Optical Saturation Produces Spurious Evidence for Photoinduced Superconductivity in K3C60

J. Steven Dodge; Leya Lopez; Derek G. Sahota

doi:10.1103/PhysRevLett.130.146002

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Optical Saturation Produces Spurious Evidence for Photoinduced Superconductivity in K3C60

J. Steven Dodge, Leya Lopez, Derek G. Sahota

DOI 10.1103/PhysRevLett.130.146002 · Physical Review Letters

T1

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Abstract

We discuss a systematic error in time-resolved optical conductivity measurements that becomes important at high pump intensities. We show that common optical nonlinearities can distort the photoconductivity depth profile, and by extension distort the photoconductivity spectrum. We show evidence that this distortion is present in existing measurements on K3C60, and describe how it may create the appearance of photoinduced superconductivity where none exists. Similar errors may emerge in other pump-probe spectroscopy measurements, and we discuss how to correct for them.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown