Radio-frequency spin resonance of positive muons in α-iron at high temperatures

Hampele, M.; Herlach, D.; Kratzer, A.; Majer, G.; Major, J.; Raich, Hans-Peter; Roth, Roland; Scott, Christopher A.; Seeger, A.; Templ, Wolfgang; Blanz, Martin; Cox, S.F.J.; Fürderer, K.

doi:10.1007/bf02397764

Cited by 10 publications

(4 citation statements)

References 13 publications

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“…It has the advantage that it is insensitive against unwanted ªbackgroundº relaxation processes and that it can be employed also somewhat above T C . The experimental results confirm the conclusions drawn from a); for details the reader is referred to the literature [46,47]. c) m spin rotation in an external magnetic field transverse to the m spin polarization.…”

Section: High-temperature M Srsupporting

confidence: 87%

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Lattice Vacancies in High-Purity α-Iron

Seeger

1998

phys. stat. sol. (a)

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The paper is both a review of the properties of vacancies in high‐purity α‐iron and an original contribution. In the review part it is shown that self‐diffusion in α‐iron occurs by the vacancy mechanism, that the sum of the monovacancy formation and migration enthalphies in the magnetically fully ordered state is HF1V + HM1V = (2.91 ± 0.04) eV, and that for the monovacancy formation enthalpy 1.61 eV ≤ HF1V ≤ 1.75 eV holds. The result for the monovacancy migration energy, HM1V = (1.23 ± 0.11) eV, excludes with certainty the attribution of Stage‐III recovery to vacancy migration and supports the view that the Stage‐III defect is a self‐interstitial. It is shown that at elevated temperatures positrons trapped in vacancies in body‐centred cubic iron may escape from them. The binding energy of positrons to the vacancies is estimated to be about 1.1 eV. This estimate is in agreement with the analysis of the high‐temperature trapping of positive muon by vacancies, which in the present case proved to be the most sensitive technique for detecting vacancies present in thermal equilibrium.

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Section: High-temperature M Srsupporting

confidence: 87%

“…However, according to what has just been said, this is unlikely to be a major effect in the present case. b) m spin resonance in a magnetic field applied longitudinally to the m spin polarization [46,47]. Like electrons and positrons, muons are spin-1/2 particles.…”

Section: High-temperature M Srmentioning

confidence: 99%

Lattice Vacancies in High-Purity α-Iron

Seeger

1998

phys. stat. sol. (a)

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“…P~~.~ under rf irradiation at the frequencies corresponding to a single quantum transition is calculated using Eqs. (11) and (3). At resonance and if 0)… q > lE2 --/~1 [/2 it takes the form…”

Section: Time-differential Rf#srmentioning

confidence: 99%

“…This species-selective longitudinal-field method has been already used in 1958 to determine the g-factor of the muon [3] but was not systematically applied until 1982 [4]. In the last few years it has been successfully used, for example, in the investigation of muonium reactions in alkali halides [5,6] or organic liquids [7][8][9], muon trapping at monovacancies in ct-iron [10,11], or in the investigation of dynamics of the various muon species in semiconductors [12][13][14][15][16]. The potential of the RFliSR method is demonstrated, for example, by the fact that in doped silicona considerable fraction of the implanted muons contribute to the diamagnetic signal, i.e., are found to end up asa diamagnetic species q161 By contrast, on the same samples, only a very small fraction of q161 is observable by TFliSR whereas the unobservable (missing) fraction is large in those experiments.…”

Section: Introductionmentioning

confidence: 99%

Radio-frequency muon spin resonance (RFμSR) experiments on condensed matter

Scheuermann

Schimmele²,

Schmidl

et al. 1997

Appl. Magn. Reson.

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Abstraet. In this paper we presentan overview of the radio-frequency muon spin resonance (RF~tSR) teehnique, ah analogue to continuous-wave NMR, and an introduction to time-integral (TI) and timedifferential (TD) RF~SR on muons in diamagnetic or in paramagnetic environments. The general form of the resonance line for TI-RFp.SR as well as the expression for the time-dependence of the longitudinal muon spin polarization at resonance ate given. Since RFIzSR does not require phase coherente of the muon spin ensemble, this teclmique allows us to investigate muon species that ate generated by transitions from, or in the course of reactions of, a precursor muon species even ir in transverse-field (TF) ~tSR measurements the signal is lost due to dephasing. This ability of RF~tSR is clearly demonstrated by measurements on doped Si. In this example, at low temperatures, a very pronounced signal from a muon species in diamagnetic environment has been found in RF~tSR measurements, whereas in TF~tSR experiments only a very small signal from muons in diamagnetic environment could be detected anda large fraction of the implanted muons escaped detection. These findings could be interpreted in terms of the delayed formation of a diamagnetic muonium-dopant complex, and, due to the large diamagnetic RFp.SR signal, the RFp.SR teclmique is a unique tool to study how the variation of parameters and experimental eonditions suela as illumination affects formation and behavior of these complexes. First results obtained on illuminated boron doped Si are reported. However, as illustrated by the example of experiments on the muonated radical in solid C60, results from conventional TI-RFbtSR eannot always be interpreted unambiguously sinee different parameters, namely the fraction of muons forming the investigated muon species, the longitudinal and the transverse relaxation rates, have similar effects on height and shape of the RFp.SR resonance line. These ambiguities, however, may be resolved by collecting time-differential data. With this extension RF~tSR becomes a very powerful complementary method to TF~tSR in the studies of dynamic effects.

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Atomic Defects in High-Purity Metals: Fundamentals and Equilibrium Concentrations

Seeger¹

2002

Purification Process and Characterization of Ultra High Purity Metals

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Radio-frequency spin resonance of positive muons in α-iron at high temperatures

Cited by 10 publications

References 13 publications

Lattice Vacancies in High-Purity α-Iron

Lattice Vacancies in High-Purity α-Iron

Radio-frequency muon spin resonance (RFμSR) experiments on condensed matter

Atomic Defects in High-Purity Metals: Fundamentals and Equilibrium Concentrations

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