Charge ordering and nonlinear electrical transport in quasi-one-dimensional organic chains with strong electrostatic interchain interactions

2007 ◽  
Vol 76 (7) ◽  
Author(s):  
Kentaro Okamoto ◽  
Toshiyuki Tanaka ◽  
Wataru Fujita ◽  
Kunio Awaga ◽  
Tamotsu Inabe
Keyword(s):  
Electrical Transport ◽  
Charge Ordering ◽  
One Dimensional ◽  
Interchain Interactions

Synthesis, Structure and Magnetic Properties of Monoclinic Nb12O29

2000 ◽  
Vol 658 ◽  
Author(s):  
J. E. L. Waldron ◽  
M. A. Green
Keyword(s):  
Magnetic Properties ◽  
Magnetic Order ◽  
Bulk Sample ◽  
Charge Ordering ◽  
Rapid Reduction ◽  
One Dimensional ◽  
Range Magnetic Order ◽  
A Charge ◽  
Ordering Transition ◽  
Long Range Magnetic Order

ABSTRACTThe synthesis, structure and magnetic properties of monoclinic Nb12O29 are described. The synthesis of a pure bulk sample is difficult due to the large number of other similar phases. It is achieved by rapid reduction of H-Nb2O5 with Nb metal. The compound is shown to undergo a charge ordering transition at low temperature which provokes long range magnetic order in an intriguing one dimensional arrangement.

Charge ordering and ferroelectric states in organic quasi-one-dimensional conductors

2002 ◽  
Vol 12 (9) ◽  
pp. 133-138
Author(s):  
F. Nad ◽  
P. Monceau
Keyword(s):  
Phase Transitions ◽  
Charge Ordering ◽  
Electron Interaction ◽  
Charge Symmetry ◽  
Low Frequencies ◽  
One Dimensional ◽  
Thermally Activated ◽  
Correlated Electron ◽  
Temperature Dependences ◽  
New Phase

In quasi-one-dimensional (TMTTF)2X conductors [1], where X are the various centro-symmetrical and non-centrosymmetrical anions, by study of temperature dependences of conductance G and dielectric permittivity $\varepsilon '$ at low frequencies we have found anomalies which are characteristic for phase transitions: an abrupt bend on the G(l/T) dependences with thermally activated decrease of G and sharp maxima of the E' near the charge ordering temperature corresponding to the E' divergence according to the Curie law. A number of evidences have been obtained in favor that driving force of these phase transitions is the long range correlated electron interaction yielding the charge ordering along the molecular chains (a lattice version of the Wigner crystal). The anion chains, electrically balanced with molecular chains, are of very importance in the formation and the stabilization of these new phase states. It appears that the form of charge symmetry of the anions determines to a great extent the types of the occurring transitions and the developing ground states.

scholarly journals Observation of Charge Ordering Signal in Monovalent Doped Nd0.75Na0.25-xKxMn1O3 (0 ≤ x ≤ 0.10) Manganites

2018 ◽  
Vol 7 (4.30) ◽  
pp. 85
Author(s):  
Sufia Aqilah Razali ◽  
Norazilah Ibrahim ◽  
Suhadir Shamsuddin ◽  
Mohamad Zaky Noh
Keyword(s):  
Crystalline Phase ◽  
Electrical Transport ◽  
Resistivity Measurement ◽  
Magnetic Behavior ◽  
Charge Ordering ◽  
Ferromagnetic Phase ◽  
Electrical Resistivity Measurement ◽  
Diffraction Measurement ◽  
The Difference ◽  
Lower Temperature

K doping in the compound of Nd0.75Na0.25-xKxMn1O3 (x = 0, 0.05 and 0.10) manganites have been investigated to study its effect on crystalline phase and surface morphology as well as electrical transport and magnetic properties. The structure properties of the Nd0.75Na0.25-xKxMnO3 manganite have been characterized using X-ray diffraction measurement and it proved that the crystalline phase of samples were essentially single phased and indexed as orthorhombic structure with space group of Pnma. The morphological study from scanning electron microscope showed there was an improvement on the grains boundaries and sizes as well as the compactness with K doping suggestively due to the difference of ionic radius. On the other hand, DC electrical resistivity measurement showed all samples exhibit insulating behavior. However, analysis of dlnρ/dT-1 vs. T revealed the clearly peaks could be observed at temperature 210K for x = 0 and the peaks were shifted to the lower temperature around 190 K and 165 K for x = 0.05 and x = 0.1 respectively, indicate the existence of charge ordering (CO) state in the compound. Meanwhile, the investigation on magnetic behavior showed all samples exhibit transition from paramagnetic phase to anti-ferromagnetic phase with decreasing temperature and the TN was observed to shift to lower temperature suggestively due to weakening of CO state

Coordination Polymers with a Bulky Perylene-Based Tetracarboxylate Ligand: Syntheses, Crystal Structures, and Luminescent Properties

2010 ◽  
Vol 63 (3) ◽  
pp. 463 ◽  
Author(s):  
Chun-Sen Liu ◽  
Min Hu ◽  
Song-Tao Ma ◽  
Qiang Zhang ◽  
Li-Ming Zhou ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Three Dimensional ◽  
Luminescent Properties ◽  
Supramolecular Interactions ◽  
Polymeric Chain ◽  
Stacking Interactions ◽  
One Dimensional ◽  
Π Stacking ◽  
Higher Dimensional ◽  
Interchain Interactions

To explore the coordination possibilities of perylene-based ligands with a larger conjugated π-system, four ZnII, MnII, and CoII coordination polymers with perylene-3,4,9,10-tetracarboxylate (ptc) and the chelating 1,10-phenanthroline (phen) ligands were synthesized and characterized: {[Zn2(ptc)(phen)2](H2O)10}∞ (1), {[Zn3(ptc)(OH)2(phen)2](H2O)3}∞ (2), {[Mn(ptc)0.5(phen)(H2O)2](H2O)1.5}∞ (3), and {[Co(ptc)0.5(phen)(H2O)2](H2O)2.5}∞ (4). Structural analysis reveals that complexes 1 and 2 both take one-dimensional polymeric chain structures with dinuclear and trinuclear units as nodes, respectively, which are further extended via the accessorial secondary interchain interactions, such as C–H···O H-bonding or aromatic π···π stacking interactions, to give rise to the relevant higher-dimensional frameworks. Compound 3 has a two-dimensional sheet structure that is further assembled to form a three-dimensional framework by interlayer π···π stacking interactions. Complex 4 is a one-dimensional ribbon-like array structure that is interlinked by the co-effects of intermolecular π···π stacking and C–H···π supramolecular interactions, resulting in a higher-dimensional framework from the different crystallographic directions. Moreover, complexes 1–4 exhibit strong solid-state luminescence emissions at room temperature, which mainly originate from intraligand π→π* transitions of ptc.

Crystal Structure and Possible Charge Ordering in One-Dimensional Ca3Co2O6

1996 ◽  
Vol 124 (1) ◽  
pp. 190-194 ◽  
Author(s):  
Helmer Fjellvåg ◽  
Egil Gulbrandsen ◽  
Siv Aasland ◽  
Arne Olsen ◽  
Bjørn C. Hauback
Keyword(s):  
Crystal Structure ◽  
Charge Ordering ◽  
One Dimensional
Sign in / Sign up

Export Citation Format

Share Document