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Conductivity measurements reflect vortex solid melting in YBCO films.Field-independent glass exponents nu_g=1.9 and z_g=4.0 describe the transitionT_g(H) for 0<H<26 T. At low fields, 3D XY exponents nu_{XY}=0.63 andz_{XY}=1.25 are also observed, with z_{XY} smaller than expected. These competewith glass scaling according to multicritical theory. A predicted power-lawform of T_g(H) is observed for 0.5T_c<T_g<T_c. For T_g<0.5T_c, 3D XY scalingfails, but a lowest Landau level analysis becomes possible, obtaining T_{c2}(H)with positive curvature.Comment: 4 pages, 5 .eps figures, To be published in Phys. Rev. Let

physical review letters

3D<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">XY</mml:mi></mml:math>and Lowest Landau Level Fluctuations in Deoxygenated<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:…

3DXYand Lowest Landau Level Fluctuations in DeoxygenatedYBa2Cu3