c-axis negative magnetoresistance and upper critical field of
H. H. Wills Physics Laboratory, University of Bristol - Bristol BS8 1TL,
2 Kapitza Institute for Physical Problems - 2 Kosygina Str., 117334 Moscow, Russia
3 Department of Physics, Loughborough University - Loughborough LE11 3TU, UK
Accepted: 25 May 2000
The out-of-plane resistance and the resistive upper critical field of BSCCO-2212 single crystals with –93 K have been measured in magnetic fields up to 50 T over a wide temperature range. The results are characterised by a positive linear magnetoresistance in the superconducting state and a negative linear magnetoresistance in the normal state. The zero-field normal-state c-axis resistance, the negative linear normal-state magnetoresistance, and the divergent upper critical field are explained in the framework of the bipolaron theory of superconductivity.
PACS: 74.20.-z – Theories and models of superconducting state
© EDP Sciences, 2000