Muon state dynamics in germanium and silicon |
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Authors: | R Scheuermann L Schimmele J Schmidl A Seeger Th Stammler EE Haller D Herlach J Major |
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Institution: | (1) Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, UK;(2) Institute for Solid State Physics, University of Tokyo, Roppongi, Minato‐ku, Tokyo 106, Japan |
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Abstract: | We have carried out implanted positive muon studies on the molecular metal system dn- (DMe-DCNQI)2 Cu in order to understand better its novel magnetic properties. Examples of these salts at different levels of deuteration
were studied. The fully deuterated ( d8) salt shows a metal–insulator (MI) transition around 80 K and a magnetic transition around 7 K. The muon spin relaxation
rate is enhanced below the MI transition, reflecting the localisation of spins along the Cu columns, however, the increase
in muon spin relaxation rate occurs well above the metal–insulator (MI) transition and suggests a slowdown of the spin fluctuations
around 120 K. At temperatures below 7 K a zero field precession signal was observed as a result of the 3D magnetic ordering
of the Cu spins. For a muon site associated with the ring of the DCNQI molecule, the local field distribution was found to
be consistent with the previously proposed magnetic structure. A sharp nuclear quadrupolar level crossing resonance (QLCR)
was observed at 50 G which was assigned to resonance with the imine nitrogen on the DCNQI molecule.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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