Large Isotope Effect on the Pseudogap in the High-Temperature Superconductor HoBa2Cu4O8
D. Rubio Temprano, J. Mesot, S. Janssen, K. Conder, A. Furrer, H. Mutka, K. A. Müller
DOI 10.1103/PhysRevLett.84.1990 · Physical Review Letters
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Abstract
The oxygen isotope effect on the relaxation rate of crystal-field excitations in the slightly underdoped high-temperature superconductor HoBa2Cu4O8 has been investigated by means of inelastic neutron scattering. For the 16O compound there is clear evidence for the opening of an electronic gap in the normal state at T*≈170K far above Tc=79K. Upon oxygen isotope substitution ( 16O vs 18O) Tc decreases marginally to 78.5 K, whereas T* is shifted to about 220 K. This huge isotope shift observed for T* which is absent in NMR and NQR experiments suggests that the mechanism leading to an isotope effect on the pseudogap has to involve a time scale in the range 10−8≫τ>10−13s.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HoBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 79 | Pressure not reported | unknown |
| HoBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78.5 | Pressure not reported | unknown |
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