Abstract
Overdoped HgBa2CaCu2O6+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 Tc of about 114–115 K. Critical current density Jc, however, is nearly twice as that for optimally doped Hg-1212 films. The enhancement in magnetic irreversible field Hirr has also been observed in the overdoped Hg-1212 films, while a similar scaling law of Hirr∼(1−T/Tc)n 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.
Published Version
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