A ug 1 99 9 First order phase transition of the vortex lattice in twinned YBa 2 Cu 3 O 7 single crystals in tilted magnetic fields

The Vortex State in YBa 2 Cu 307 _ y System +

We have studied the vortex state problem systematically in YBa2CusOr-, system with twinned/untwinned single crystals. Different vortex states are observed on samples with different characteristics. Our detailed I V characteristics measured in different magnetic fields, at temperature below where the resistive ìkneeî occurs, show that the dynamics of the vortex motion depends on the sample chara...

Comment on "Strong vortex liquid correlation from multiterminal measurements on untwinned YBa(2)Cu(3)O(7-delta) single crystals".

YBa 2 Cu 3 O 7−δ Single Crystals " From recent transport experiments A.Rydh and¨O.Rapp [1] (RR) claim that the vortex liquid in untwinned YBa 2 Cu 3 O 7−δ crystals is correlated above the melting transition, in striking contrast to previous work [2]. In this Comment we present new measurements using the same experimental technique on twinned and untwinned YBa 2 Cu 3 O 7−δ crystals with similar ...

Growth of YBa,Cu,O, single crystals from a mixture of YBa,Cu,O,, and Ag,O

Single crystals of the superconductor YBa$usO,, have been grown from a mixture of solid phase YBa,CusO,, and liquid phase silver. Crystals with a thickness of up to 1 mm along the c axis can be obtained when the mixture is soaked at 1005 “C for more than 8 h. Silver melt enhances the peritectic partial melting of the YBa&usO,, solid phase, and induces the solution and reprecipitation process du...

02 v 1 1 J ul 1 99 4 The Abrikosov Flux Lattice in Planar Crystals of YBa 2 Cu 3 O 7 − δ

ar X iv : c on d - m at / 9 51 11 30 v 1 2 7 N ov 1 99 5 Superconducting state properties of a d - wave superconductor with mass anisotropy

YBa 2 Cu 3 O 7 (YBCO) exhibits a large anisotropy between the a and b axes in the CuO 2 planes because of the presence of CuO chains. In order to account for such an anisotropy we develop a Ginzburg-Landau (GL) theory for an anisotropic d-wave superconductor in an external magnetic field, based on an anisotropic effective mass approximation within CuO 2 planes. The anisotropic parameter λ = m x...