scholarly journals Unusual Electron Correlations in NaxCoO2Due to the Spin-State Quasidegeneracy of Cobalt Ions

2008 ◽  
Vol 176 ◽  
pp. 50-76 ◽  
Author(s):  
Jiří Chaloupka ◽  
Giniyat Khaliullin
Keyword(s):  
Spin State ◽  
Electron Correlations ◽  
Cobalt Ions

scholarly journals Studies on the spin-state equilibria of cobalt ions in the system La1−x Na x Co1−x Nb x O3 (x⩽0·40)

1989 ◽  
Vol 12 (1) ◽  
pp. 53-56
Author(s):  
Om Parkash ◽  
N Chaturvedi ◽  
M Tiwari ◽  
Devendra Kumar
Keyword(s):  
Spin State ◽  
Cobalt Ions

The effect of temperature and pressure on the spin state of cobalt ions in La1−xPrxCoO3 compounds

2020 ◽  
Vol 46 (6) ◽  
pp. 606-614
Author(s):  
A. S. Panfilov ◽  
A. A. Lyogenkaya ◽  
G. E. Grechnev ◽  
V. A. Pashchenko ◽  
L. O. Vasylechko ◽  
...  
Keyword(s):  
Spin State ◽  
Effect Of Temperature ◽  
Cobalt Ions ◽  
Temperature And Pressure

Spin state and magnetic interaction of cobalt ions in niobium-doped cobaltites

2006 ◽  
Vol 48 (4) ◽  
pp. 722-725 ◽  
Author(s):  
I. O. Troyanchuk ◽  
D. V. Karpinsky ◽  
R. Szymczak
Keyword(s):  
Spin State ◽  
Magnetic Interaction ◽  
Cobalt Ions ◽  
Niobium Doped

scholarly journals Controlling the nuclearity and topology of cobalt complexes through hydration at the ppm level

2020 ◽  
Vol 8 (13) ◽  
pp. 4401-4407 ◽  
Author(s):  
Raúl Castañeda ◽  
Mathieu Rouzières ◽  
Rodolphe Clérac ◽  
Jaclyn L. Brusso
Keyword(s):  
Spin State ◽  
Cobalt Complexes ◽  
Level Control ◽  
Cobalt Ions ◽  
Degree Of Hydration ◽  
And Topology ◽  
Magnetic Analysis ◽  
Ppm Level

Polynuclear cobalt complexes in which nuclearity and topology can be controlled via ppm level control over the degree of hydration (300 vs. 10 000 ppm). Structural and magnetic analysis were used to elucidate the spin state of the cobalt ions.

Exploration of spin state and exchange integral of cobalt ions in stoichiometric ZnCo2O4 spinel oxides

2016 ◽  
Vol 108 (14) ◽  
pp. 143102 ◽  
Author(s):  
Xiangli Che ◽  
Liping Li ◽  
Guangshe Li
Keyword(s):  
Spin State ◽  
Exchange Integral ◽  
Cobalt Ions ◽  
Spinel Oxides

Spin state of cobalt ions in NdCoO3

2006 ◽  
Vol 51 (1) ◽  
pp. 11-15 ◽  
Author(s):  
A. P. Sazonov ◽  
I. O. Troyanchuk ◽  
V. V. Sikolenko
Keyword(s):  
Spin State ◽  
Cobalt Ions

Spin State of Cobalt Ions and the Magnetic Properties of Heavily Ba-Substituted Cobaltites with Perovskite Structure

2018 ◽  
Vol 255 (10) ◽  
pp. 1800315
Author(s):  
Igor Troyanchuk ◽  
Maxim Bushinsky ◽  
Nina Tereshko ◽  
Clemens Ritter ◽  
Vadim Sikolenko ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spin State ◽  
Perovskite Structure ◽  
Cobalt Ions

Influence of Electron Correlations on Magnetic Properties in Transition Metals in View of Degeneration

2009 ◽  
Vol 152-153 ◽  
pp. 555-558
Author(s):  
V.E. Shilov ◽  
E.V. Shilova
Keyword(s):  
Magnetic Properties ◽  
Spin State ◽  
Experimental Verification ◽  
Initial Segment ◽  
High Spin State ◽  
The Self ◽  
Electron Correlations ◽  
Optical Branch ◽  
Self Energy ◽  
Loop Approximation

Transition from high-spin state to low-spin state is considered in this work. The self - energy in one-loop approximation was calculated. The three – orbital periodic Anderson-Hubbard model is used to obtain an initial segment of an optical branch in view of degeneration. The possibility of experimental verification of the received result by a method of non-elastic dispersion of slow neutrons is mentioned.

Anomalous behavior of displacement correlation function and strain in lanthanum cobalt oxide analyzed both from X-ray powder diffraction and EXAFS data

2017 ◽  
Vol 32 (S1) ◽  
pp. S151-S154 ◽  
Author(s):  
V. Efimov ◽  
V. Sikolenko ◽  
I. O. Troyanchuk ◽  
D. Karpinsky ◽  
E. Efimova ◽  
...  
Keyword(s):  
Spin State ◽  
Powder Diffraction ◽  
Spin Transition ◽  
High Spin State ◽  
Atomic Displacement ◽  
Relative Displacement ◽  
Rhombohedral Structure ◽  
Cobalt Ions ◽  
Exafs Data ◽  
X Ray

A combined X-ray powder diffraction (XPD) and high-resolution extended X-ray absorption fine structure (EXAFS) at the Co and Ga K-edges study has been performed for LaCoO3 and LaGaO3 ceramics, the latter sample was used as a reference without spin transitions. Based on the X-ray diffraction data, we have found that isotropic atomic displacement parameters (ADP) or mean-squared displacement of the Co–O bond exhibit gradual growth below ~50 K, wherein the strain dependencies testify rapid increase below 150 K for the LaCoO3 having rhombohedral structure. No similar features could be observed for LaGaO3 sample. Above ~100 K the isotropic ADP of the Co–O bond indicate a gradual growth, whereas strain curves show distinct bend near the spin-state transition temperature at about 150 K. According to the EXAFS data, the correlated parallel mean squared relative displacement (MSRD||) of Co–O and Ga–O bonds exhibit a gradual growth above 150 K; however, in the LaCoO3 this parameter is notably bigger. It is supposed that at low temperature the cobalt ions are dominantly in low-spin (LS) state, while certain amount of Co3+ ions located within the surface layer of the crystallines have high-spin state (HS). Temperature growth leads to a gradual transformation of the HS state of the cobalt ions into the highly-hybridized intermediate-spin (IS) state, while the cobalt ions located in the inner part of the crystallines remain LS configuration up to 150 K. Further temperature increase leads to a spin transition of the Co3+ ions located within the crystallines from the LS state into the IS one.

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