Pressure effect on magnetic susceptibility of LaCoO3

Автор(и)

  • A.S. Panfilov B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
  • G.E. Grechnev B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
  • I.P. Zhuravleva B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
  • A.A. Lyogenkaya B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
  • V.A. Pashchenko B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
  • B.N. Savenko Joint Institute for Nuclear Research, Dubna 141980, Russia
  • D. Novoselov M.N. Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences Yekaterinburg 620108, Russia
  • D. Prabhakaran Ural Federal University, Yekaterinburg 620002, Russia
  • I.O. Troyanchuk Department of Physics, University of Oxford, Oxford, OX1 3PU, Great Britain

DOI:

https://doi.org/10.1063/1.5030456

Ключові слова:

LaCoO3 compound, magnetic susceptibility, pressure effect, DFT U calculations, spin states crossover.

Анотація

The effect of pressure on magnetic properties of LaCoO3 is studied experimentally and theoretically. The pressure dependence of magnetic susceptibility χ of LaCoO3 is obtained by precise measurements of χ as a function of the hydrostatic pressure P up to 2 kbar in the temperature range from 78 K to 300 K. A pronounced magnitude of the pressure effect is found to be negative in sign and strongly temperature dependent. The obtained experimental data are analysed by using a two-level model and DFT+U calculations of the electronic structure of LaCoO3. In particular, the fixed spin moment method was employed to obtain a volume dependence of the total energy difference Δ between the low spin and the intermediate spin states of LaCoO3. Analysis of the obtained experimental χ(P) dependence within the two-level model, as well as our DFT+U calculations, have revealed the anomalous large decrease in the energy difference Δ with increasing of the unit cell volume. This effect, taking into account a thermal expansion, can be responsible for the temperatures dependence of Δ, predicting its vanishing near room temperature.

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Опубліковано

2018-02-19

Як цитувати

(1)
Panfilov, A.; Grechnev, G.; Zhuravleva, I.; Lyogenkaya, A.; Pashchenko, V.; Savenko, B.; Novoselov, D.; Prabhakaran, D.; Troyanchuk, I. Pressure Effect on Magnetic Susceptibility of LaCoO3. Fiz. Nizk. Temp. 2018, 44, 432-438.

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Низькотемпературний магнетизм

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