000171479 001__ 171479
000171479 005__ 20181203022534.0
000171479 0247_ $$2doi$$a10.1088/1367-2630/13/4/043026
000171479 022__ $$a1367-2630
000171479 02470 $$2ISI$$a000289994100003
000171479 037__ $$aARTICLE
000171479 245__ $$aEnergy and symmetry of dd excitations in undoped layered cuprates measured by Cu L-3 resonant inelastic x-ray scattering
000171479 260__ $$bInstitute of Physics (IoP) and Deutsche Physikalische Gesellschaft$$c2011
000171479 269__ $$a2011
000171479 336__ $$aJournal Articles
000171479 520__ $$aWe measured the high-resolution Cu L-3 edge resonant inelastic x-ray scattering (RIXS) of undoped cuprates La2CuO4, Sr2CuO2Cl2, CaCuO2 and NdBa2Cu3O6. The dominant spectral features were assigned to dd excitations and we extensively studied their polarization and scattering geometry dependence. In a pure ionic picture, we calculated the theoretical cross sections for those excitations and used these to fit the experimental data with excellent agreement. By doing so, we were able to determine the energy and symmetry of Cu-3d states for the four systems with unprecedented accuracy and confidence. The values of the effective parameters could be obtained for the single-ion crystal field model but not for a simple two-dimensional cluster model. The firm experimental assessment of dd excitation energies carries important consequences for the physics of high-T-c superconductors. On the one hand, we found that the minimum energy of orbital excitation is always >= 1.4 eV, i.e. well above the mid-infrared spectral range, which leaves to magnetic excitations (up to 300 meV) a major role in Cooper pairing in cuprates. On the other hand, it has become possible to study quantitatively the effective influence of dd excitations on the superconducting gap in cuprates.
000171479 6531_ $$aLamellar Copper Oxides
000171479 6531_ $$aOptical-Absorption
000171479 6531_ $$aEmission-Spectroscopy
000171479 6531_ $$aRaman-Scattering
000171479 6531_ $$aSuperconductors
000171479 6531_ $$aSr2Cuo2Cl2
000171479 6531_ $$aAntiferromagnetism
000171479 6531_ $$aResolution
000171479 6531_ $$aPhotoemission
000171479 6531_ $$aTemperature
000171479 700__ $$aMoretti Sala, M.
000171479 700__ $$aBisogni, V.
000171479 700__ $$aAruta, C.
000171479 700__ $$aBalestrino, G.
000171479 700__ $$aBerger, H.
000171479 700__ $$aBrookes, N. B.
000171479 700__ $$ade Luca, G. M.
000171479 700__ $$aDi Castro, D.
000171479 700__ $$aGrioni, M.
000171479 700__ $$aGuarise, M.
000171479 700__ $$aMedaglia, P. G.
000171479 700__ $$aGranozio, F. Miletto
000171479 700__ $$aMinola, M.
000171479 700__ $$aPerna, P.
000171479 700__ $$aRadovic, M.
000171479 700__ $$aSalluzzo, M.
000171479 700__ $$aSchmitt, T.
000171479 700__ $$aZhou, K. J.
000171479 700__ $$aBraicovich, L.
000171479 700__ $$aGhiringhelli, G.
000171479 773__ $$j13$$q-$$tNew Journal Of Physics
000171479 909C0 $$0252369$$pSB$$xU10077
000171479 909CO $$ooai:infoscience.tind.io:171479$$pSB$$particle
000171479 917Z8 $$x105753
000171479 937__ $$aEPFL-ARTICLE-171479
000171479 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000171479 980__ $$aARTICLE