Peculiarities in acoustic properties of Bi1.4Pb0.6Ca2Sr2Cu3O<i>y</i> ceramics
A. L. GaǐdukPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov and State Scientific and Technical Enterprise “Gelii” attached to the Physicotechnical Institute of Low Temperatures, KharkovV. D. FilPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov and State Scientific and Technical Enterprise “Gelii” attached to the Physicotechnical Institute of Low Temperatures, KharkovN. G. BurmaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov and State Scientific and Technical Enterprise “Gelii” attached to the Physicotechnical Institute of Low Temperatures, KharkovE. A. MasalitinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov and State Scientific and Technical Enterprise “Gelii” attached to the Physicotechnical Institute of Low Temperatures, KharkovВ. І. ДоценкоPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov and State Scientific and Technical Enterprise “Gelii” attached to the Physicotechnical Institute of Low Temperatures, KharkovM. N. SorinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov and State Scientific and Technical Enterprise “Gelii” attached to the Physicotechnical Institute of Low Temperatures, KharkovN. M. ChaikovskayaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov and State Scientific and Technical Enterprise “Gelii” attached to the Physicotechnical Institute of Low Temperatures, KharkovA. M. GurevichPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov and State Scientific and Technical Enterprise “Gelii” attached to the Physicotechnical Institute of Low Temperatures, KharkovV. N. EropkinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov and State Scientific and Technical Enterprise “Gelii” attached to the Physicotechnical Institute of Low Temperatures, KharkovА. И. СмирновPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov and State Scientific and Technical Enterprise “Gelii” attached to the Physicotechnical Institute of Low Temperatures, Kharkov
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Annotatsiya
Anomalies in the velocity and attenuation of sound and in heat capacity are observed in Pb-stabilized Bi 2-2-2-3 ceramic at a temperature ∼60 K. These anomalies are interpreted as a second-order phase transition. The sensitivity of the anomalies to a frozen magnetic flux points to the magnetic origin of the transition. Similar peculiarities at the same temperature are also observed in l–2–3*-type superconducting compounds.
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