Specific-heat measurements on superconducting bi-ca-sr-cu and tl-ca-ba-cu oxides: absence of a linear term in the specific heat of bi-ca-sr-cu oxides

R. A. Fisher; S. Kim; S. E. Lacy; N. E. Phillips; D. E. Morris; A. G. Markelz; J. Y. T. Wei; D. S. Ginley

doi:10.1103/PhysRevB.38.11942

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Specific-heat measurements on superconducting bi-ca-sr-cu and tl-ca-ba-cu oxides: absence of a linear term in the specific heat of bi-ca-sr-cu oxides

R. A. Fisher, S. Kim, S. E. Lacy, N. E. Phillips, D. E. Morris, A. G. Markelz, J. Y. T. Wei, D. S. Ginley

DOI 10.1103/PhysRevB.38.11942 · Physical Review B

T1

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Abstract

Specific-heat data, extending from 0.4 to 120 K, in both a zero field and at 7 T, are reported for five samples of Bi-Ca-Sr-Cu oxide and one of Tl-Ca-Ba-Cu oxide. The occurrence of bulk superconductivity in all six samples is shown by Meissner-effect measurements, and confirmed for the Tl sample and two Bi samples by the specific-heat data. In a zero field, the Tl sample shows a contribution to the specific heat that is linear in temperature and comparable to those reported for YBa2Cu3O7. For all samples of the Bi compound the linear term is zero within the experimental uncertainty, and is at least an order of magnitude smaller.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
TlCaBaCu2O5.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	114	Pressure not reported	onset
TlCaBaCu2O5.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	114	Pressure not reported	onset
Bi2.15Ca1.17Sr1.68Cu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	80	Pressure not reported	onset
Bi2CaSr2Cu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	84	Pressure not reported	onset
Bi2Ca2Sr2Cu4O11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	110	Pressure not reported	onset
Bi2Ca2Sr2Cu4O11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	95	Pressure not reported	onset
Bi2Ca2Sr2Cu4O11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	110	Pressure not reported	onset
Bi2Ca2Sr2Cu4O11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	95	Pressure not reported	onset
Bi2Ca6Sr2Cu8O19 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	110	Pressure not reported	onset
Bi2Ca6Sr2Cu8O19 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	80	Pressure not reported	onset
Bi2Ca6Sr2Cu8O19 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	110	Pressure not reported	onset
Bi2Ca6Sr2Cu8O19 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	80	Pressure not reported	onset
Bi2CaSr2Cu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	84	Pressure not reported	onset