Muon Korringa relaxation
Significant muon spin-lattice relaxation is found in a number of non-magnetic semimetals and metals. Measured in longitudinal magnetic field, the relaxation rate is independent of field up to several kilogauss and generally increases monotonically with temperature. This suggests a form of Korringa r...
| Main Authors: | , , , , , , |
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| Format: | Conference item |
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2000
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| _version_ | 1826307201205010432 |
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| author | Cox, S Cottrell, S Charlton, M Donnelly, P Blundell, S Smith, J Cooley, J |
| author_facet | Cox, S Cottrell, S Charlton, M Donnelly, P Blundell, S Smith, J Cooley, J |
| author_sort | Cox, S |
| collection | OXFORD |
| description | Significant muon spin-lattice relaxation is found in a number of non-magnetic semimetals and metals. Measured in longitudinal magnetic field, the relaxation rate is independent of field up to several kilogauss and generally increases monotonically with temperature. This suggests a form of Korringa relaxation, originating in the hyperfine interaction between the implanted muons and the conduction electrons. Bearing in mind that NMR data on Korringa relaxation refers chiefly to the host nuclei, the muon offers a probe of conduction-electron encounter at an interstitial site, linking the topic to the nature of defect screening in metals, to relaxation by spin-density fluctuations in magnetic materials and to spin- and charge-exchange on paramagnetic muonium centres in semiconductors. Data are presented for C (graphite), Bi, Pb and Cd and compared with the Korringa predictions using known values of the muon Knight shift. Control experiments are described on Zn and Cu, both pure and deliberately doped with magnetic impurity. For graphite, an interpretation is given in terms of charge-exchange on a molecular radical formed by the chemical reaction of interstitial muonium. (C) 2000 Elsevier Science B.V. All rights reserved. |
| first_indexed | 2024-03-07T06:59:22Z |
| format | Conference item |
| id | oxford-uuid:ff35f958-6814-4f90-93cd-49962e05f965 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T06:59:22Z |
| publishDate | 2000 |
| record_format | dspace |
| spelling | oxford-uuid:ff35f958-6814-4f90-93cd-49962e05f9652022-03-27T13:43:01ZMuon Korringa relaxationConference itemhttp://purl.org/coar/resource_type/c_5794uuid:ff35f958-6814-4f90-93cd-49962e05f965Symplectic Elements at Oxford2000Cox, SCottrell, SCharlton, MDonnelly, PBlundell, SSmith, JCooley, JSignificant muon spin-lattice relaxation is found in a number of non-magnetic semimetals and metals. Measured in longitudinal magnetic field, the relaxation rate is independent of field up to several kilogauss and generally increases monotonically with temperature. This suggests a form of Korringa relaxation, originating in the hyperfine interaction between the implanted muons and the conduction electrons. Bearing in mind that NMR data on Korringa relaxation refers chiefly to the host nuclei, the muon offers a probe of conduction-electron encounter at an interstitial site, linking the topic to the nature of defect screening in metals, to relaxation by spin-density fluctuations in magnetic materials and to spin- and charge-exchange on paramagnetic muonium centres in semiconductors. Data are presented for C (graphite), Bi, Pb and Cd and compared with the Korringa predictions using known values of the muon Knight shift. Control experiments are described on Zn and Cu, both pure and deliberately doped with magnetic impurity. For graphite, an interpretation is given in terms of charge-exchange on a molecular radical formed by the chemical reaction of interstitial muonium. (C) 2000 Elsevier Science B.V. All rights reserved. |
| spellingShingle | Cox, S Cottrell, S Charlton, M Donnelly, P Blundell, S Smith, J Cooley, J Muon Korringa relaxation |
| title | Muon Korringa relaxation |
| title_full | Muon Korringa relaxation |
| title_fullStr | Muon Korringa relaxation |
| title_full_unstemmed | Muon Korringa relaxation |
| title_short | Muon Korringa relaxation |
| title_sort | muon korringa relaxation |
| work_keys_str_mv | AT coxs muonkorringarelaxation AT cottrells muonkorringarelaxation AT charltonm muonkorringarelaxation AT donnellyp muonkorringarelaxation AT blundells muonkorringarelaxation AT smithj muonkorringarelaxation AT cooleyj muonkorringarelaxation |