Electronic properties of ortho-polymer A1C60 (A = K,Rb) and related phases |
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| Authors: | Petit P Fischer JE |
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| Institution: | (1) Institut Charles Sadron, 6 rue Boussingault, 67000 Strasbourg, France (Fax: +33-03/8841-4099, E-mail: pp@leto.u-strasbg.fr), FR;(2) Material Science Department and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19014-6272, USA (Fax: +1-215/73-2128, E-mail: fischer@sol1.lrsm.upenn.edu), US |
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| Abstract: | 1 C60. Its singular structural, magnetic and electrical properties greatly enhanced the study of the AC60 phases (A = Rb, K and \chem{Cs}). We report our continuous wave (cw) ESR results on the structural phase transformations,
phase instabilities and the related kinetics of K1C60. We quantitatively explain the origin of the difference between Rb1C60 and K1C60 phase diagrams. The stability of OP-Rb1C60 together with the narrowness of its homogenous cw-ESR linewidth in the temperature range allow to perform pulsed ESR experiments. Pulsed ESR experiments measure precisely both the electronic spin-spin () and spin-lattice () relaxation times. Above , the equality of and , which are the only contributions to the cw-ESR linewidth, constitutes a convincing evidence of the metallic nature of OP-Rb1C60. The drastic increase (decrease) of the linewidth () below \valunit{40}{K} is interpreted in terms of an \qut{electronic dimerization}.
Received: 12 September 1996/Accepted: 14 November 1996 |
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| Keywords: | PACS: 71 30+h 76 30 82 60 |
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