Photoinduced expansion of cuprate superconductors: Evidence of strong electron-lattice coupling

Z. Radović; N. Božović; I. Božović

doi:10.1103/PhysRevB.77.092508

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Photoinduced expansion of cuprate superconductors: Evidence of strong electron-lattice coupling

Z. Radović, N. Božović, I. Božović

DOI 10.1103/PhysRevB.77.092508 · Physical Review B

T1

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Abstract

Intense light pulses cause “colossal” (larger than thermal) expansion in cuprate films. We show that a simple ionic model accounts for both the static expansion caused by chemical doping and the photoinduced dynamic expansion. Because of the (static or intermittent) reduction of ionic charges, the ions feel lesser electrostatic attraction and move apart. The displacements can be large since the Madelung energy can change by more than 1eV/atom. From this ionic picture, one would expect significant structural reconstruction at heterointerfaces and photoinduced shifts in Raman frequencies.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown