Browsing by Subject "Magnetic properties"

Article

2-hydroxybenzophenone-controlled self-assembly of enneanuclear lanthanide(III) hydroxo coordination clusters with an “hourglass”-like topology

Mylonas-Margaritis, Ioannis; Kitos, Alexandros A.; Panteli, Chrysanthi C.; Skordi, Katerina; Tasiopoulos, Anastasios J.; Bekiari, Vlasoula; Escuer, Albert; Perlepes, Spyros P. (2017)

Enneanuclear lanthanide(III) hydroxo coordination clusters with an “hourglass”- or “sandglass”-like topology have been synthesized via 2-hydroxybenzophenone-controlled hydrolysis of the metal ions in ethanol

Article

Comparative study of the magnetic and magnetotransport properties of a metallic and a semiconducting member of the solid solution LaNixCo1-xO3

Androulakis, J.; Katsarakis, N.; Viskadourakis, Z.; Giapintzakis, John (2003)

A metallic and a semiconducting member of the solid solution LaNixCo1-xO3 (x=0.2, 0.6) with their magnetic and magnetotransport properties was investigated. The members of the perovskite solid solution were found on opposite ...

Article

Copper(II)/di-2-pyridyl ketone chemistry: A triangular cluster displaying antisymmetric exchange versus an 1D coordination polymer

Efthymiou, Constantinos G.; Raptopoulou, Catherine P.; Psycharis, Vassilis P.; Tasiopoulos, Anastasios J.; Escuer, Albert; Perlepes, Spyros P.; Papatriantafyllopoulou, Constantina (2013)

The systematic study of the reaction system copper(II) perchlorate/di-2- pyridyl ketone, (py)2CO, provided access to the new trinuclear compound [Cu3{(py)2C(OMe)(O)}3(H 2O)](ClO4)3·MeOH·0.6H 2O (1·MeOH·0.6H2O), and the 1D ...

Conference Object

Coulomb repulsive correlation in A3B5 semiconductor quantum dots in the presence of a magnetic field

Avetisyan, A. A.; Djotyan, Anahit P.; Moulopoulos, Konstantinos (2006)

The ground state total and correlation energies of a negative ion-electron and electron-electron systems in a parabolic QD with standard dispersion law are theoretically investigated in an external magnetic field by a ...

Article

The effect of correlated and point defects on the vortex lattice melting transition in single-crystal YBa2Cu3O7-δ

Kwok, W. K.; Fendrich, J.; Fleshler, S.; Welp, U.; Downey, J.; Crabtree, G. W.; Giapintzakis, John (1994)

The vortex melting transition Tm in several untwinned and twinned crystals is measured resistively in fields up to 8T. A Lindemann criterion for vortex lattice melting is obtained in addition to a sharp hysteresis in the ...

Article

Enneanuclear Ni(II) complexes from the use of the flexible ligand 2-pyridinealdoxime: The nature of the inorganic anion does not affect the chemical and structural identity of the cationic cluster

Stamatatos, Theocharis C.; Diamantopoulou, Eleanna; Tasiopoulos, Anastasios J.; Psycharis, Vassilis P.; Vicente, R.; Raptopoulou, Catherine P.; Nastopoulos, Vassilios; Escuer, Albert; Perlepes, Spyros P. (2006)

The use of 2-pyridinealdoximate(-1) [(py)CHNO-] in nickel(II) chemistry has been further investigated. The synthetic investigation has led to two new salts of the very recently reported (in the form of its tetraperchlorate ...

Article

A family of 3D coordination polymers composed of Mn19 magnetic units

Moushi, Eleni E.; Stamatatos, Theocharis C.; Wernsdorfer, W.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2006)

(Figure Presented) Singles networks: The use of 1,3-propanediol and of 2-methyl-1,3-propanediol in manganese carboxylate chemistry leads to two new 3D coordination polymers with an unprecedented Mn19 repeating unit. The ...

Article

Giant single-molecule magnets: A {Mn84} torus and its supramolecular nanotubes

Tasiopoulos, Anastasios J.; Vinslava, A.; Wernsdorfer, W.; Abboud, K. A.; Christou, George (2004)

A meeting of two magnetic worlds: The giant (ca. 4.2 nm) {Mn84} cluster, shown, has a torus structure and is a single-molecule magnet (SMM). It represents a meeting of the molecular (bottom-up) and classical (top-down) ...

Article

Heterometallic FeIII-CeIV complexes from the use of aliphatic aminoalcohol ligands

Kizas, Christos M.; Papatriantafyllopoulou, Constantina; Manos, Manolis J.; Tasiopoulos, Anastasios J. (2013)

Six novel heteronuclear FeIII/CeIV clusters with the ligands 3-amino-1-propanol (Hap) and 2-(hydroxymethyl)piperidine (Hhmpip) [FeIII4CeIV6O8(L) 4((CH3)3CCO2)12(RCO 2)4] (R = CH3, L = ap-, 1

Article

Hexanuclear complexes from the use of a series of amino-alcohol ligands in Fe chemistry

Papatriantafyllopoulou, Constantina; Kizas, Christos M.; Manos, Manolis J.; Boudalis, Athanassios K.; Sanakis, Yiannis; Tasiopoulos, Anastasios J. (2013)

Eight novel FeIII6 clusters with the amino-alcohol ligands 3-amino-1-propanol (apH), N-hydroxyethylpiperidine (N-hepipH), 2-hydroxyethylpiperidine (2-hepipH), 2-aminobenzylalcohol (2-abzaH), N-hydroxyethylmorpholine ...

