Superconductivity up to 126 Kelvin in Interstitially Doped Ba ₂ Ca _{n - 1} Cu _n O _x [02( n -1) n -Ba]

Abstract

M NaC 10 mM phosphate. pH 7.0) were mlxed, Acids Res. 16, 4937 (1 988)l. frozen (40 s), thawed (5 mni, and spotted with a 18. We acknowledge suppot? by grants from the Nationcapillary tube on a C, , TLC plate A blue spot deve-al Institute of General Medical Sc~ences (GM 10265) oped, In the absence of target, the color remaned and the Offce of Naval Research (NO01 4-94-1 -0703 pnk. For comparison, the lower Imlt for detectng an and N00014-97-10430) and the Department of De-ol~gonucleot~de with the use of a probe labeled with fense (MUR DAAG 55-97-1 -01 33). fluorescein In a sandwich hybridization system was reported to be 500 fmol [M. S. Urdea el a/. , R~ucleic A new high-temperature superconducting compound system, Ba,Can-,CunO,[02(n-1) n-Ba] interstitially doped with calcium or (Ca,Cu) has been identified to exhibit a transition temperature up to 126 kelvin, the highest for a superconductor without a volatile toxic element. 02(n-1)n-Ba has body-centered tetragonal symmetry and an unusual chargereservoir block. The compounds offer interesting opportunities for high-temperature superconductivity science and technology.

The superconductor (Tl,Hg,Ca)2(Ba,Sr)2(Ca,Sr,Tl)Cu2O7.6

“…The maxima are tolerable considering the high electron densities already present at the AE2 site. This highpressure synthesis study agrees with previous reports concerning mixed sites (Chu et al, 1997;Wu et al, 1998), i.e. Cu as well as Ca enter the CR and Tl can be found at the AE1 site.…”

“…Both Tl and Hg were earlier observed at the AE1 site in a high-pressure synthesized 2212-type phase (Wu et al, 1998), however, Wu et al reported this as a new stacking order. The CR on the other hand was occupied by both Ca and Cu in another superconducting material, also formed under high-pressure conditions (Chu et al, 1997). Since our crystal was synthesized under pressure as well, Ca was introduced at the CR site at the same time as a minor amount of Tl was placed at the AE1 site.…”

New superconducting materials discovered via high pressures technology

“…成的T c 推高到126 K [16] , 接近常压T c 最高的Hg1223 [4] . 通过与赵忠贤老师合作, 我们表征了"铜系"和 "卤系"铜基超导材料的临界电流密度性能 [10] , 如图 7所示"铜系"和"卤系"具有优良的高温临界电流密度 特性.…”

Electrophoretic Route to Bi2Sr2CaCu2O8+y Films and Microfibers from Superconducting Colloids

“…[2,6] Cuprate superconductors with high superconducting transition temperatures (T c s) could also be considered as typical lamellar oxides, in which the superconducting CuO 2 blocks are regularly interstratified with charge-reserving blocks. [7] However, it is well known that their interlayer bonding characteristics are strongly covalent, with the exception of Bi-based superconductors [8] whose properties are closely related to the different electronic configurations of the component metal ions.…”