scholarly journals Long-range dynamical magnetic order and spin tunneling in the cooperative paramagnetic states of the pyrochlore analogous spinel antiferromagnets CdYb2X4 ( X=S or Se)

2017 ◽  
Vol 96 (13) ◽  
Author(s):  
P. Dalmas de Réotier ◽  
C. Marin ◽  
A. Yaouanc ◽  
C. Ritter ◽  
A. Maisuradze ◽  
...  
Keyword(s):  
Long Range ◽  
Magnetic Order ◽  
Spin Tunneling

scholarly journals Emergent long-range magnetic order in ultrathin (111)-oriented LaNiO3 films

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Margaret M. Kane ◽  
Arturas Vailionis ◽  
Lauren J. Riddiford ◽  
Apurva Mehta ◽  
Alpha T. N’Diaye ◽  
...  
Keyword(s):  
Long Range ◽  
Degrees Of Freedom ◽  
Magnetic Order ◽  
Magnetic Ordering ◽  
Anomalous Hall Effect ◽  
X Ray Diffraction ◽  
X Ray ◽  
Range Magnetic Order ◽  
Film Substrate ◽  
Long Range Magnetic Order

AbstractThe emergence of ferromagnetism in materials where the bulk phase does not show any magnetic order demonstrates that atomically precise films can stabilize distinct ground states and expands the phase space for the discovery of materials. Here, the emergence of long-range magnetic order is reported in ultrathin (111) LaNiO3 (LNO) films, where bulk LNO is paramagnetic, and the origins of this phase are explained. Transport and structural studies of LNO(111) films indicate that NiO6 octahedral distortions stabilize a magnetic insulating phase at the film/substrate interface and result in a thickness-dependent metal–insulator transition at t = 8 unit cells. Away from this interface, distortions relax and bulk-like conduction is regained. Synchrotron x-ray diffraction and dynamical x-ray diffraction simulations confirm a corresponding out-of-plane unit-cell expansion at the interface of all films. X-ray absorption spectroscopy reveals that distortion stabilizes an increased concentration of Ni2+ ions. Evidence of long-range magnetic order is found in anomalous Hall effect and magnetoresistance measurements, likely due to ferromagnetic superexchange interactions among Ni2+–Ni3+ ions. Together, these results indicate that long-range magnetic ordering and metallicity in LNO(111) films emerges from a balance among the spin, charge, lattice, and orbital degrees of freedom.

High-resolution polarization analysis study of long-range magnetic order in cuprates

2005 ◽  
Vol 71 (21) ◽  
Author(s):  
Zahirul Islam ◽  
D. Haskel ◽  
J. C. Lang ◽  
G. Srajer ◽  
X. Liu ◽  
...  
Keyword(s):  
High Resolution ◽  
Long Range ◽  
Magnetic Order ◽  
Polarization Analysis ◽  
Analysis Study ◽  
Range Magnetic Order ◽  
Long Range Magnetic Order

Gd substitutions in the TmCo2Laves phase: the onset of long-range magnetic order in the itinerant subsystem

1995 ◽  
Vol 7 (3) ◽  
pp. 597-610 ◽  
Author(s):  
E Gratz ◽  
R Hauser ◽  
A Lindbaum ◽  
M Maikis ◽  
R Resel ◽  
...  
Keyword(s):  
Long Range ◽  
Magnetic Order ◽  
Range Magnetic Order ◽  
Long Range Magnetic Order

scholarly journals Long Range and Short Range Magnetic Order in Orthorhombic LiMnO2

1997 ◽  
Vol 128 (2) ◽  
pp. 209-214 ◽  
Author(s):  
J.E. Greedan ◽  
N.P. Raju ◽  
I.J. Davidson
Keyword(s):  
Long Range ◽  
Short Range ◽  
Magnetic Order ◽  
Range Magnetic Order ◽  
Orthorhombic Limno2

scholarly journals Long-range magnetic order and the Darwin Lagrangian

2000 ◽  
Vol 61 (2) ◽  
pp. 1199-1205 ◽  
Author(s):  
Vishal Mehra ◽  
Jayme De Luca
Keyword(s):  
Long Range ◽  
Magnetic Order ◽  
Range Magnetic Order ◽  
Long Range Magnetic Order

Strongly correlated transition metal oxides

2019 ◽  
Author(s):  
Ελένη Αζά
Keyword(s):  
Dielectric Permittivity ◽  
Single Crystal ◽  
Single Crystals ◽  
Long Range ◽  
Ground State ◽  
Degrees Of Freedom ◽  
Magnetic Order ◽  
Range Order ◽  
Long Range Order ◽  
Strongly Correlated

The discovery of materials with coexisting magnetic and ferroelectric orders, has revived theinterest of condensed matter physics and materials’ science communities maintaining the greatpromise of such fundamental mechanisms in devising applications ranging from portablemagnetoelectric (ME) sensors and memories to radar technologies. The present PhD thesis is a study in the field of strongly correlated systems where coupled properties arise from the interplay of charge and spin degrees of freedom over lattice topologies enabling competing magnetic interactions and therefore emergence of coupling of electric and magnetic order. Non-perovskite, two-dimensional (2D) Na-Mn-O oxides are revisited in scope of this in both polycrystalline and large single crystal forms. Among Na-deficient polymorphs, hexagonal α-Na0.7MnO2 (single crystals) has been investigated for the first time as a playground of competing interactions due to mixed Mnvalence (Mn4+ / Mn3+), fostered by Na vacancies in the structure. The competition of FM (Mn3+-Mn4+) and AFM (Mn3+ -Mn3+) interactions is believed to be the origin of the magnetic instability leading to a glassy ground state leaving also their footprint in the dielectric permittivity measurements. Competing FM and AFΜ interactions are also investigated as the origin of the anisotropic magnetic properties witnessed in a-NaxMnO2 (x= 0.96) single crystals. Neutron single crystal experiments show a well-established AFM long range order which vanishes above 26 K whilea coexistent canted antiferromagnetic state persists up to 45 K. In both alpha powders and aNa0.96MnO2 single crystals, the dielectric permittivity suggests the onset of the commensuratemagnetic long range order (T~ 45 K) which in the case of the powders allows a magnetocapacitance effect. Compositional modulations in β-NaMnO2, which are depicted as an intergrowth of α- and βlike oxygen coordinations, are found to trigger a proper-screw magnetic ground state which evolves into collinear commensurate AFM state. Features in the dielectric permittivity coincide with the onset of the commensurate AFM order giving away also the contribution of the α- structural domains. Further understanding of the mechanisms that dictate the relief of frustrated interactions and establishment of magnetic order together with the role of structural complexity in the form of domains or domain-walls is a direction that warrants further exploration as it will help us to resolve whether other coupled electron degrees of freedom are likely to be generated in this family of oxides.

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