Anomalous electrical properties of linear chain mercury compounds |
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Authors: | CK Chiang R Spal A Denenstein AJ Heeger ND Miro AG MacDiarmid |
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Institution: | Department of Physics and Laboratory for Research on the Structure of Matter, USA;Department of Chemistry and Laboratory for Research on the Structure of Matter University of Pennsylvania, Philadelphia, PA 19104, USA |
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Abstract: | The electrical resistivity of Hg2.86AsF6 has been studied as a function of temperature. At room temperature, the resistivity along the chain direction is 10?4 Ω-cm with an anisotropy of about 102. This incommensurate linear chain system remains metallic at low temperatures with resistance ratio ?ab(300 K)/ ?ab(1.4 K) ? 3000 and still increasing with no apparent sign of residual resistivity. A large anisotropic magnetic field dependence of the resistivity is observed below 30 K. Near 4 K, the c-axis resistance drops abruptly more than three orders of magnitude, apparently to zero, while ?ab is continuous. The c-axis transition is suppressed in a small magnetic field. |
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