Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101923
Title: Magnetic properties of RCoO3 cobaltites (R = La, Pr, Nd, Sm, Eu). Effects of hydrostatic and chemical pressure
Authors: Panfilov, A. S.
Grechnev, G. E.
Lyogenkaya, A. A.
Pashchenko, V. A.
Zhuravleva, I. P.
Vasylechko, L. O.
Hreb, V. M.
Turchenko, V. A.
Novoselov, D.
Issue Date: 2019
Publisher: Elsevier B.V.
Citation: Magnetic properties of RCoO3 cobaltites (R = La, Pr, Nd, Sm, Eu). Effects of hydrostatic and chemical pressure / A. S. Panfilov, G. E. Grechnev, A. A. Lyogenkaya, et al. — DOI 10.1016/j.physb.2018.10.036 // Physica B: Condensed Matter. — 2019. — Vol. 553. — P. 80-87.
Abstract: We have investigated the temperature dependence of the magnetic susceptibility χ(T) of rare-earth cobaltites RCoO3 (R = La, Pr, Nd, Sm, Eu) in the temperature range 4.2–300 K and also the influence of hydrostatic pressure up to 2 kbar on their susceptibility at fixed temperatures T = 78 and 300 K. The specific dependence χ(T) observed in LaCoO3 and the anomalously large pressure effect (dln χ/dP ∼−100 Mbar− 1 for T = 78 K) are analyzed in the framework of a two-level model with energy levels difference Δ. The ground state of the system is assumed to be nonmagnetic with the zero spin of Co3+ ions, and magnetism at a finite temperature is determined by the excited magnetic spin state. The results of the analysis, supplemented by theoretical calculations of the electronic structure of LaCoO3, indicate a significant increase in Δ with a decrease in the unit cell volume under the hydrostatic pressure. In the series of RCoO3 (R = Pr, Nd, Sm, Eu) compounds, the volume of crystal cell decreases monotonically due to a decrease in the radius of R3 + ions. This leads to an increase in the relative energy Δ of the excited state (the chemical pressure effect), which manifests itself in a decrease in the contribution of cobalt ions to the magnetic susceptibility at a fixed temperature, and also in a decrease in the hydrostatic pressure effect on the susceptibility of RCoO3 compounds, which we have observed at T = 300 K. © 2018 Elsevier B.V.
Keywords: ELECTRONIC BAND STRUCTURE
HIGH-PRESSURE
MAGNETIC MEASUREMENTS
MAGNETO-VOLUME EFFECTS
RARE EARTH ALLOYS AND COMPOUNDS
COBALT COMPOUNDS
ELECTRONIC STRUCTURE
EUROPIUM COMPOUNDS
EXCITED STATES
GROUND STATE
HYDRAULICS
HYDROSTATIC PRESSURE
IONS
LANTHANUM COMPOUNDS
MAGNETIC SUSCEPTIBILITY
MAGNETIC VARIABLES MEASUREMENT
MAGNETISM
PINCH EFFECT
RARE EARTHS
SAMARIUM COMPOUNDS
TEMPERATURE DISTRIBUTION
CHEMICAL PRESSURE EFFECTS
ELECTRONIC BAND STRUCTURE
HIGH PRESSURE
MAGNETIC SPIN STATE
MAGNETO-VOLUME EFFECTS
RARE-EARTH ALLOYS AND COMPOUNDS
TEMPERATURE DEPENDENCE
THEORETICAL CALCULATIONS
HIGH PRESSURE EFFECTS
URI: http://hdl.handle.net/10995/101923
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85055473804
PURE ID: 8163745
6ccb0ea4-47ce-4afb-b48f-72fc9fe68f06
ISSN: 9214526
DOI: 10.1016/j.physb.2018.10.036
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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