First-order-type effects in YBa2Cu3O6+x at the onset of superconductivity
L. Tassini, W. Prestel, A. Erb, M. Lambacher, R. Hackl
DOI 10.1103/PhysRevB.78.020511 · Physical Review B
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Abstract
We present results of Raman-scattering experiments on tetragonal (Y1−yCay)Ba2Cu3O6+x for doping levels p(x,y) between 0 and 0.07 holes/CuO2. Below the onset of superconductivity at psc1≈0.06, we find evidence of a diagonal superstructure. At psc1, lattice and electron dynamics change discontinuously with the charge and spin properties being renormalized at all energy scales. The results indicate that charge ordering is intimately related to the transition at psc1 and that the maximal transition temperature to superconductivity at optimal doping Tcmax depends on the type of ordering at p>psc1.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Y1-yCay)Ba2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | unknown |
| YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
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