NMR evidence for common superconducting and pseudogap phase diagrams of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} and La{sub 2{minus}{ital x}}Sr{sub x}CaCu{sub 2}O{sub 6}

Journal Article · Sun Sep 01 00:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.R6909· OSTI ID:383208

Williams, G V; Tallon, J L ^[1]; Michalak, R; Dupree, R ^[2]

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1. New Zealand Institute for Industrial Research and Development, P.O. Box 31310, Lower Hutt (New Zealand)
2. Department of Physics, University of Warwick, Coventry CV47AL (United Kingdom)

We report ac susceptibility and {sup 17}O nuclear-magnetic-resonance (NMR) measurements on the double-CuO{sub 2}-layer La{sub 2{minus}{ital x}}Sr{sub {ital x}}CaCu{sub 2}O{sub 6} high-temperature superconducting cuprate (HTSC) with a {ital T}{sub {ital c},max} of 60 K. A comparison is made with {sup 89}Y NMR measurements on YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, which has a higher {ital T}{sub {ital c},max} of 93 K and Y{sub 0.8}Ca{sub 0.2}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} with a slightly lower {ital T}{sub {ital c},max} of 87 K. We find that the hole concentration dependence of the normal-state gap and of {ital T}{sub {ital c}} both scale with {ital T}{sub {ital c},max}, implying a universal scaled phase diagram for these two superconductors, and, by implication, for the wider class of HTSC. This suggests that the normal-state gap and the pairing mechanism may have a common origin. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 383208
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CALCIUM OXIDES
COPPER OXIDES
ELECTRONIC STRUCTURE
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
LANTHANUM OXIDES
MAGNETIC SUSCEPTIBILITY
NMR SPECTRA
PHASE DIAGRAMS
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TRANSITION TEMPERATURE
YTTRIUM OXIDES