Occurrence of maximum Tc at an optimal carrier concentration in superconducting bismuth and thallium cuprates

The superconducting transition temperatures in Bi2Ca(1-x)Ln(x)Sr2Cu2O(8 + delta), TlCa(1-x)Ln(x)Sr2Cu2O(6 + delta), and Tl(0.8)Ca(1-x)Ln(x)Ba2Cu23O(6 + delta) (Ln = Y or rate earth) vary with composition and show a maximum at a specific value of x or delta. This observation suggests that an optimal...

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Veröffentlicht in:	Applied physics letters 1990-01, Vol.56 (5), p.487-489
Hauptverfasser:	SOMASUNDARAM, P, VIJAYARAGHAVAN, R, NAGARAJAN, R, RAM SESHADRI, URMAJI, A. M, RAO, C. N. R
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology Physics Properties of type I and type II superconductors Superconductivity
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Zusammenfassung:	The superconducting transition temperatures in Bi2Ca(1-x)Ln(x)Sr2Cu2O(8 + delta), TlCa(1-x)Ln(x)Sr2Cu2O(6 + delta), and Tl(0.8)Ca(1-x)Ln(x)Ba2Cu23O(6 + delta) (Ln = Y or rate earth) vary with composition and show a maximum at a specific value of x or delta. This observation suggests that an optimal carrier concentration is required to attain maximum Tc in such cuprates, which seem to be two-band systems. (Author)
ISSN:	0003-6951 1077-3118
DOI:	10.1063/1.103296