Superconductivity with a maximum Tc, zero of 58 K for x &gt; 0·75 has been observed in a nominal starting composition, Thx Tl2Sr2Ca2Cu3Oy . X-ray data show that the 1212 phase gets stabilized due to part substitution of Th at the Tl-site for x≥0·25; however, Tc is low for x&lt;0·75. © 1991 Indian Academy of Sciences.

Upadhyayula V Varadaraju

Department Of Chemistry

K. Antony Thomas

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IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

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IIT Madras

Superconductivity studies on Tl-Th-Sr-Ca-Cu-O system

Bulletin of Materials Science

Studies on MTl2 Sr2 Ca2 Cu3 Oy (M = Rare Earth, Y, Sc, Pb, Bi and Th) show that superconductivity in the range 40-77K can be achieved in this system depending on the M-ion. The minimum amount of rare earth required to show a Tc ∼ 70K appears to be 25 mole percent. X-ray studies confirm the single phase material responsible for high Tc superconductivity to be 1212 type. It appears that Pb, Bi and Th substitute at the Tl- site whereas the rare earths, Y and Sc prefer the Ca- site. © 1990.

Materials Research Bulletin

Superconductivity studies on the MTlSrCaCuO (M = Rate Earth, Sc, Y, Pb, Bi, Th) system

Superconductivity with a Tc,zero at 75 ± 1 K has been observed in TlMBaCuO (M = Ce, Th) system for a starting nominal composition of Tl2.2M1Ba2Cu3Oy. X-ray data show that the compounds are multiphasic with the 2201 phase as the predominant one which is responsible for superconductivity. Lower Tc values are noted for M = Pr and Tb. Only metallic behavior is observed for pure Tl2Ba2Cu1Oy and M = Pb or (Pb + Sb) or Te containing phases down to 15 K. © 1990.

Journal of Solid State Chemistry

Superconductivity studies on TlMBaCuO (M = Ce, Th, Pr, Tb, Pb, and Te) system

Physical Review B

Superconducting (1:1:2:2)-type layered cuprates of the formulaTlCA1−xLxSr2Cu2Oy(L=Y or rare-earth element)

The Journal of Physical Chemistry

Physical chemistry of high-temperature oxide superconductors

Solid State Communications

The crystal structure and superconductivity of new superconducting phase TlSr2Ca0.5Sm0.5Cu2O6.75

Journal	Data powered by TypesetBulletin of Materials Science
Publisher	Data powered by TypesetSpringer India
ISSN	02504707
Open Access	Yes