EPR Study of the [Fe4S4]+ State in Single Crystals of (Et4N)3[Fe4S4(SCH2Ph)4]: g-Tensors of Kramers Doublets of the S = 3/2 Ground State

1995 ◽  
Vol 117 (28) ◽  
pp. 7513-7519 ◽  
Author(s):  
Jocelyne Gloux ◽  
Pierre Gloux
Keyword(s):  
Single Crystals ◽  
Ground State

POSSIBLE EVIDENCE FOR A VALENCE BAND SATELLITE IN PHOTOEMISSION SPECTRA FROM Sc(0001)

1994 ◽  
Vol 01 (04) ◽  
pp. 649-653 ◽  
Author(s):  
A.J. PATCHETT ◽  
S.S. DHESI ◽  
R.I.R. BLYTH ◽  
S.D. BARRETT
Keyword(s):  
Electronic Structure ◽  
Rare Earth ◽  
Binding Energy ◽  
Single Crystals ◽  
Valence Band ◽  
Ground State ◽  
Rare Earth Metals ◽  
Final State ◽  
Bulk Single Crystals ◽  
The Creation

An intense photoemission feature is observed at a binding energy of ~10 eV in the UV photoemission spectra from the (0001) surfaces of bulk single crystals of rare-earth metals. This emission cannot be explained in terms of ground state electronic structure and we have been unable to attribute its existence to the presence of contamination of the surface. We present some evidence that may indicate its origin lies in the creation, by the photoemission process, of a metastable two-hole final state.

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.

Magnetic-Ground-State Properties in Praseodymium Single Crystals

1972 ◽  
Vol 6 (1) ◽  
pp. 313-317 ◽  
Author(s):  
K. Andres ◽  
E. Bucher ◽  
J. P. Maita ◽  
L. D. Longinotti ◽  
R. Flukiger
Keyword(s):  
Single Crystals ◽  
Ground State ◽  
Magnetic Ground State ◽  
Ground State Properties

Transport and pressure properties of Na 0.5−δ CoO 2 single crystals with metallic ground state

2008 ◽  
Vol 81 (4) ◽  
pp. 47005 ◽  
Author(s):  
G. Garbarino ◽  
F. Morales ◽  
M. Núñez Regueiro ◽  
M. Armand ◽  
P. Lejay
Keyword(s):  
Single Crystals ◽  
Ground State

Γ6-ground state resonance in (, Er) B6 single crystals

1983 ◽  
Vol 95 (3-4) ◽  
pp. 186-190 ◽  
Author(s):  
H. Luft ◽  
K. Baberschke ◽  
K. Winzer
Keyword(s):  
Single Crystals ◽  
Ground State ◽  
State Resonance

Light Absorption by Pyrene Single Crystals Between 4 and 300 °K

1973 ◽  
Vol 28 (6) ◽  
pp. 973-979 ◽  
Author(s):  
D. Fischer ◽  
G. Naundorf ◽  
W. Klöpffer
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Single Crystals ◽  
Absorption Edge ◽  
Ground State ◽  
Light Absorption ◽  
Room Temperature ◽  
Polarized Light ◽  
Equilibrium Distance ◽  
Exciton Transport

Pyrene single crystals have been grown from zone refined material by sublimation and from the melt. The absorption edge has been measured for thick and thin crystals at room temperature. Thin crystals have been successfully cooled below the phase transition temperature (123 °K) without cracking. The sharp absorption peak at 376 nm vanishes at this temperature while the fluorescence spectrum remains unchanged. Using polarized light below 50 °K, a band with a maximum at 410 nm appears whose intensity increases with decreasing temperature. It is concluded that this band is due to ground-to-excimer state absorption in the ground state equilibrium distance of the pyrene molecules. The consequences of this finding for excimer-exciton transport is discussed.

Electron Paramagnetic Resonance Spectra of the Ground‐State Triplet Diphenylmethylene and Fluorenylidene Molecules in Single Crystals

1965 ◽  
Vol 43 (6) ◽  
pp. 2006-2016 ◽  
Author(s):  
R. W. Brandon ◽  
G. L. Closs ◽  
C. E. Davoust ◽  
C. A. Hutchison ◽  
B. E. Kohler ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Single Crystals ◽  
Ground State ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic
Sign in / Sign up

Export Citation Format

Share Document