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

Autor:	I.A. Shaikh, D. G. Kuberkar, J.A. Bhalodia, G.J. Baldha, R.G. Kulkarni, Utpal S. Joshi
Rok vydání:	1995
Předmět:	Magnetization Hysteresis Nuclear magnetic resonance Materials science Flux pinning Transition temperature Analytical chemistry General Physics and Astronomy Flux General Materials Science Magnetic susceptibility Stoichiometry Magnetic flux
Zdroj:	Cryogenics. 35:61-65
ISSN:	0011-2275
Popis:	Hf and Ca substituted samples with stoichiometric compositions (Y1 − xHfx)Ba2Cu3Oz with x = 0.0, 0.1, 0.2 and (Y0.85 − yCayHf0.15)Ba2Cu3Oz 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 Tc. 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 Jc has been deduced from hysteresis data which is discussed in the light of the flux creep model.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6943788d1b9ca9a09d4915bd0042f7a1 https://doi.org/10.1016/0011-2275(95)90427-h Zobrazit plný text záznamu Full Text from ScienceDirect