Journal
PHYSICAL REVIEW B
Volume 101, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.101.020506
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Funding
- French state funds by the Agence Nationale de la Recherche (ANR) within the Investissements d'Avenir programme [ANR-11-IDEX-0004-02]
- LLB/SOLEIL PhD fellowship program
- Tokyo Tech World Research Hub Initiative (WRHI) Program of Institute of Innovative Research
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We measure the dispersion of the Cu-O bond-stretching phonon mode in the high-temperature superconducting parent compound Ca2CuO2Cl2. Our density functional theory calculations predict a cosine-shaped bending of the dispersion along both the (xi 00) and (xi xi 0) directions, while comparison with previous results on Ca1.84CuO2Cl2 show it only along (xi 00), suggesting an anisotropic effect which is not reproduced in calculation. Comparison with isostructural La2-xSrxCuO4 and literature suggests that these calculations reproduce well the dispersion in the overdoped regime.
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