Field-dependent specific heat of the canonical underdoped cuprate superconductor YBa2Cu4O8 Tallon-2020-Scientific_Reports.pdf (1.68 MB)
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Field-dependent specific heat of the canonical underdoped cuprate superconductor YBa 2Cu 4O 8

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posted on 10.05.2022, 05:12 by Jeffery TallonJeffery Tallon, JW Loram
The cuprate superconductor YBa 2Cu 4O 8, 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, T∗, which rises with decreasing hole concentration, p. Here, we report extensive field-dependent electronic specific heat studies on YBa 2Cu 4O 8 up to an unprecedented 400 K and show unequivocally that the pseudogap never closes, remaining open to at least 400 K where T∗ 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.

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Preferred citation

Tallon, J. L. & Loram, J. W. (2020). Field-dependent specific heat of the canonical underdoped cuprate superconductor YBa 2Cu 4O 8. Scientific Reports, 10(1), 22288-. https://doi.org/10.1038/s41598-020-79017-3

Journal title

Scientific Reports

Volume

10

Issue

1

Publication date

01/12/2020

Pagination

22288

Publisher

Springer Science and Business Media LLC

Publication status

Published

Online publication date

18/12/2020

ISSN

2045-2322

eISSN

2045-2322

Article number

22288

Language

en

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