J. Axnas et al., DENSITY-OF-STATES FLUCTUATIONS IN THE C-AXIS MAGNETOCONDUCTIVITY OF YBA2CU3O7-DELTA, Czechoslovak journal of Physics, 46, 1996, pp. 2029-2030
The magnetoresistivity up to 12 T of YBa2Cu3O7-delta has been measured
with B//I//c from T-c + 3 K to T-c + 40 K. A change of sign was obser
ved, from positive near T-c to negative at temperatures above approxim
ately T-c + 10 K. This previously not reported change of sign can be e
xplained by recent fluctuation theories that include fluctuations in t
he normal density of states (DOS).