Oxygen and copper isotope effects on the pseudogap in the high-temperature superconductor La1.81Ho0.04Sr0.15CuO4 studied by neutron crystal-field spectroscopy
D. Rubio Temprano, K. Conder, A. Furrer, H. Mutka, V. Trounov, K. A. Müller
DOI 10.1103/PhysRevB.66.184506 · Physical Review B
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Abstract
The oxygen and copper isotope effects on the relaxation rate of crystal-field excitations in the optimally doped high-temperature superconductor La1.81Ho0.04Sr0.15CuO4 have been investigated by means of inelastic neutron scattering. For the 16O compound there is clear evidence for the opening of an electronic pseudogap in the normal state at T*≈60K, far above Tc≈32K. Upon substituting 16O by 18O, T* is shifted to about 70 K. On the other hand, no shift is found for the copper isotope substitution, i.e., T*(63Cu)≈T*(65Cu)≈60K. These results, together with the large oxygen and copper isotope effects on T* for HoBa2Cu4O8, give evidence that the pseudogap formation in the single-layer LSCO and bilayer YBCO type compounds is governed by an additional local mode in the latter.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.81Ho0.04Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| HoBa2Cu4O8 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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