Magnetic dilution of a honeycomb lattice XY magnet CoTiO3

2022 ◽  
Author(s):  
Ezekiel James Horsley ◽  
Xin Rao ◽  
Sang Bum Yi ◽  
Young-June Kim
Keyword(s):  
Single Phase ◽  
Honeycomb Lattice ◽  
Neel Temperature ◽  
Néel Temperature ◽  
Antiferromagnetic Ordering ◽  
Microscopic Models ◽  
Magnetic Dilution ◽  
Magnetic Ions ◽  
Ordering Transition ◽  
Dilution Level

Abstract We report our study of cobalt (II) titanate, CoTiO3, in which magnetic Co ions are replaced by non-magnetic ions. The antiferromagnetic ordering transition of CoTiO3 around 37 K is described with ferromagnetic honeycomb layers coupled antiferromagnetically along the crystallographic c direction. The effect of magnetic dilution on the Néel temperature of this material is investigated through the doping of Zn2+ and Mg2+ in place of Co2+ for various dilution levels up to x + y = 0.46 in Co1-x-yZnxMgyTiO3. Single phase polycrystalline samples have been synthesized and their structural and magnetic properties have been examined. A linear relation between dilution and the Néel temperature is observed over a wide doping range. A linear extrapolation would suggest that the required dilution level to suppress magnetic order is around x + y ∽ 0.74, well beyond the classical percolation threshold. The implication of this observation for microscopic models for describing CoTiO3 is discussed.

Ferroelectric Properties of Magnetoferroelectric YMnO3 Epitaxial Films at around the Neel Temperature

2010 ◽  
Vol 445 ◽  
pp. 144-147
Author(s):  
Takeshi Yoshimura ◽  
Kazuhiro Maeda ◽  
Atsushi Ashida ◽  
Norifumi Fujimura
Keyword(s):  
Domain Wall ◽  
Wall Motion ◽  
Ferroelectric Properties ◽  
Domain Wall Motion ◽  
Epitaxial Films ◽  
Switching Behavior ◽  
Neel Temperature ◽  
Néel Temperature ◽  
Antiferromagnetic Ordering ◽  
Polarization Electric Field

The switching behavior of the ferroelectric polarization of magnetoferroelectric YMnO3 epitaxial films at around the Néel temperature was investigated to discuss the effect of the antiferromagnetic ordering on the ferroelectric domain wall motion. From neutron diffractions to investigate the antiferromagnetic ordering and measurements of polarization-electric field, dielectric constant, and the time constant of the domain wall motion, the change of the domain wall motion is suggested at around 120 K, which is higher than the Néel temperature (~80 K).

Variation of the Neel temperature with magnetic dilution in CopMg1-pO

1986 ◽  
Vol 19 (31) ◽  
pp. L747-L751 ◽  
Author(s):  
R Kannan ◽  
A S Pavlovic ◽  
M S Seehra
Keyword(s):  
Neel Temperature ◽  
Néel Temperature ◽  
Magnetic Dilution

ANTIFERROMAGNETIC ORDERING IN Y-BA-CU-PT-O

1987 ◽  
Vol 01 (02) ◽  
pp. 479-484 ◽  
Author(s):  
V.T. Kovachev ◽  
E.S. Vlakhov ◽  
K.A. Nenkov ◽  
V.A. Lovchinov ◽  
M.M. Gospodinov ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
High Temperature ◽  
Magnetic Moment ◽  
Neel Temperature ◽  
Néel Temperature ◽  
High Temperature Superconducting ◽  
Antiferromagnetic Ordering

A high temperature superconducting Y-Ba-Cu-Pt-O compound has been investigated. The results on magnetization and magnetic susceptibility of the compound are presented. A hysteresis of the magnetic moment at 4.2K is observed. This hysteresis occures, most probably, due to an antiferromagnetic ordering in the material. The Curie asymtotic temperature and Nèel temperature of the material are reported.

scholarly journals The Study of Magnetic Properties for Non-Magnetic Ions Doped BiFeO3

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4061
Author(s):  
Yongtao Li ◽  
Liqing Liu ◽  
Dehao Wang ◽  
Hongguang Zhang ◽  
Xuemin He ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Local Structure ◽  
Metal Ion ◽  
Single Phase ◽  
Sol Gel ◽  
X Ray ◽  
Co Doping ◽  
Magnetic Ions ◽  
X Ray Absorption ◽  
Fe Ions

BiFeO3 is considered as a single phase multiferroic. However, its magnetism is very weak. We study the magnetic properties of BiFeO3 by Cu and (Cu, Zn). Polycrystalline samples Bi(Fe0.95Cu0.05)O3 and BiFe0.95(Zn0.025Cu0.025)O3 are prepared by the sol-gel method. The magnetic properties of BiFe0.95(Zn0.025Cu0.025)O3 are greater than that of BiFeO3 and Bi(Fe0.95Cu0.05)O3. The analyses of X-ray absorption fine structure data show that the doped Cu atoms well occupy the sites of the Fe atoms. X-ray absorption near edge spectra data confirm that the valence state of Fe ions does not change. Cu and Zn metal ion co-doping has no impact on the local structure of the Fe and Bi atoms. The modification of magnetism by doping Zn can be understood by the view of the occupation site of non-magnetically active Zn2+.

The effect of high pressure on the Néel temperature of-manganese

1971 ◽  
Vol 47 (2) ◽  
pp. K99-K101 ◽  
Author(s):  
A. Sawaoka ◽  
T. Soma ◽  
S. Saito ◽  
Y. Endoh
Keyword(s):  
High Pressure ◽  
Neel Temperature ◽  
Néel Temperature

Conduction Characteristics of Charge Ordering Type Ferroelectrics,YFe2O4

2006 ◽  
Vol 966 ◽  
Author(s):  
Ken Imamura ◽  
Yoichi Horibe ◽  
Takeshi Yoshimura ◽  
Norifumi Fujimura ◽  
Shigeo Mori ◽  
...  
Keyword(s):  
Room Temperature ◽  
Inflection Point ◽  
Oxygen Deficiency ◽  
Complex Impedance ◽  
Charge Ordering ◽  
Neel Temperature ◽  
Ohmic Conduction ◽  
Néel Temperature ◽  
Impedance Measurements ◽  
Conduction Properties

ABSTRACTElectrical conduction properties of charge ordering type ferroelectrics YFe2O4 were investigated. YFe2O4 was synthesized in reduced atmosphere at 1200 °C. Oxygen partial pressure of the reduced atmosphere was controlled by the equilibrium state of CO and CO2. YFe2O4 is paramagnetic at room temperature and has Néel temperature around 250K. The Néel temperature was decreased with increasing the amount of oxygen deficiency. Moreover, YFe2O4 showed ohmic conduction from 260 to 100 K. The temperature dependence of the DC conductivity showed an inflection point at the Néel temperature, which indicated the development of charge ordering of Fe2+ and Fe3+ ions. From the complex impedance measurements, the equivalent circuits of YFe2O4 with different oxygen deficiency were determined at various temperatures.

Néel temperature of zinc-blende, MBE-grown MnTe layers: modification by the crystal growth conditions

2004 ◽  
Vol 1 (4) ◽  
pp. 953-956 ◽  
Author(s):  
W. Szuszkiewicz ◽  
E. Dynowska ◽  
J. Z. Domagala ◽  
E. Janik ◽  
E. Łusakowska ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Growth Conditions ◽  
Neel Temperature ◽  
Néel Temperature ◽  
Zinc Blende
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