Local Pairs in High-Temperature Superconductors: Proof of Existence and Manifestation in Heat Transfer

Frolov, V. A.; Sokolenko, V. I.

doi:10.1134/s0021364018070020

Cited by 5 publications

(4 citation statements)

References 18 publications

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“…Mentioned four anomalies indicate: i) on staged character of temperature evolution of the Δ*, that agreeing with [24][25][26][27], and ii) on appearance of additional canal of heat carriers scattering in the PGS. Analogous data was obtained concern of thermal conductivity of Bi 1.6 (Pb 0.4 )Sr 2 Ca 2 Cu 3 O 10+х in PGS [5].…”

Section: Thermal Conductivity Anomalies Of the High-temperature Super...supporting

confidence: 77%

“…One of variants of ER was applied [5][6][7] to decision of number of actual physical problems. In the capacity of thermal field (TF) which gave sample temperature T s was utilized the gradient thermal field of gaseous nitrogen over liquid one being in vertically oriented metallic Dewar vessel ~ 500 mm, inner diameter ~ 60 mm.…”

Section: The Experiment's Conducting For Express Registration Of the ...mentioning

confidence: 99%

“…In connection with account we measured the temperature dependences δΤ 0 /δΤ(Т)Ҝ(Т)/Ҝ 0 k(Т)/k 0 in range ~ 300…77 К for HTSCs Bi 1.6 (Pb 0.4 )Sr 2 Ca 2 Cu 3 O 10+х and YBa 2 Cu 3 O 7-x [5,6] using ER method. On Fig.…”

Section: Thermal Conductivity Anomalies Of the High-temperature Super...mentioning

confidence: 99%

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The Express Registration of Thermal Conductivity Anomalies of Solids

Sokolenko¹,

Frolov²,

Savchuk³

2022

Problems of Atomic Science and Technology

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Investigation of the thermophysical characteristics of materials at low temperatures (T ≤ ,  is the Debye temperature) makes it possible to obtain information on the interaction of quasiparticles and is in demand in the applied plan. For the indicated temperatures, a method of express registration (ER) of anomalies in the thermal conductivity of solids (k), which is a variation of the classical method of uniaxial stationary heat flux (USHF), but which, unlike the prototype, does not require taking into account heat losses (HL). A feature of the ER method is the measurement of the temperature dependence of the difference δΤ = T1−T2 between the ends of the sample under conditions of simultaneous monotonicity of the change in Т of the sample and all HL. In this case, the measured scaled thermal conductivity Ҝ(Q/Ψ)/δΤ (Ψ is a monotonic scale factor in T) correlates with the real kQ/δΤ. For the interval 300…77 K, one of the variants of the ER method was tested, in which a step-by-step movement of the sample in a column of gaseous nitrogen above the surface of liquid N2 in a Dewar vessel was used. In the case of a monotonic change in the distance from the sample to the liquid, the formed configuration of isotherms ensures the monotonicity of the change in T of the sample and, at the same time, the monotonicity of the HL along the channels of thermal conductivity and radiation. The possibilities of the ER method are illustrated by examples of determining the temperatures and signs of anomalies in the thermal conductivity coefficients of high-temperature superconductors (HTSC) in the pseudogap state (PGS) and a high-entropy alloy Аl0.5CoCuCrNiFе, which is promising for use in the cryogenic temperature range. The method made it possible for the first time to discover the staging of the temperature evolution of the thermal conductivity of YBa2Cu3O7-x and Bi1.6(Pb0.4)Sr2Ca2Cu3O10+х in the PGS and to determine the temperatures and signs of the anomalies. The data obtained convincingly confirmed the results of probing the PGS of HTSCs by the method of polarized neutron scattering carried out with the participation of a number of EU research institutes. Also, for the first time, an extended thermal conductivity anomaly of a high-entropy Аl0.5CoCuCrNiFе alloy in the range of ~ 220…170 K was discovered, which is probably a consequence of changes in the configuration of the Fermi surface.

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Section: Thermal Conductivity Anomalies Of the High-temperature Super...supporting

confidence: 77%

Section: The Experiment's Conducting For Express Registration Of the ...mentioning

confidence: 99%

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The Express Registration of Thermal Conductivity Anomalies of Solids

Sokolenko¹,

Frolov²,

Savchuk³

2022

Problems of Atomic Science and Technology

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show abstract

“…In these investigations the method of express recording thermal conductivity (k) anomalies was applied. Effectiveness of its was demonstrated by investigations of high temperature superconductors pseudogap state [15,16]. The method advantage is the absence of need to comply with the classical method of stationary uniaxial flow [17] on maintaining ideal sample thermal insulation and stationarity of supplying heat flux Q.…”

Section: Fig 1 Dependences R J (т)/R J0 and S J (т)/S J0 : а -J=сstmentioning

confidence: 99%