Substitution of La3+ in the BaO plane in TlBa2CaCu2O7 system reduces the hole carrier concentration in the CuO2 plane. The system TlBa2-xLaxCaCu2O7 has been synthesised and found to exhibit superconductivity with transition temperature Tc increasing from 80K for x=0.0 and passes through a maximum of 110K for x=0.3. Superconductivity is maintained even at higher substitutional levels (upto x=0.8) in contrast to RE3+ substitution at the Ca2+ site. © 1995.

Upadhyayula V Varadaraju

Department Of Chemistry

V. Badri

BARIUM COMPOUNDS

calcium

Carrier concentration

Electric conductivity measurement

Electron transport properties

Lanthanum

Structure (composition)

Substitution reactions

Superconductivity

Synthesis (chemical)

Thallium compounds

X ray diffraction analysis

HOLE CARRIER CONCENTRATION

SUBSTITUTIONAL LEVELS

High temperature superconductors

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Effect of La3+ substitution on the structure and superconductivity in TlBa2−xLaxCaCu2O7 (x=0.0 - 1.0)

Solid State Communications

Effect of La3+ substitution on the structure and superconductivity in TlBa2-xLaxCaCu2O7 (x=0.0 - 1.0)

Journal	Solid State Communications
ISSN	00381098
Open Access	No