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Enhanced flux pinning and critical currents by Hf and Hf-Ca substitution in YBa2Cu3O7 − δ

✍ Scribed by G.J. Baldha; I.A. Shaikh; D.G. Kuberkar; J.A. Bhalodia; U.S. Joshi; R.G. Kulkarni

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
503 KB
Volume
35
Category
Article
ISSN
0011-2275

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✦ Synopsis

Hf and Ca substituted samples with stoichiometric compositions (Y,_,Hf,,)Ba,Cu,O, with x=0.0, 0.1, 0.2 and (Y o.ss_vCa,Hf,.,,)Ba,Cu,O, with y= 0.1, 0.2, 0.4, respectively, prepared under identical conditions have been characterized by d.c. magnetization and thermogravimetric analysis measurements. Detailed magnetization measurements on randomly orientated powdered samples as a function of temperature and field exhibit pronounced M(H) hysteresis loops, indicative of large flux pinning, even as T approaches T,. It is believed that the flux pinning arises due to the preferential substitution of Hf or Hf-Ca on the Y site, which acts as a pinning centre. The critical current density J, has been deduced from hysteresis data which is discussed in the light of the flux creep model.

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