by Huotari, S., Simonelli, L., Sahle, C. J., Sala, M. Moretti and Verbeni, R. and Monaco, G.
Abstract:
We report a study on the temperature dependence of charge-neutral crystal field (dd) excitations in cupric oxide, using nonresonant inelastic x-ray scattering spectroscopy. Thanks to a very high-energy resolution (Delta E = 60 meV), we observe thermal effects on the dd excitation spectrum fine structure between temperatures of 10-320 K. The spectra broaden considerably with increasing temperature, consistently with an enhancement of the coupling between crystal field excitations and the temperature-dependent continuum of states above the band gap. We discuss this and other mechanisms that may explain this temperature dependence.
Reference:
Temperature dependence of crystal field excitations in CuO (Huotari, S., Simonelli, L., Sahle, C. J., Sala, M. Moretti and Verbeni, R. and Monaco, G.), In JOURNAL OF PHYSICS-CONDENSED MATTER, IOP PUBLISHING LTD, volume 26, 2014.
Bibtex Entry:
@article{ ISI:000333798500008, Author = {Huotari, S. and Simonelli, L. and Sahle, C. J. and Sala, M. Moretti and Verbeni, R. and Monaco, G.}, Title = {{Temperature dependence of crystal field excitations in CuO}}, Journal = {{JOURNAL OF PHYSICS-CONDENSED MATTER}}, Year = {{2014}}, Volume = {{26}}, Number = {{16}}, Month = {{APR 23}}, Abstract = {{We report a study on the temperature dependence of charge-neutral crystal field (dd) excitations in cupric oxide, using nonresonant inelastic x-ray scattering spectroscopy. Thanks to a very high-energy resolution (Delta E = 60 meV), we observe thermal effects on the dd excitation spectrum fine structure between temperatures of 10-320 K. The spectra broaden considerably with increasing temperature, consistently with an enhancement of the coupling between crystal field excitations and the temperature-dependent continuum of states above the band gap. We discuss this and other mechanisms that may explain this temperature dependence.}}, Publisher = {{IOP PUBLISHING LTD}}, Address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}}, Type = {{Article}}, Language = {{English}}, Affiliation = {{Huotari, S (Corresponding Author), Univ Helsinki, Dept Phys, POB 64, FI-00014 Helsinki, Finland. Huotari, S.; Sahle, C. J., Univ Helsinki, Dept Phys, FI-00014 Helsinki, Finland. Huotari, S.; Simonelli, L.; Sala, M. Moretti; Verbeni, R.; Monaco, G., European Synchrotron Radiat Facil, F-38043 Grenoble, France. Monaco, G., Univ Trento, Dept Phys, I-38123 Povo, Italy.}}, DOI = {{10.1088/0953-8984/26/16/165501}}, Article-Number = {{165501}}, ISSN = {{0953-8984}}, EISSN = {{1361-648X}}, Keywords = {{crystal field excitations; inelastic x-ray scattering; CuO}}, Keywords-Plus = {{X-RAY-SCATTERING; OXIDE}}, Research-Areas = {{Physics}}, Web-of-Science-Categories = {{Physics, Condensed Matter}}, ResearcherID-Numbers = {{Sahle, Christoph/T-1326-2017 Sahle, Christoph/P-6715-2019 Sala, Marco Moretti/H-1034-2014 Monaco, Giulio/AAW-4387-2020 Simonelli, Laura/I-1963-2015 Moretti, Marco/AAF-9255-2019 }}, ORCID-Numbers = {{Sahle, Christoph/0000-0001-8645-3163 Sahle, Christoph/0000-0001-8645-3163 Sala, Marco Moretti/0000-0002-9744-9976 Monaco, Giulio/0000-0003-2497-6422 Moretti, Marco/0000-0002-9744-9976 Huotari, Simo/0000-0003-4506-8722}}, Funding-Acknowledgement = {{Academy of FinlandAcademy of Finland {[}1256211, 1127462, 1259526]; University of Helsinki Research Funds {[}490076]}}, Funding-Text = {{Beamtime was granted by the European Synchrotron Radiation Facility. Funding was provided by the Academy of Finland (grants 1256211, 1127462 and 1259526) and University of Helsinki Research Funds (grant 490076). The chemical purity and stoichiometry of the CuO crystal was confirmed by standardless energy dispersive spectrometry using a Jeol JXA-8600 electron probe microanalyzer at the Department of Geosciences and Geography, University of Helsinki. We are grateful to C Henriquet, M-C Lagier and the whole beamline ID16 team and support groups for expert assistance, advice, and encouragement in the experiment. We would like to thank M W Haverkort, M Hakala, M Gatti and C Rodl for fruitful discussions, as well as C Sternemann and W Schulke for lending the sample.}}, Number-of-Cited-References = {{57}}, Times-Cited = {{11}}, Usage-Count-Last-180-days = {{0}}, Usage-Count-Since-2013 = {{34}}, Journal-ISO = {{J. Phys.-Condes. Matter}}, Doc-Delivery-Number = {{AE2JG}}, Unique-ID = {{ISI:000333798500008}}, OA = {{Green Published}}, DA = {{2020-12-22}}, }
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