Interplane conductivity

In the optical conductivity, the pseudogap state reveals itself in two distinct ways (i) the in-plane scattering rate at m < 700 cm is reduced which inevitably leads to reduction of the in-plane resistivity (see discussion in sect. 4.3) (ii) the interplane conductivity is reduced at 0 < 250 cm which accounts for semiconducting behavior of the c-axis resistivity (see discussion in sect 4.5). Despite the difference in the energy scales seen in the in-plane and interplane transport, these two effect are clearly coimected (Takenaka and Uchida 1994, Basov et al. 1996). 

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