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Muon diffusion in niobium in the presence of traps / Borghini, M ; Hartmann, O ; Karlsson, E ; Kehr, K W ; Niinikoski, T O ; Norlin, L O ; Pernestal, K ; Richter, D ; Soulié, J C ; Walker, E
Investigates muon diffusion in niobium with controlled amounts of interstitial impurities. The polarization decay was interpreted in terms of a two-state model where the muon is alternatively in a state of free diffusion or in traps. [...]
1978 - Published in : Phys. Rev. Lett. 40 (1978) 1723-6 APS Published version, local copy: PDF;
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2.
(91)
Muon diffusion in niobium in the presence of traps / Niinikoski, T O (CERN) ; Borghini, M (CERN) ; Hartmann, O (Inst. Phys., Uppsala) ; Karlsson, E (Inst. Phys., Uppsala) ; Kehr, K W (Jülich) ; Norlin, L O (Inst. Phys., Uppsala) ; Pernestål, K (Inst. Phys., Uppsala) ; Richter, D (Jülich) ; Soulié, L O (CERN) ; Walker, E (Geneva U.)
The first CERN experiments on Nb metal showed a behaviour of muon depolarisation rate Lambda (T) similar to that in Cu, but with indications of some structure in the 'flat' low-T region. Later measurements on more purified samples, containing less than 100 ppm substitutional impurities and varying concentrations of interstitial nitrogen, showed a very strong dependence of the depolarization rate on the nitrogen content. [...]
1979 - 11 p. - Published in : Hyperfine Interact. 6 (1979) 229-32 Fulltext: PDF;
In : 1st International Topical Meeting on Muon Spin Rotation, Rorschach, Switzerland, 4 - 7 Sep 1978, pp.229-32
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3.
(29)
Muon motion in pure and weakly doped aluminium / Niinikoski, T O ; Hartmann, O ; Karlsson, E ; Kehr, K W ; Norlin, L O ; Richter, D ; Welter, J M
The authors have studied the diffusion and localization of positive muons in pure and weakly doped aluminium, in the temperature range 30 mK-100K, by measuring the damping parameter of the muon spin rotation ( mu SR) signal. In this paper they discuss some of their recent results and draw the following conclusions: i) in pure Al, positive muons are delocalized in band states (coherent motion); ii) in Al doped with 5-70 ppm Mn, the temperature, concentration and field dependences of the damping parameter suggest diffusion or capture limited trapping to octahedral interstitial sites in the aluminium lattice below 1K; iii) above 2K a two-state diffusion-trapping model explains well the peak in the damping parameter, which appears at 15-50K for the dopants Mn, Mg, Li and Ag so far studied. [...]
1981 - Published in : Physica B 108+ (1981) 879-82
In : 16th International Conference on Low-temperature Physics pts.1-3, Los Angeles, CA, USA, 19 - 25 Aug 1981, pp.879-82
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4.
(29)
Muon diffusion and trapping in aluminum and dilute aluminum alloys : experiments and comparison with small-polaron theory / Kehr, K W ; Richter, D ; Welter, J M ; Hartmann, O ; Karlsson, E B ; Norlin, L O ; Niinikoski, T O ; Yaouanc, A L
CERN-EP-82-16.- Geneva : CERN, 1982 - 57 p. - Published in : Phys. Rev. B 26 (1982) 567-590 APS Published version, local copy: PDF; Fulltext: PDF;
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5.
(26)
Addendum to project SC65 : local magnetic fields in ferromagnetics studied by positive muon precession / Hartmann, O ; Karlsson, E ; Norlin, L O ; Pernestal, K
CERN-PSCC-78-4 ; PSCC-M-3. - 1978. - 5 p.
Fulltext
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6.
(23)
Proposal : Progress report of SC 65 / Karlsson, G ; Hartmann, O ; Norlin, L O ; Pernestal, K (et al.)
CERN-SCC-77-10. - 1977. - 5 p.
Fulltext
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7.
(17)
Proposal : impurity trapping of positive muons in metals / Hartmann, O ; Karlsson, E ; Kehr, K W ; Niinikoski, T O (et al.)
CERN-SCC-77-20. - 1977. - 4 p.
Fulltext
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8.
(11)
Positive muon diffusion in iron and nickel : pressure dependence / Butz, T ; Chappert, J ; Dufresne, J F ; Hartmann, O ; Karlsson, E ; Lindgren, B ; Longobardi, R ; Norlin, L O ; Pezzetti, J P ; Yaouanc, A
The hyperfine field B/sub hf/ at positive muon ( mu /sup +/) in iron and nickel was previously found. Exhibits marked deviations from the bulk magnetization as a function of temperature. [...]
1980 - Published in : J. Magn. Magn. Mater. 15-18 (1980) 671-2
In : International Conference on Magnetism, Munich, Germany, 3 - 7 Sep 1979, pp.671-2
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9.
(11)
Studies of mu+ localization in Cu, Al, and Al alloys in the temperature interval 0.03-100 K / Hartmann, O (Univ. Uppsala) ; Karlsson, E B (Univ. Uppsala) ; Norlin, L O (Univ. Uppsala) ; Niinikoski, T O (CERN) ; Kehr, K W (Inst. für Festkörperforschung der Kernforschungsanlage, Jülich) ; Richter, D (Inst. für Festkörperforschung der Kernforschungsanlage, Jülich) ; Welter, J M (Inst. für Festkörperforschung der Kernforschungsanlage, Jülich) ; Yaouanc, A L (Centre d'Etude Nucléaire, Grenoble) ; Le Hericy, J (Centre d'Etude de Chimie Métallurgique, Vitry)
CERN-EP-79-114.- Geneva : CERN, 1980 - Published in : Phys. Rev. Lett. 44 (1980) 337-340 APS Published version, local copy: PDF; Fulltext: PDF;
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10.
(11)
Some aspects of impurity trapping of muons / Karlsson, E
Several aspects of muon trapping in metals have been studied during the last two years, but the situation is still far from clear. The precise nature of the traps as well as the mechanisms leading to trapping seem to require more detailed investigations than those carried out so far. [...]
1981 - Published in : Hyperfine Interact. 8 (1981) 647-54
In : TRIUMF Muon Physics/Facility Workshop, Vancouver, Canada, 8 - 9 Aug 1980, pp.947-54
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