Nature of the specific heat anomaly in the Bi and Tl high temperature superconductors

F. Seidler; P. Böhm; H. Geus; W. Braunisch; E. Braun; W. Schnelle; Z. Drzazga; N. Wild; B. Roden; H. Schmidt; D. Wohlleben; I. Felner; Y. Wolfus

doi:10.1016/0921-4534(89)90262-1

Nature of the specific heat anomaly in the Bi and Tl high temperature superconductors

F. Seidler, P. Böhm, H. Geus, W. Braunisch, E. Braun, W. Schnelle, Z. Drzazga, N. Wild, B. Roden, H. Schmidt, D. Wohlleben, I. Felner, Y. Wolfus

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Abstract

Specific heat, field cooling Meissner effect, isothermal magnetization, AC susceptibility and resistance were measured on sintered pellets of the Bi and Tl high temperature superconductors with nominal compositions BiPb_0.3SrCaCu₂O_5.8 and Tl₂Ba₂CaCu₂O₈, and for comparison on some pellets of the REBa₂Cu₃O_6.9 system. With decreasing field, the field cooling Meissner signals of the Bi and Tl systems approach the same magnitude and transition width (ΔT ≈ 2-3 K) as in high quality pellets of the REBa₂Cu₃O_6.9. The field and temperature dependence of the Meissner signals is analysed in detail. At the transition temperatures of five superconducting phases of the Bi and Tl pellets, the specific heat shows no jumps nor maxima, within the accuracy of the measurement (Δ(C/T) < mJ/(mol K²)). There are however sharp breaks of the slope of C/T at the T_c values, which are intrinsically as large as in the REBa₂Cu₃O_6.9. The transitions in the Bi and Tl systems look more like third order transitions rather than like the second order transitions of the REBa₂Cu₃O_6.9.

Original language	English
Pages (from-to)	375-394
Number of pages	20
Journal	Physica C: Superconductivity and its Applications
Volume	157
Issue number	3
DOIs	https://doi.org/10.1016/0921-4534(89)90262-1
State	Published - 1 Mar 1989
Externally published	Yes

Funding

We have profitedf rom discussioness peciallwy ith K. Baberschkaen dA. Junod, and also with J. Sznajd and E. Miiller-HartmannW. e thank G. Dietz for letting us use his Foner magnetometeTrh. is work was supportebdy Bundesministeriufmtir Forschungu nd Technologicc, ontract# 13N 5494, and by a grant from the US-Israel BinationaSl cienceF oundation.

Funders	Funder number
US-Israel BinationaSl cienceF oundation

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title = "Nature of the specific heat anomaly in the Bi and Tl high temperature superconductors",

abstract = "Specific heat, field cooling Meissner effect, isothermal magnetization, AC susceptibility and resistance were measured on sintered pellets of the Bi and Tl high temperature superconductors with nominal compositions BiPb0.3SrCaCu2O5.8 and Tl2Ba2CaCu2O8, and for comparison on some pellets of the REBa2Cu3O6.9 system. With decreasing field, the field cooling Meissner signals of the Bi and Tl systems approach the same magnitude and transition width (ΔT ≈ 2-3 K) as in high quality pellets of the REBa2Cu3O6.9. The field and temperature dependence of the Meissner signals is analysed in detail. At the transition temperatures of five superconducting phases of the Bi and Tl pellets, the specific heat shows no jumps nor maxima, within the accuracy of the measurement (Δ(C/T) < mJ/(mol K2)). There are however sharp breaks of the slope of C/T at the Tc values, which are intrinsically as large as in the REBa2Cu3O6.9. The transitions in the Bi and Tl systems look more like third order transitions rather than like the second order transitions of the REBa2Cu3O6.9.",

author = "F. Seidler and P. B{\"o}hm and H. Geus and W. Braunisch and E. Braun and W. Schnelle and Z. Drzazga and N. Wild and B. Roden and H. Schmidt and D. Wohlleben and I. Felner and Y. Wolfus",

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doi = "10.1016/0921-4534(89)90262-1",

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T1 - Nature of the specific heat anomaly in the Bi and Tl high temperature superconductors

AU - Seidler, F.

AU - Böhm, P.

AU - Geus, H.

AU - Braunisch, W.

AU - Braun, E.

AU - Schnelle, W.

AU - Drzazga, Z.

AU - Wild, N.

AU - Roden, B.

AU - Schmidt, H.

AU - Wohlleben, D.

AU - Felner, I.

AU - Wolfus, Y.

PY - 1989/3/1

Y1 - 1989/3/1

N2 - Specific heat, field cooling Meissner effect, isothermal magnetization, AC susceptibility and resistance were measured on sintered pellets of the Bi and Tl high temperature superconductors with nominal compositions BiPb0.3SrCaCu2O5.8 and Tl2Ba2CaCu2O8, and for comparison on some pellets of the REBa2Cu3O6.9 system. With decreasing field, the field cooling Meissner signals of the Bi and Tl systems approach the same magnitude and transition width (ΔT ≈ 2-3 K) as in high quality pellets of the REBa2Cu3O6.9. The field and temperature dependence of the Meissner signals is analysed in detail. At the transition temperatures of five superconducting phases of the Bi and Tl pellets, the specific heat shows no jumps nor maxima, within the accuracy of the measurement (Δ(C/T) < mJ/(mol K2)). There are however sharp breaks of the slope of C/T at the Tc values, which are intrinsically as large as in the REBa2Cu3O6.9. The transitions in the Bi and Tl systems look more like third order transitions rather than like the second order transitions of the REBa2Cu3O6.9.

AB - Specific heat, field cooling Meissner effect, isothermal magnetization, AC susceptibility and resistance were measured on sintered pellets of the Bi and Tl high temperature superconductors with nominal compositions BiPb0.3SrCaCu2O5.8 and Tl2Ba2CaCu2O8, and for comparison on some pellets of the REBa2Cu3O6.9 system. With decreasing field, the field cooling Meissner signals of the Bi and Tl systems approach the same magnitude and transition width (ΔT ≈ 2-3 K) as in high quality pellets of the REBa2Cu3O6.9. The field and temperature dependence of the Meissner signals is analysed in detail. At the transition temperatures of five superconducting phases of the Bi and Tl pellets, the specific heat shows no jumps nor maxima, within the accuracy of the measurement (Δ(C/T) < mJ/(mol K2)). There are however sharp breaks of the slope of C/T at the Tc values, which are intrinsically as large as in the REBa2Cu3O6.9. The transitions in the Bi and Tl systems look more like third order transitions rather than like the second order transitions of the REBa2Cu3O6.9.

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Nature of the specific heat anomaly in the Bi and Tl high temperature superconductors

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