Nonequilibrium quasiparticle relaxation in the vortex state of La2-xSrxCuO4.
We have measured the charge dynamics in the vortex state of La(2-x)Sr(x)CuO(4) by femtosecond time-resolved reflectance, which we demonstrate to be a direct probe of low-energy quasiparticle states. Application of a c-axis magnetic field induces regions surrounding vortex cores that display pseudogap charge dynamics. We determine the characteristic width approximately 130 A in optimally doped material and we show that it increases with decreasing doping. These results confirm a new experimental method of probing the microscopic properties of vortices in the cuprates.
Bianchi
G
G
Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK.
Chen
C
C
Nohara
M
M
Takagi
H
H
Ryan
J F
JF