Theoretical study of the structural dependence of nuclear quadrupole frequencies in high-Tc superconductors

M. E. Garcia; K. H. Bennemann

doi:10.1103/PhysRevB.40.8809

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Theoretical study of the structural dependence of nuclear quadrupole frequencies in high-Tc superconductors

M. E. Garcia, K. H. Bennemann

DOI 10.1103/PhysRevB.40.8809 · Physical Review B

T1

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Abstract

The remarkable difference between the nuclear quadrupole frequencies νQ of Cu(1) and Cu(2) in YBa2Cu3O6 and YBa2Cu3O7 is analyzed. We calculate the ionic contribution to the electric field gradients and estimate, by using experimental results for Cu2O and La2CuO4, the contribution of the d valence electrons. Thus, we determine νQ1, νQ2, and the asymmetry parameter η for YBa2Cu3O6 and YBa2Cu3O7. The number of holes in the Cu-O planes and chains is found to be important for the different behavior of νQ1 and νQ2.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
(La0.925Sr0.075)2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown