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• W4309461503 abstract "The key thermodynamic characteristics of the pseudogap state in cuprate superconductors are reviewed. These include YBa 2 Cu 3 O 7− δ , Y 0.8 Ca 0.2 Ba 2 Cu 3 O 7− δ , YBa 2 Cu 4 O 8 , Bi 2 Sr 2 CaCu 2 O 8+ δ , La 2− x Sr x CuO 4 , and Tl 2 Ba 2 CuO 4 . The electronic specific heat was extracted using a differential technique, and the evolution of the specific-heat coefficient γ and electronic entropy S as a function of temperature, doping, and magnetic field reveals a canonical behavior summarized by the following. The normal-state gap which opens in the pseudogap domain apparently remains open to the highest temperatures investigated. The gap decreases in magnitude with increasing doping and closes abruptly at a critical doping of p ≈ 0.19 holes/Cu, independent of temperature. In this picture, the pseudogap is separated from the pseudogap-free region of the phase diagram by a vertical line similar to the vertical line separating the incoherent and coherent antinodal quasiparticle states found in ARPES. The important role of fluctuations is evident by a diverging enhancement of γ ( T ) on either side of T c , and this enables extraction of the mean-field transition temperature <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=m1><mml:msubsup><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mtext>c</mml:mtext></mml:mrow><mml:mrow><mml:mtext>mf</mml:mtext></mml:mrow></mml:msubsup><mml:mo>></mml:mo><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mtext>c</mml:mtext></mml:mrow></mml:msub></mml:math> , defining a crescent of parapairing above T c ( p ) which extends across the entire superconducting phase diagram and which is quite distinct from pseudogap phenomenology. The data are consistent with d -wave pairing and the BCS ratios are extracted, revealing canonical near-weak-coupling behavior across the over-doped region with a sudden suppression occurring at p ≈ 0.19 when the pseudogap sets in." @default.
• W4309461503 created "2022-11-28" @default.
• W4309461503 creator A5021819462 @default.
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• W4309461503 date "2022-11-16" @default.
• W4309461503 modified "2023-09-30" @default.
• W4309461503 title "Thermodynamics of the pseudogap in cuprates" @default.
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• W4309461503 doi "https://doi.org/10.3389/fphy.2022.1030616" @default.
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