Temperature dependences of lower critical fields in TmBa2 Cu3O7−x single-crystals
✍ Scribed by V.V. Moshchalkov; O.V. Petrenko; A.A. Zhukov; A.A. Gippius; V.I. Voronkova; V.S. Belov; V.A. Rybachuk
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 90 KB
- Volume
- 162-164
- Category
- Article
- ISSN
- 0921-4534
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The critical field H,, of the monodomain TmBa2Cus0, superconducting single crystals are measured along all three crystallographic axes. These data determine, in the logarithmic approximation, the ratio of the penetration depths 1.:&,:1,= 1: 1. 7: 4.4 for T> 10 K the dependence of H,, on the temperat
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