Temperature dependences of the first critical field and critical current in the untwinned TmBa2Cu3Ox superconducting single crystals

✍ Scribed by V.V. Moshchalkov; A.A. Zhukov; D.K. Petrov; V.I. Voronkova; V.K. Yanovskii

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 479 KB
• Volume: 166
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(90)90571-u

✦ Synopsis

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 temperature is a linear function with a slope of about 22 Oe/K for Hllc and 3.1 Oe/K for HIJo. Angular dependences of the Meissner magnetic susceptibility and H,, in the (bc)-plane were studied. The expression derived in the ellipsoid approximation shows good agreement with these data. Temperature dependences of the critical current j,( T) are also measured. Different types of single crystals are used, including the monodomain crystal. For all samples the jJ T) curves follow the exponential dependence j,( T)=j,(O)exp( -T/T,) with a j,(O) value of about (2-3)