Specific-Heat of YBa2Cu3Oxup to 400 K: High-Resolution Adiabatic Measurements andAb-initioLDA Phonon Calculations

Meingast, C.; Inaba, Akira; Heid, R.; Pankoke, V.; Bohnen, K.‐P.; Reichardt, W.; Wolf, Thomas

doi:10.1143/jpsj.78.074706

Cited by 7 publications

(17 citation statements)

References 19 publications

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“…The model parameters are unambiguously determined by the phenomenological properties of YBa 2 Cu 3 O 6.80 , namely the experimental T c and the magnitude of jump ∆C p /T c , from which the observed T 2 behavior at low temperatures of C pes and the linear dependence on T of C pen are directly obtained. Furthermore, we combine C pes + C pen to show that the total electronic specific heat coincides with the experimental results [25]. Our electronic specific heat constants, γ n (T c ) and α are found to be of the same order of magnitude as the experimental values [34,35].…”

Section: Introductionsupporting

confidence: 64%

“…5 of Ref. [25], where the authors present exclusively the electronic part after successfully extracting the phonon contribution.…”

Section: B Normal Electronic Specific Heatmentioning

confidence: 99%

“…Specifically, we take the experimental results for the PDOS and introduce it in the theoretical expressions given above. We analyze the results of three different experiments: two from INS [36,37], while the third one is based on a more recent ARPES technique [25].…”

Section: A Lattice Specific Heatmentioning

confidence: 99%

“…[48] (diamonds) and for x = 6.70 from Ref. [25] (triangles). We find that our calculated C l (solid line) using the ARPES density of state is close to the experimental total specific heat C T p , however, there is a significant difference using INS data (around the 30 %).…”

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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Section: Introductionsupporting

confidence: 64%

“…5 of Ref. [25], where the authors present exclusively the electronic part after successfully extracting the phonon contribution.…”

Section: B Normal Electronic Specific Heatmentioning

confidence: 99%

Section: A Lattice Specific Heatmentioning

confidence: 99%

Section: A Lattice Specific Heatmentioning

confidence: 99%

Section: A Lattice Specific Heatmentioning

confidence: 99%

See 3 more Smart Citations

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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Theoretical investigation of a CDDW Hamiltonian for YBa₂Cu₃O_7−δ

Goswami

2010

Physica Status Solidi (b)

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(YBCO). We consider the commensurate density wave order which doubles the unit cell of the real space lattice and show that the transition to CDDW state gives rise to the occurrence of jump discontinuities in the entropy density difference between the CDDW state and the normal metallic state at eight points (''Hot spots'') on the boundary of the reduced Brillouin zone. The chirality induced anomalous Nernst signal is shown to arise mainly from the points, close to these ''Hot spots,'' and located on the boundary of the hole pockets as reported by the previous workers. Finally, we discuss the possibility of quantum oscillations in the specific heat for the system under consideration in the presence of a changing magnetic field.

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Pseudogap inYBa2Cu3O6+δi

et al. 2014

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We discuss a recent resonant ultrasound spectroscopy (RUS) study of YBa2Cu3O 6+δ , which infers a line of phase transitions bounding the pseudogap phase and argue that this scenario is not supported by thermodynamic evidence. We show that the anomalies in RUS, heat capacity and thermal expansion at the superconducting transition temperatures agree well. But there are large discrepancies between RUS and thermodynamic measurements at T * where the pseudogap phase transitions are purported to occur. Moreover, the frequency and temperature dependence of the RUS data for the crystal with δ = 0.98, interpreted in terms of critical slowing down near an electronic phase transition, is five orders of magnitude smaller than what is expected. For this crystal the RUS data near T * are more consistent with non-equilibrium effects such as oxygen relaxation.

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Specific-Heat of YBa₂Cu₃O_xup to 400 K: High-Resolution Adiabatic Measurements andAb-initioLDA Phonon Calculations

Cited by 7 publications

References 19 publications

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

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

Theoretical investigation of a CDDW Hamiltonian for YBa₂Cu₃O_7−δ

Pseudogap inYBa2Cu3O6+δi

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Specific-Heat of YBa2Cu3Oxup to 400 K: High-Resolution Adiabatic Measurements andAb-initioLDA Phonon Calculations

Cited by 7 publications

References 19 publications

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

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

Theoretical investigation of a CDDW Hamiltonian for YBa2Cu3O7−δ

Pseudogap inYBa2Cu3O6+δi

Contact Info

Product

Resources

About

Specific-Heat of YBa₂Cu₃O_xup to 400 K: High-Resolution Adiabatic Measurements andAb-initioLDA Phonon Calculations

Theoretical investigation of a CDDW Hamiltonian for YBa₂Cu₃O_7−δ