Superfluid Density in a Highly Underdoped YBa2Cu3O6+y Superconductor
D. M. Broun, W. A. Huttema, P. J. Turner, S. Özcan, B. Morgan, Ruixing Liang, W. N. Hardy, D. A. Bonn
DOI 10.1103/PhysRevLett.99.237003 · Physical Review Letters
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Abstract
The superfluid density ρs(T)≡1/λ2(T) has been measured at 2.64 GHz in highly underdoped YBa2Cu3O6+y, at 37 dopings with Tc between 3 and 17 K. Within limits set by the transition width ΔTc≈0.4 K, ρs(T) shows no evidence of critical fluctuations as T→Tc, with a mean-field-like transition and no indication of vortex unbinding. Instead, we propose that ρs displays the behavior expected for a quantum phase transition in the (3+1)-dimensional XY universality class, with ρs0∝(p−pc), Tc∝(p−pc)1/2, and ρs(T)∝(Tc−T)1 as T→Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
| YBa2Cu3O6+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | 3 GPa | unknown |
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