T_cSuperconductors

Local magnetism in palladium bionanomaterials probed by muon spectroscopy

Muon spin relaxation in ferromagnets: theoretical results for paramagnetic EuO and EuS

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Implanted muon studies in condensed matter science

Cited by 298 publications

References 262 publications

Muon Spin Rotation in High TcSuperconductors

Muon Spin Rotation in High TcSuperconductors

Local magnetism in palladium bionanomaterials probed by muon spectroscopy

Muon spin relaxation in ferromagnets: theoretical results for paramagnetic EuO and EuS

Contact Info

Product

Resources

About

Muon Spin Rotation in High T_cSuperconductors

Muon Spin Rotation in High T_cSuperconductors