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Locating the pseudogap closing point in cuprate superconductors: Absence of entrant or reentrant behavior

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journal contribution
posted on 10.05.2022, 05:13 by Jeffery TallonJeffery Tallon, James StoreyJames Storey, JR Cooper, JW Loram
Many current descriptions of the pseudogap in underdoped cuprates envision a doping-dependent transition line T∗(p) which descends monotonically toward zero just beyond optimal doping. There is much debate as to the location of the terminal point p∗ where T∗(p) vanishes, whether or not there is a phase transition at T∗ and exactly how T∗(p) behaves below Tc within the superconducting dome. One perspective sees T∗(p) cutting the dome and continuing to descend monotonically to zero at p∗≈0.19 holes/Cu - referred to here as entrant behavior. Another perspective derived from photoemission studies is that T∗(p) intersects the dome near p≈0.23 holes/Cu then turns back below Tc, falling to zero again around p∗≈0.19 - referred to here as reentrant behavior. By examining field-dependent thermodynamic data for Bi2Sr2CaCu2O8+δ we show that neither entrant nor reentrant behavior is supported. Rather, p∗ sharply delimits the pseudogap regime: For p<0.19 the pseudogap is always present, independent of T. Similar results are found for Y0.8Ca0.2Ba2Cu3O7-δ. For both materials, T∗(p) is not a temperature but a crossover scale, ≈E∗(p)/2kB, reflecting instead the underlying pseudogap energy E∗(p) which vanishes as p→p∗≈0.19.

History

Preferred citation

Tallon, J. L., Storey, J. G., Cooper, J. R. & Loram, J. W. (2020). Locating the pseudogap closing point in cuprate superconductors: Absence of entrant or reentrant behavior. Physical Review B, 101(17), 174512-. https://doi.org/10.1103/PhysRevB.101.174512

Journal title

Physical Review B

Volume

101

Issue

17

Publication date

01/05/2020

Pagination

174512

Publisher

American Physical Society (APS)

Publication status

Published

Online publication date

21/05/2020

ISSN

2469-9950

eISSN

2469-9969

Article number

174512

Language

en