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The temperature dependence of the zero-field mean free path (mfp)
l(T)
in BZO-grown YBCO (y = 6.993) extracted from the weak-field Hall conductivity
k
xy^0/
B
, using two methods. In method 1 (solid symbols), the electronic heat capacity is used to fix the qp population. In method 2 (open symbols), the Hall angle is extracted from the ratio
k
xy/
k
xx^e, where
k
xx^e is the electronic part of the measured
k
xx values. The equivalent weak-field Hall angle \theta/
B
is shown on the right scale. The expanded scale (x 10) shows that the increase in
l (T)
starts quite abruptly just below
T
c. This behavior is inconsistent with the scattering rate of nodal qp deduced from a recent photoemission expteriment (Valla et al. Science, 1999). [Y. Zhang et al., cond-mat/00xxxx].
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