Field-dependent specific heat of the canonical underdoped cuprate superconductor YBaCuO
arXiv:2012.10617 · doi:10.1038/s41598-020-79017-3
Abstract
The cuprate superconductor YBaCuO, in comparison with most other cuprates, has a stable stoichiometry, is largely free of defects and may be regarded as the canonical underdoped cuprate, displaying marked pseudogap behaviour and an associated distinct weakening of superconducting properties. This cuprate `pseudogap' manifests as a partial gap in the electronic density of states at the Fermi level and is observed in most spectroscopic properties. After several decades of intensive study it is widely believed that the pseudogap closes, mean-field like, near a characteristic temperature, , which rises with decreasing hole concentration, . Here, we report extensive field-dependent electronic specific heat studies on YBaCuO up to an unprecedented 400 K and show unequivocally that the pseudogap never closes, remaining open to at least 400 K where is typically presumed to be about 150 K. We show from the NMR Knight shift and the electronic entropy that the Wilson ratio is numerically consistent with a weakly-interacting Fermion system for the near-nodal states. And, from the field-dependent specific heat, we characterise the impact of fluctuations and impurity scattering on the thermodynamic properties.
arXiv comment12 pages, 8 figures
References in corpus (24)
- The pseudogap in high-temperature superconductors: an experimental survey
- Imaging the Effects of Individual Zinc Impurity Atoms on Superconductivity in Bi2Sr2CaCu2O8+delta
- The doping dependence of T* - what is the real high-Tc phase diagram?
- The pseudogap: friend or foe of high Tc?
- Magnetic order in the pseudogap phase of high- superconductors
- Polar Kerr Effect Measurements of YBa2Cu3O6+x: Evidence for Broken Symmetry Near the Pseudogap Temperature
- From a single-band metal to a high-temperature superconductor via two thermal phase transitions (Supporting Material)
- From a single-band metal to a high-temperature superconductor via two thermal phase transitions
- Phase competition in trisected superconducting dome
- Thermodynamic evidence for nematic phase transition at the onset of pseudogap in YBaCuO
- Particle-Hole Symmetry Breaking in the Pseudogap State of Bi2201
- Bounding the pseudogap with a line of phase transitions in YBCO cuprate superconductors
- Point nodes persisting far beyond Tc in Bi2212
- Quantum oscillations from nodal bilayer magnetic breakdown in the underdoped high temperature superconductor YBa2Cu3O6+x
- Direct Observation and Anisotropy of the Contribution of Gap nodes in the Low Temperature Specific Heat of YBa_2Cu_3O_7
- Weak coupling d-wave BCS superconductivity and unpaired electrons in overdoped La_{2-x}Sr_{x}CuO_{4} single crystals
- Spectroscopic distinction between the normal state pseudogap and the superconducting gap of cuprate high T_{c} superconductors
- Hall effect and Fermi surface reconstruction via electron pockets in the high- cuprates
- Observation of small Fermi pockets protected by clean CuO2 sheets of a high-Tc superconductor
- Coexistence of the superconducting energy gap and pseudogap above and below the transition temperature of superconducting cuprates
- Locating the pseudogap closing point in cuprate superconductors: absence of entrant or reentrant behavior
- Temperature independent cuprate pseudogap from planar oxygen NMR
- Incoherent superconductivity well above in high- cuprates - harmonizing the spectroscopic and thermodynamic data
- Temperature and field dependence of the intrinsic tunnelling structure in overdoped BiSrCaCuO