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[Top panel] The Nernst signal in the vortex state of LaSrCuO (x = 0.10) at temperatures T from 12 to 35 K. At low temperatures (12 K curve), the Nernst signal E_y is initially zero until
H
exceeds the value at which the vortex solid becomes a liquid (~2.5 T at 12 K). The signal then increases as
E = B x v
_L. As
T
increases, the melting field moves to lower fields, becoming zero near
T
c (27 K). Above
T
c, however, the Nernst signal remains a significant fraction of the value at
T
c (35 K curve). The lower panel shows that the Nernst signal decreases relatively slowly with increasing
T
. Above 140 K, it asymptotes to a negative value that we identify with the normal-state value
vN
. [Xu et al., Nature 2000].
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