Positron annihilation in the high-Tc superconductors

Bulbul Chakraborty

doi:10.1103/PhysRevB.39.215

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Positron annihilation in the high-Tc superconductors

Bulbul Chakraborty

DOI 10.1103/PhysRevB.39.215 · Physical Review B

T1

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Abstract

A model for positron annihilation in the high-Tc oxides is constructed based on the strongly correlated nature of the electrons in these systems. It is shown that the change in positron lifetime as a function of temperature in superconducting, nearly defect-free YBa2Cu3O7 and La1.85Sr0.15CuO4 can be understood on the basis of this model assuming that real hole-pair formation takes place in the superfluid state. The observed positron-lifetime changes in YBa2Cu3O7−x as a function of x is also found to be consistent with this model.

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
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown