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VOLUME 75, NUMBER 7 P H Y S I C A L R E V I E W L E T T E R S 14 AUGUST 1995 Keimer et al. Reply: We have recently reported a de-
 

Summary: VOLUME 75, NUMBER 7 P H Y S I C A L R E V I E W L E T T E R S 14 AUGUST 1995
Keimer et al. Reply: We have recently reported a de-
termination of the vortex lattice structure in YBa2Cu3O7
in magnetic fields up to 5 T by high resolution small an-
gle neutron scattering [1]. The vortex lattice is oblique,
with an angle of b 73
between lattice vectors and lat-
tice constants which are equal to within our experimental
resolution. This structure had not been resolved in ear-
lier low resolution measurements in lower fields [2]. By
qualitatively adapting earlier theories for cubic supercon-
ductors, we noticed that such a structure would arise as
a consequence of a fourfold coherence length anisotropy
in sufficiently high magnetic fields. This conjecture has
been substantiated recently by detailed calculations [3];
the question is at which field these core effects begin to
become relevant. Since this question has thus far not been
addressed by theory, we performed standard magnetic free
energy calculations in the London model and found that
the free energy becomes sensitive to the presence of the

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science