Optical and thermodynamic properties of the high-temperature superconductor HgBa2CuO4+δ
E. van Heumen, R. Lortz, A. B. Kuzmenko, F. Carbone, D. van der Marel, X. Zhao, G. Yu, Y. Cho, N. Barisic, M. Greven, C. C. Homes, S. V. Dordevic
DOI 10.1103/PhysRevB.75.054522 · Physical Review B
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Abstract
In- and out-of-plane optical spectra and specific heat measurements for the single layer cuprate superconductor HgBa2CuO4+δ (Hg-1201) at optimal doping (Tc=97K) are presented. Both the in-plane and out-of-plane superfluid density agree well with a recently proposed scaling relation ρs∝σdcTc. It is shown that there is a superconductivity induced increase of the in-plane low frequency spectral weight which follows the trend found in underdoped and optimally doped Bi2Sr2CaCu2O8+δ (Bi-2212) and optimally doped Bi2Sr2Ca2Cu3O10+δ (Bi-2223). We observe an increase of optical spectral weight which corresponds to a change in kinetic energy ΔW≈0.5meV∕Cu which is more than enough to explain the condensation energy. The specific heat anomaly is 10 times smaller than in YBa2Cu3O6+δ (YBCO) and 3 times smaller than in Bi-2212. The shape of the anomaly is similar to the one observed in YBCO showing that the superconducting transition is governed by thermal fluctuations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 97 | Pressure not reported | unknown |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 97 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2Ca2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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