Article

Magnetic and structural properties of stoichiometric thin Fe 3Si/GaAs(0 0 1) films

Ionescu, A.; Vaz, C. A. F.; Trypiniotis, Theodossis; Gürtler, C. M.; Vickers, M. E.; García-Miquel, H.; Bland, J. A. C. (2005)

In this study, we report experimental results on the structural and magnetic properties of epitaxial Fe3Si films grown on GaAs(0 0 1) by co-evaporation. X-ray reflectivity shows that relatively smooth interfaces are obtained ...

Article

Magnetic properties of Fe3O4 thin films grown on different substrates by laser ablation

Paramês, M. L.; Viskadourakis, Z.; Rogalski, M. S.; Mariano, J.; Popovici, N.; Giapintzakis, John; Conde, O. (2007)

Magnetite thin films have been grown onto (1 0 0)Si, (1 0 0)GaAs and (0 0 0 1)Al2O3, at substrate temperatures varying from 473 to 673 K, by UV pulsed laser ablation of Fe3O4 targets in reactive atmospheres of O2 and Ar, ...

Article

Mixed Transition-Metal - Lanthanide Complexes at Higher Oxidation States: Heteronuclear CeIV-MnIV Clusters

Tasiopoulos, Anastasios J.; O'Brien, T. A.; Abboud, K. A.; Christou, George (2004)

Wheels within wheels: A new family of mixed cerium(IV)-manganese(IV) clusters has been prepared spanning a range of Ce:Mn ratios from 3:2 to 1:6. The unusual core of the latter CeMn6 complex is shown (Ce green, Mn blue, O ...

Article

A new family of octanuclear Mn complexes with a rod-like topology

Moushi, Eleni E.; Stamatatos, Theocharis C.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2009)

Three new octanuclear compounds were prepared from reactions of [Mn(O2CR)2]·2H2O (R = Et or Ph) with the diols 1,3-propanediol (pdH2) or 2-methyl-1,3-propanediol (mpdH2) in the presence of NaN3. All three compounds ...

Article

New mixed-valence Mn6II/III complexes bearing oximato and azido ligands: Synthesis, and structural and magnetic characterization

Lampropoulos, Christos; Stamatatos, Theocharis C.; Manos, Manolis J.; Tasiopoulos, Anastasios J.; Abboud, K. A.; Christou, George (2010)

The combined use of the anion of methyl 2-pyridyl ketone oxime (mpko -) and azides (N3-) in non-carboxylate Mn chemistry has afforded two new Mn6 clusters, [Mn6O 3(N3)3(mpko)6(H2O) 3](ClO4J2 (1) and [Mn6O3(N3) 5(mpko)6(H2O)] ...

Article

Pulsed-laser deposition of NiMnSb thin films at moderate temperatures

Giapintzakis, John; Grigorescu, C.; Klini, A.; Manousaki, A.; Zorba, V.; Androulakis, J.; Viskadourakis, Z.; Fotakis, C. (2002)

Thin films of the half-Heusler alloy NiMnSb, which is predicted by band-structure calculations to be a half-metallic ferromagnet, were grown on various substrates (Si and InAs) using pulsed-laser deposition. The growth ...

Article

Relations of crystal structure to magnetic properties in the quasi-one-dimensional compound PbNi1.88Mg0.12V 2O8

Mastoraki, I.; Lappas, A.; Giapintzakis, John; Többens, D.; Hernández-Velasco, J. (2004)

The crystal structure of the quasi-one-dimensional oxide PbNi 1.88Mg0.12V2O8 has been studied by Rietveld analysis of combined high-resolution neutron and X-ray powder diffraction data at 300K and at low temperatures. The ...

Article

The search for cobalt single-molecule magnets: A disk-like Co IIICoII 6 cluster with a ligand derived from a novel transformation of 2-acetylpyridine

Kitos, Alexandros A.; Efthymiou, Constantinos G.; Papatriantafyllopoulou, Constantina; Nastopoulos, Vassilios; Tasiopoulos, Anastasios J.; Manos, Manolis J.; Wernsdorfer, W.; Christou, George; Perlepes, Spyros P. (2011)

The initial employment of 2-acetylpyridine, (py)(Me)CO, in Co cluster chemistry is reported, and the synthesis, crystal structure, and full magnetic study of [Co7(OH)6(L)6](ClO4) 3·1.6H2O (1·1.6H2O) are described

Article

Structure and Magnetic Property Control of Copper Hydroxide Acetate by Non-Classical Crystallization

Song, R.; Krasia-Christoforou, T.; Debus, C.; Cölfen, H. (2017)

Copper hydroxide acetate (CHA), one layered hydroxide compound with tunable magnetism, attracts great interest because of its potential applications in memory devices. However, ferromagnetism for CHA is only demonstrated ...

Article

Synthesis, structure, magnetic properties and aqueous solution characterization of p-hydroquinone and phenol iminodiacetate copper(ii) complexes

Stylianou, M.; Drouza, C.; Viskadourakis, Z.; Giapintzakis, John; Keramidas, A. D. (2008)

The reaction of Cu2+ acetate monohydrate with 2-[N,N′-bis(carboxymethyl)aminomethyl]-4-carboxyphenol (H 4cacp), 2-[N,N-bis(carboxymethyl)aminomethyl]hydroquinone (H 4cah) and the dinucleating 2,5-bis[N,N-bis(carboxymethy ...