Spin polarization in photoemission from the cuprate superconductor Bi2Sr2CaCu2O8+δ

Mauro Fanciulli; Stefan Muff; Andrew P. Weber; J. Hugo Dil

doi:10.1103/PhysRevB.95.245125

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Spin polarization in photoemission from the cuprate superconductor Bi2Sr2CaCu2O8+δ

Mauro Fanciulli, Stefan Muff, Andrew P. Weber, J. Hugo Dil

DOI 10.1103/PhysRevB.95.245125 · Physical Review B

T1

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Abstract

Photoelectrons produced from the excitation of spin-degenerate states in solids can have a sizable spin polarization, which is related to the phase of interfering channels in the photoemission matrix elements. Such spin polarization can be measured by spin-resolved photoemission spectroscopy to gain information about the transitions and the Wigner time delay of the process. Incorporating strongly correlated electron systems into this paradigm could yield a novel means of extracting phase information crucial to understanding the mechanism of their emergent behavior. In this work, we present, as a case study, experimental measurements of the cuprate superconductor Bi2Sr2CaCu2O8+δ by spin-resolved photoemission while maintaining full angular and energy resolution. A spin polarization of at least 10% is observed, which is related to the phase of the photoelectron wave function.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	95	Pressure not reported	unknown
Bi2Sr2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure not reported	unknown