caa a22 4500 445381221 CHVBK 20180317143018.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10948-010-0966-7 doi (NATIONALLICENCE)springer-10.1007/s10948-010-0966-7 Structure and Electric Transport in LaCo0.67Cu0.33O3 [Elektronische Daten] [M. Dlouhá, J. Hejtmánek, Z. Jirák, K. Knížek, M. Veverka, S. Vratislav] Two samples LaCo0.67Cu0.33O3−δ with different oxygen stoichiometry have been characterized by means of the X-ray and neutron diffraction, magnetic, and electric transport measurements. The compound possesses the crystal structure of the rhombohedral perovskite type and remains paramagnetic down to the liquid helium temperature. The average cobalt valence is estimated to Co3.20+ in the stoichiometric sample (δ≈0) and Co3.125+ in the oxygen deficient sample (δ≈0.04). The copper valence is estimated to Cu2.5+ in both the cases. Four different regimes of the electric transport are identified in the course of temperature in the 3-1100K range: (i) the variable range hopping at the lowest temperatures, (ii) a region of nearly constant thermopower and non-standard resistivity of power-law temperature dependence, followed by (iii) the resistivity and thermopower is of a conventional activated type known for classical hopping, and (iv) a gradual transition to a metallic-like transport at the highest temperatures. Springer Science+Business Media, LLC, 2010 Electrical transport nationallicence Variable range hopping nationallicence Transition metal oxides nationallicence Perovskite cobaltites nationallicence Neutron diffraction nationallicence Dlouhá M. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, 115 19, Prague 1, Czech Republic aut Hejtmánek J. Institute of Physics, ASCR, 162 00, Prague 6, Czech Republic aut Jirák Z. Institute of Physics, ASCR, 162 00, Prague 6, Czech Republic aut Knížek K. Institute of Physics, ASCR, 162 00, Prague 6, Czech Republic aut Veverka M. Institute of Physics, ASCR, 162 00, Prague 6, Czech Republic aut Vratislav S. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, 115 19, Prague 1, Czech Republic aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 747-751 1557-1939 24:1-2<747 2011 24 10948 https://doi.org/10.1007/s10948-010-0966-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0966-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dlouhá M. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, 115 19, Prague 1, Czech Republic aut NATIONALLICENCE 700 1- Hejtmánek J. Institute of Physics, ASCR, 162 00, Prague 6, Czech Republic aut NATIONALLICENCE 700 1- Jirák Z. Institute of Physics, ASCR, 162 00, Prague 6, Czech Republic aut NATIONALLICENCE 700 1- Knížek K. Institute of Physics, ASCR, 162 00, Prague 6, Czech Republic aut NATIONALLICENCE 700 1- Veverka M. Institute of Physics, ASCR, 162 00, Prague 6, Czech Republic aut NATIONALLICENCE 700 1- Vratislav S. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, 115 19, Prague 1, Czech Republic aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 747-751 1557-1939 24:1-2<747 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer