Enhanced critical current density in overdoped HgBa[sub 2]CaCu[sub 2]O[sub 6+δ] superconducting thin films

Xie, Y. Y.; Wu, J. Z.
April 2003
Applied Physics Letters;4/28/2003, Vol. 82 Issue 17, p2856
Academic Journal
Overdoped HgBa[SUB2]CaCu[SUB2]O[SUB6+δ (Hg-1212) high-temperature superconducting thin films have been synthesized in a fluorine-assisted cation-exchange process followed by postannealing in flowing oxygen. The overdoped Hg-1212 thin films have lowered superconducting transition temperature T[SUBc] of about 114 -115 K. Critical current density J[SUBc], however, is nearly twice as that for optimally doped Hg-1212 films. The enhancement in magnetic irreversible field H[SUBirr] has also been observed in)the overdoped Hg-1212 films, while a similar scaling law of H[SUBirr] ∼ (1 - T/T[SUBc])[SUPn] with n = 1.2- 1.3 in field range below 1 T was observed for both optimally doped and overdoped samples. Such a fluorine-assisted cation-exchange process, hence, provides a simple practical route for achieving high-current carrying Hg-1212 films on oxide and metal substrates.


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