Spin-State Transition, Magnetism and Local Crystal Structure in Eu

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概要

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• The doping series Eu<inf>1-x</inf>Ca<inf>x</inf>CoO<inf>3-\delta</inf>provides a rather peculiar way to study the spin-state transitions in cobalt-based complex oxides since partial substitution of Eu³⁺ions by Ca²⁺ions does not increase the mean valence of cobalt but is accompanied by appearance of oxygen vacancies in the ratio \delta\sim x/2. In the parent compound EuCoO<inf>3</inf>, the low spin (LS)--intermediate spin (IS) or high spin (HS) transition takes place at temperatures so high that the chemical decomposition prevents its direct observation. The substitution of Eu³⁺by Ca²⁺shifts the spin state transition to lower temperatures and the associated energy gap \Delta in octahedrally-coordinated Co³⁺ions changes from 1940 K in EuCoO<inf>3</inf>to 1540 K in Eu<inf>0.9</inf>Ca<inf>0.1</inf>CoO<inf>2.95</inf>and 1050 K in Eu<inf>0.8</inf>Ca<inf>0.2</inf>CoO<inf>2.9</inf>. Besides, each O^2-vacancy reduces the local coordination of two neighboring Co³⁺ions from octahedral to pyramidal thereby locally creating magnetically active sites which couple to dimers. These dimers form another gapped magnetic system with a very different energy scale, D_{\text{dim}}\sim 3 K, on the background of the intrinsically non-magnetic lattice of octahedrally-coordinated low-spin Co³⁺ions.

• 2013-04-15

著者

• CHEN Jin-Ming

  National Synchrotron Radiation Research Center (NSRRC)

• Lin Jiunn-yuan

  Institute Of Physics National Chiao Tung University

• Soldatov Alexander

  Southern Federal University, 344090 Rostov-on-Don, Russia

• Vasiliev Alexander

  Low Temperature Physics and Superconductivity Department, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia

• Kao Cheng-Nan

  National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan

• Vasilchikova Tatyana

  Low Temperature Physics and Superconductivity Department, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia

• Volkova Olga

  Low Temperature Physics and Superconductivity Department, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia

• Kamenev Anton

  Low Temperature Physics and Superconductivity Department, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia

• Kaul Andrey

  Low Temperature Physics and Superconductivity Department, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia

• Kuzmova Tatyana

  Low Temperature Physics and Superconductivity Department, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia

• Tsymbarenko Dmitry

  Low Temperature Physics and Superconductivity Department, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia

• Lomachenko Kirill

  Southern Federal University, 344090 Rostov-on-Don, Russia

• Streltsov Sergey

  Institute of Metal Physics, 620990 Ekaterinburg, Russia

• Abdel-Hafiez Mahmoud

  Leibniz Institute for Solid State and Materials Research, IFW Dresden, 01171 Dresden, Germany

• Wolter Anja

  Leibniz Institute for Solid State and Materials Research, IFW Dresden, 01171 Dresden, Germany

• Klingeler Rüdiger

  Kirchhoff Institute for Physics, University of Heidelberg, 69120 Heidelberg, Germany

• Chen Jin-Ming

  National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan

• Lin Jiunn-Yuan

  Institute of Physics, National Chiao-Tung University, 30076 Hsinchu, Taiwan

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