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Anisotropy of lower critical field and critical currents in YBa2Cu3O6+x single crystal

✍ Scribed by C. Marin; V.V. Moshchalkov; J.Y. Henry; J. Rossat-Mignod; J.F. Jacquot

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 172 KB
Volume: 185-189
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(91)91059-d

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✦ Synopsis

The anisotropy of the first critical field Hcl is found to increase from H/c/~(0)/H~I(0)=4 to I0 on going to x=0.93 llc to. x=0.64 . For x=0.93, Hcl(0)=(950-+200)Oe, Hc1~( 0)=(230+20)Oe. For x=0.64, H/~(0)=(270-+30)Oe, .LC + Hc1(0)=(27-2)Oe. An anomalous linear T-dependence was found for H//c at low temperatures. Critical currents Jc were also determined showing a jc(T)=joexp(-T/To ) dependence and an important anisotropy (for x=0.93, Jol=106A/cm 2 (in a-b planes), Jo2=1.4 10aA/cm z (along c axis); for x=0.64, Joi=3.6 105A/cm 2, Jo2=2.2 104A/cm2). The anisotropy ratio Jol/Jo2 is enhanced from 7 (x=0.93) to 16 (x=0.64).

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