Ultrafast charge dynamics in photoexcited Nd2CuO4 and La2CuO4 cuprate compounds investigated by femtosecond absorption spectroscopy
H. Okamoto, T. Miyagoe, K. Kobayashi, H. Uemura, H. Nishioka, H. Matsuzaki, A. Sawa, Y. Tokura
DOI 10.1103/PhysRevB.82.060513 · Physical Review B
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Abstract
Charge and lattice dynamics caused by photocarrier doping of the undoped cuprates Nd2CuO4 and La2CuO4 were studied by femtosecond absorption spectroscopy. In both compounds, a metallic state is formed just after photoexcitation and decays within ∼200 fs. Photogenerated electrons and holes are subsequently localized due to charge-spin coupling, producing midgap absorptions at different energies. Charge-phonon coupling also occurs in both compounds. This is more significant for La2CuO4 than for Nd2CuO4, and leads to higher midgap absorption energies, and slower recombination of polaronic carriers. The role of apical oxygen atoms in charge-phonon coupling in La2CuO4 is also discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nd1.99Ce0.01CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La1.98Sr0.02CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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