Pseudogap of the high-temperature superconductor La1.96−xSrxHo0.04CuO4 as observed by neutron crystal-field spectroscopy

Petra S. Häfliger; Andrew Podlesnyak; Kazimierz Conder; Ekaterina Pomjakushina; Albert Furrer

doi:10.1103/PhysRevB.74.184520

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Pseudogap of the high-temperature superconductor La1.96−xSrxHo0.04CuO4 as observed by neutron crystal-field spectroscopy

Petra S. Häfliger, Andrew Podlesnyak, Kazimierz Conder, Ekaterina Pomjakushina, Albert Furrer

DOI 10.1103/PhysRevB.74.184520 · Physical Review B

T1

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Abstract

We studied the isotope, pressure, and doping effects on the pseudogap temperature T* by neutron spectroscopic experiments of the relaxation rate of crystal-field excitations in La1.96−xSrxHo0.04CuO4 (x=0.11,0.15,0.20,0.25). We found clear evidence for the opening of a pseudogap at T*>Tc in the whole doping range. Furthermore, the effect of oxygen isotope substitution was found to produce an upward shift of T*, whereas the application of pressure on the optimally doped compound (x=0.15) results in a downward shift of T*. The opposite effect of oxygen isotope substitution and pressure application indicates that electron-phonon induced effects contribute to the pseudogap formation. The temperature dependence of the relaxation data is consistent with a gap function of predominantly d-wave symmetry.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.96-xSrxHo0.04CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La1.94Sr0.06CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	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
YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Hg0.82Re0.12Ba2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Ho0.1Y0.9Ba2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	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