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Title: Change in the order of the melting transition with oxygen content in YBa2Cu3O7-δ
Authors: Rykov, A.I.
Tajima, S.
Kusmartsev, F.V.
Forgan, E.M.
Simon, Ch.
Issue Date: 1999
Publisher: © American Physical Society
Citation: RYKOV et al, 1999. Change in the order of the melting transition with oxygen content in YBa2Cu3O7-δ. Physical Review 60(10), pp 7601–7606
Abstract: The vortex phase transition was systematically studied in twin-free YBa2Cu3O7-δ for various δ. For 7-δ>~6.94, the first order transition was evidenced by an abrupt jump and a hysteresis of magnetization in the field-cooled (FC) cooling-warming cycles, which indicates the coexistence of vortex crystallites and liquid. For 7-δ<6.89 the jump was not sharp and FC magnetization was reversible, suggesting a second order transition. The first and the second order transitions merge at a critical point (CP) which goes to zero field for 7-δ<6.89. Three-dimensional XY scaling satisfactorily fits the data at 1–7 T for 7-δ<6.94 and for 7-δ<6.89, but does not fit for 6.89<7-δ<6.94, where the CP passes through this field range.
Description: This article was publsihed in the journal, Physical Review B [© American Physical Society]. It is also available at: http://link.aps.org/abstract/PRB/v60/p7601.
URI: https://dspace.lboro.ac.uk/2134/1307
ISSN: 0163-1829
Appears in Collections:Published Articles (Physics)

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