Electronic specific heat of YBa2Cu3O6+x from 1.8 to 300 K

Loram, J. W.; Mirza, K. A.; Cooper, J. R.; Liang, W. Y.; Wade, J.M.

doi:10.1007/bf00730405

Cited by 276 publications

(332 citation statements)

References 16 publications

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“…In Fig.4.14a we show the speci c heat of the compound YBa 2 Cu 3 O 6.57 , measured in [150]. The sharp feature indicates the normal to super uid phase transition at T = T c = 57 K. In the wide temperature range T c < T T * = 150 K, the speci c heat is not linear with temperature, indicating the non-applicability of Fermi liquid theory.…”

Section: The Pseudogap Phasementioning

confidence: 99%

Thermodynamics of Ultracold Fermi Gases

Nascimbène

Navon

Chevy

et al. 2010

Latin America Optics and Photonics Conference

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Section: The Pseudogap Phasementioning

confidence: 99%

Thermodynamics of Ultracold Fermi Gases

Nascimbène

Navon

Chevy

et al. 2010

Latin America Optics and Photonics Conference

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“…4, we plot our calculation of the lattice specific heat (solid line) using the results from ARPES [25] for x = 7 together with the curves adapted for the total "raw data" experimental specific heat for x = 6.67 from Ref. [48] (diamonds) and for x = 6.70 from Ref. [25] (triangles).…”

Section: A Lattice Specific Heatmentioning

confidence: 99%

“…The total specific heat C T p is the sum of all three components: the electronic specific heat we calculated for both composite-bosons and unpaired electrons with the parameters P 0 = 501 and f = 0.0148, in addition to the lattice [25] and [48]. The contribution of the electronic component shown separately.…”

Section: A Lattice Specific Heatmentioning

confidence: 99%

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Specific heat of underdoped cuprate superconductors from a phenomenological layered Boson–Fermion model

Salas

Fortes

Solís

et al. 2016

Physica C: Superconductivity and its Applications

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We adapt the Boson-Fermion superconductivity model to include layered systems such as underdoped cuprate superconductors. These systems are represented by an infinite layered structure containing a mixture of paired and unpaired fermions. The former, which stand for the superconducting carriers, are considered as noninteracting zero spin composite-bosons with a linear energymomentum dispersion relation in the CuO2 planes where superconduction is predominant, coexisting with the unpaired fermions in a pattern of stacked slabs. The inter-slab, penetrable, infinite planes are generated by a Dirac comb potential, while paired and unpaired electrons (or holes) are free to move parallel to the planes. Composite-bosons condense at a critical temperature at which they exhibit a jump in their specific heat. These two values are assumed to be equal to the superconducting critical temperature Tc and the specific heat jump reported for YBa2Cu3O6.80 to fix our model parameters namely, the plane impenetrability and the fraction of superconducting charge carriers. We then calculate the isochoric and isobaric electronic specific heats for temperatures lower than Tc of both, the composite-bosons and the unpaired fermions, which matches recent experimental curves. From the latter, we extract the linear coefficient (γn) at Tc, as well as the quadratic (αT 2 ) term for low temperatures. We also calculate the lattice specific heat from the ARPES phonon spectrum, and add it to the electronic part, reproducing the experimental total specific heat at and below Tc within a 5% error range, from which the cubic (ßT 3 ) term for low temperatures is obtained. In addition, we show that this model reproduces the cuprates mass anisotropies.

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“…Clearly, atomic-layer-by-layer synthesis capability has been critical for this task. Zn was chosen because it is known to suppress T c and the superfluid carrier density n s significantly, without affecting the carrier density [15][16][17][18] The results obtained in the experiment with M-I bilayers are summarized in figure 6: T c remained unchanged at approximately 30 K in almost all the films. The only exceptions were those in which Zn d-doping was carried out in the second CuO 2 plane counting from the nominal geometric M-I interface towards the surface of the sample (N = 2), in which case a drop to T c ≈ 18 K was observed.…”

Section: Interface Superconductivitymentioning

confidence: 99%

Insights from the study of high-temperature interface superconductivity

Pereiro

Bollinger

Логвенов

et al. 2012

Phil. Trans. R. Soc. A.

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A brief overview is given of the studies of high-temperature interface superconductivity based on atomic-layer-by-layer molecular beam epitaxy (ALL-MBE). A number of difficult materials science and physics questions have been tackled, frequently at the expense of some technical tour de force, and sometimes even by introducing new techniques. ALL-MBE is especially suitable to address questions related to surface and interface physics. Using this technique, it has been demonstrated that high-temperature superconductivity can occur in a single copper oxide layer-the thinnest superconductor known. It has been shown that interface superconductivity in cuprates is a genuine electronic effect-it arises from charge transfer (electron depletion and accumulation) across the interface driven by the difference in chemical potentials rather than from cation diffusion and mixing. We have also understood the nature of the superconductorinsulator phase transition as a function of doping. However, a few important questions, such as the mechanism of interfacial enhancement of the critical temperature, are still outstanding.

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Electronic specific heat of YBa2Cu3O6+x from 1.8 to 300 K

Cited by 276 publications

References 16 publications

Thermodynamics of Ultracold Fermi Gases

Thermodynamics of Ultracold Fermi Gases

Specific heat of underdoped cuprate superconductors from a phenomenological layered Boson–Fermion model

Insights from the study of high-temperature interface superconductivity

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