High-pressure synthesis and superconductivity of a Ba free mercury-based superconductor (Hg0.75Re0.25)Sr2Ca2Cu3Oy

Influence of neutron-irradiation-induced defects on the flux pinning inHgBa2Ca2CuWiśniewski1, Puźniak2, Karpiński3 et al. 2000Phys. Rev. B20350View full textAdd to dashboardCite

“…9͒ and ͑2͒ the chemical substitution at the Hg site may make the blocking layer more metallic. 10 The possibility that extended defects in a chemically substituted HgSr 2 CuO 4ϩx compound could act additionally as pinning centers was also explored. 11 Studies of grain-aligned Hg 1Ϫx Re x Ba 2 Ca 2 Cu 3 O 8ϩx samples 12 showed that Re substitution enhances bulk pinning at low temperatures.…”

Growth of Hg/sub 0.9/Re/sub 0.1/Ba/sub 2/Ca/sub 2/Cu/sub 3/O/sub 8+x/ on a metallic substrate

“…Partial substitution of rhenium for mercury has greatly enhanced the chemical stability of HgBa2Ca2Cu3Oe+, [3]. (Hg,Re) 1223 forms within a drastically broadened stable phase region in T -P ( H g ) -P ( 0 2 ) space, is far less sensitive to chemical impurities in the precursor, and demonstrates no degradation in superconducting properties after long-term exposure to moist air [4].…”

Structural and Superconducting Properties of Hg0.75Re0.25Ba2−xSrxCa2Cu3O8+δ Superconductors Grown by Sol–Gel and Sealed Quartz Tube Synthesis

“…Nevertheless, the overdoped degree of our samples is very low (taking into account the ¹ value at ambient pressure), compared to the data reported in Refs. (10,40). This could mean that the overdoping is obtained under the thermal treatment conditions applied in the synthesis process.…”

“…Nevertheless, other works (10,40) show superconductivity at 109 K for a (Hg,Re)-1223 system with a total strontium substitution with a sealed-tube technique and ¹ rises to 114 K after annealing in a reducing atmosphere (10% H /90% N ) (10). In the same way, for a sample prepared under high pressure ¹ goes up to 120 K after a vacuum annealing (40). Therefore, certainly these samples are strongly overdoped.…”