Spontaneous magnetic order and spin and charge entanglement of a coupled spin-electron model on a decorated square lattice composed from trigonal bipyramids

2021 ◽  
Vol 104 (10) ◽  
Author(s):  
Lucia Gálisová ◽  
Jozef Strečka
Keyword(s):  
Magnetic Order ◽  
Square Lattice ◽  
Electron Model

QUANTUM FRUSTRATED MAGNETS: FROM THEORY TO EXPERIMENTS

2003 ◽  
Vol 17 (28) ◽  
pp. 5021-5030
Author(s):  
F. MILA
Keyword(s):  
Detailed Analysis ◽  
Long Range ◽  
Magnetic Order ◽  
Quantum Fluctuations ◽  
Square Lattice ◽  
Frustrated Magnets ◽  
Range Magnetic Order ◽  
Long Range Magnetic Order ◽  
New Compounds ◽  
The Way

This paper presents an overview of the properties predicted and in many cases observed in quantum frustrated magnets. The emphasis will be put on two new compounds which have opened the way to a detailed analysis of two aspects of the problem: (i) Li 2 VOSiO 4, a realisation of the J1 - J2 model on the square lattice in which quantum fluctuations stabilise long-range magnetic order; (ii) Cu 2 Te 2 O 5 Br 2, the first system believed to possess low-lying singlet excitations inside a singlet-triplet gap.

Magnetic order of the two-dimensional antiferromagnetic ¼-depleted square lattice

2006 ◽  
Vol 18 (5) ◽  
pp. 1805-1814 ◽  
Author(s):  
Yong-Jun Liu ◽  
Yung-Chung Chen ◽  
Min-Fong Yang ◽  
Chang-De Gong
Keyword(s):  
Magnetic Order ◽  
Square Lattice ◽  
Two Dimensional

scholarly journals Structure, electric and magnetic properties of Pb(V1-xMx)O3, M=Ti, Fe compounds

2014 ◽  
Vol 70 (a1) ◽  
pp. C978-C978
Author(s):  
Pierre Bordet ◽  
Claire Colin ◽  
Céline Darie ◽  
Alexandru Okos ◽  
Aurel Pop
Keyword(s):  
Magnetic Order ◽  
Domain Size ◽  
Type Systems ◽  
Magnetic Behaviour ◽  
Square Lattice ◽  
Charge Model ◽  
Ferroelectric Domains ◽  
Spin Glass Behaviour ◽  
Ti Substitution ◽  
Fe Substitution

It is well known that ferroelectricity and magnetic order are considered as hardly compatible in perovskite compounds. In this respect, PbVO3 is quite interesting: it is isostructural to ferroelectric PbTiO3 (P4mm) and contains V4+ spin ½ cations [1]. However, previous studies have failed to observe magnetic order in PbVO3, which was attributed either to a 2D magnetic behaviour or to magnetic frustration on a square lattice [2]. We present here the study of the substitution of V4+ by Fe3+ or Ti4+ cations, aiming at a better understanding of the relations between structural, magnetic and electric properties. PbVO3 single crystals and powders of substituted compounds were prepared at 6GPa , 9500C in belt and Conac type systems. A single crystal diffraction experiment confirmed the proposed structure for PbVO3, evidencing merohedral twinning related to ferroelectric domains also observed by SEM. For the Ti substitution, a complete Pb(V4+ 1-x Ti4+ x)O3 solid solution is observed for x = 0 to 1, while the Fe substitution stops at x=0.5 due to heterovalent cation replacement, the formula being Pb(V4+ 1-2x V5+ x Fe3+ x)O3. The cation oxidation states were checked by XANES (FAME-ESRF). The structures were studied by joint refinements of NPD (D1B-ILL) and XPD (Laboratory and ID31-ESRF) data, yielding the coordinations of V and M cations and the spontaneous polarization using a point charge model. A decrease of tetragonality, domain size along the c-axis and polarization is observed with increasing substitution. For the Ti series, the magnetic behaviour progressively changes from 2D to Curie-Weiss with increasing x. In the case of Fe, a broad peak in magnetic susceptibility is observed, at temperatures increasing from 12K to 30K for x going from 0.1 to 0.5. This was checked as due to a spin glass behaviour. No sign of magnetic order was observed by NPD. At the same time, a broad, frequency dependent anomaly of the dielectric constant is observed, reminiscent of a relaxor behaviour.

Magnetic order in a S= frustrated antiferromagnet on a square lattice

2004 ◽  
Vol 272-276 ◽  
pp. E659-E660 ◽  
Author(s):  
A Bombardi ◽  
L Paolasini ◽  
P Carretta ◽  
J Rodriguez-Carvajal ◽  
P Millet ◽  
...  
Keyword(s):  
Magnetic Order ◽  
Square Lattice

scholarly journals Spherical neutron polarimetry in multiferroics under external stimuli

2014 ◽  
Vol 70 (a1) ◽  
pp. C151-C151
Author(s):  
Vladimir Hutanu ◽  
Andrew Sazonov ◽  
Georg Roth ◽  
In-Hwan Oh ◽  
Max Baum ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Magnetic Structure ◽  
Magnetic Order ◽  
Strong Electric Field ◽  
Electric Polarization ◽  
Square Lattice ◽  
Microscopic Mechanism ◽  
Coupling Energy ◽  
Neutron Polarimetry

Study of multiferroics, materials simultaneously having more than one primary ferroic order parameter, is a hot topic of material sciences. The most extensively studied class of these compounds is the family of magnetoelectric multiferroics, where ferroelectricity can be induced by various types of magnetic orderings via the relativistic spin-orbit interaction. As a consequence of the cross coupling between spins and electric polarization, the spectacular control of the ferroelectric polarization by external magnetic field and the manipulation of the magnetic order via electric field can often be realized in these systems. Depending on the symmetry and microscopic mechanism of the multiferroicity the coupling energy between magnetic and electric ordering parameters can significantly vary. Classical neutron diffraction often fails in the precise determining of the complex magnetic structure in the multiferroics due to the presence of the statistically distributed domains in the macroscopic sample. Using spherical neutron polarimetry (SNP), known also as 3D polarization analysis, it is possible not only to precisely determine the complex magnetic structure, but also to investigate in-situ its evolution with external parameters and to control the magnetic domains distribution under the influence of the external electric or/and magnetic field. Here we will present some SNP results on few different multiferroic materials. In some of them, e.g. square lattice 2D antiferromagnet Ba2CoGe2O7, even strong electric field does not change the magnetic order. However rater week magnetic field is sufficient to create a mono-domain structure and to rotate spins in the plane. In other e.g. incommensurate (spiral) magnetic structure of the TbMnO3, solely electric field is sufficient to fully control the chirality of the magnetic structure. In the case of Cr2O3 both electric and magnetic fields should be applied in parallel in order to switch between the different antiferromagnetic domains.

scholarly journals Magnetic order-disorder transitions on a one-third-depleted square lattice

2017 ◽  
Vol 95 (4) ◽  
Author(s):  
H.-M. Guo ◽  
T. Mendes-Santos ◽  
W. E. Pickett ◽  
R. T. Scalettar
Keyword(s):  
Magnetic Order ◽  
Square Lattice
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