naa a22 4500 510815758 CHVBK 20180411083506.0 cr unu---uuuuu 180411e20131101xx s 000 0 eng 10.1134/S0031918X13110070 doi (NATIONALLICENCE)springer-10.1134/S0031918X13110070 Anisotropy of optical properties of hexagonal R MnO3 Manganites ( R [Elektronische Daten] Ho, Er, Tm, Yb) [A. Makhnev, L. Nomerovannaya] The evolution of real and imaginary parts of the complex permittivity of hexagonal single crystals of RMnO3 manganites (R = Ho, Er, Tm, Yb) differing in the radius of rare-earth ion r R has been studied using spectroscopic ellipsometry in the range of 0.5-5.0 eV at room temperature. Spectra of dielectric functions show a strong polarization dependence. The optical-absorption edge for polarization E ⊥ c is determined by the intense narrow peak at 1.6 eV, whereas for polarization E ‖ c, the peak is shifted toward high energies by 0.15-0.20 eV and its intensity is suppressed greatly. It has been shown that, when r R decreases, the energy position of the intense peak at 1.6 eV in the spectrum of the imaginary part of the dielectric function for polarization E ⊥ c shifts toward low energies by no more than 0.1 eV, which reflects changes in the local surroundings of the Mn3+ ion. For the both polarizations, a broad absorption band with the center at 2.4 eV has been revealed; the band was detected earlier in the antiferromagnetic phase in nonlinear spectra upon the optical generation of the second harmonic. Spectra of permittivity have been analyzed within available concepts on the electronic structure of hexagonal RMnO3 compounds and have been compared with corresponding spectra of previously studied orthorhombic RMnO3 compounds. Pleiades Publishing, Ltd., 2013 hexagonal manganites nationallicence anisotropy of optical properties nationallicence ellipsometry nationallicence Makhnev A. Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, 620990, Ekaterinburg, Russia aut Nomerovannaya L. Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, 620990, Ekaterinburg, Russia aut The Physics of Metals and Metallography Springer US; http://www.springer-ny.com 114/11(2013-11-01), 910-917 0031-918X 114:11<910 2013 114 11508 https://doi.org/10.1134/S0031918X13110070 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0031918X13110070 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Makhnev A. Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, 620990, Ekaterinburg, Russia aut NATIONALLICENCE 700 1- Nomerovannaya L. Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, 620990, Ekaterinburg, Russia aut NATIONALLICENCE 773 0- The Physics of Metals and Metallography Springer US; http://www.springer-ny.com 114/11(2013-11-01), 910-917 0031-918X 114:11<910 2013 114 11508 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer