Browsing by Subject "Single crystals"

Article

C-axis josephson tunneling between YBa2Cu3O7 − δ and Pb: Direct evidence for mixed order parameter symmetry in a high- Tc superconductor

Kouznetsov, K. A.; Sun, A. G.; Chen, B.; Katz, A. S.; Bahcall, S. R.; Clarke, J.; Dynes, R. C.; Gajewski, D. A.; Han, S. H.; Maple, M. B.; Giapintzakis, John; Kim, J.-T.; Ginsberg, T. M. (1997)

C-axis Josephson tunneling experiments in which a conventional superconductor (Pb) is deposited across a single twin boundary of a YBa2Cu3O7 − δ (YBCO) crystal. We measure the critical current as a function of the magnitude ...

Article

Coordination Complexes of a Neutral 1,2,4-Benzotriazinyl Radical Ligand: Synthesis, Molecular and Electronic Structures, and Magnetic Properties

Morgan, I. S.; Mansikkamäki, Akseli; Zissimou, Georgia A.; Koutentis, Panayiotis Andreas; Rouzières, M.; Tuononen, H. M.; Clérac, R. (2015)

A series of d-block metal complexes of the recently reported coordinating neutral radical ligand 1-phenyl-3-(pyrid-2-yl)-1,4-dihydro-1,2,4-benzotriazin-4-yl (1) was synthesized. The investigated systems contain the ...

Article

Hall effect in detwinned single crystals of YBa2(Cu1-xZnx)3O7-δ in the mixed state

Schegolev, A. I.; Giapintzakis, John; Manson, J. T.; Ginsberg, D. M.; Dumler, I. (1996)

The effect of zinc doping on the mixed-state Hall effect in detwinned single crystals of YBa2Cu3O7-δ has been studied. We observe a sign reveral of the Hall effect in crystals with a superconducting transition temperature ...

Article

Inducing single-molecule magnetism in a family of loop-of-loops aggregates: Heterometallic Mn40Na4 clusters and the homometallic Mn44 analogue

Moushi, Eleni E.; Lampropoulos, Christos; Wernsdorfer, W.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2010)

The syntheses, crystal structures, and magnetic properties of a new family of heterometallic Mn40Na4 and homometallic Mn44 loop-of-loops aggregates are reported. The reactions of [Mn3O(O 2CMe)6(py)3]•py with 1,3-propanediol ...

Article

KrF pulsed laser deposition of La5Ca9Cu24O41 thin films on various substrates

Pervolaraki, M.; Athanasopoulos, G. I.; Saint-Martin, R.; Revcolevschi, A.; Giapintzakis, John (2009)

Recent studies on single crystals of cuprate oxides containing spin chains and ladders have reported large anisotropic magnon-mediated thermal conductivity. A potential use of thin films of such materials could be in the ...

Article

Magneto-transport properties of NiMnSb thin films on InSb single crystals: Negative giant magnetoresistance

Gardelis, S.; Androulakis, J.; Viskadourakis, Z.; Papadopoulou, E. L.; Giapintzakis, John; Rai, S.; Lodha, G. S.; Roy, S. B. (2007)

In this study we investigated the magneto-transport properties of the ohmic contact between polycrystal-line NiMnSb thin films grown by pulsed laser deposition and n-type degenerate InSb (100) substrates. An unusual negative ...

Article

A microporous Co2+ metal organic framework with single-crystal to single-crystal transformation properties and high CO2 uptake

Moushi, Eleni E.; Kourtellaris, Andreas; Spanopoulos, Ioannis; Manos, Manolis J.; Papaefstathìou, Giannis S.; Trikalitis, Pantelis N.; Tasiopoulos, Anastasios J. (2015)

The synthesis and characterization of {[Co9(INA)18(H2O)6]·11DMF·15H2O}∞ (Co9-INA·11DMF·15H2O) (INA- = the anion of isonicotinic acid) is reported. It exhibits a rigid 3D-porous structure with a Co9 repeating unit consisting ...

Article

A Mn15 single-molecule magnet consisting of a supertetrahedron incorporated in a loop

Moushi, Eleni E.; Masello, A.; Wernsdorfer, W.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2010)

Two new Mn15 clusters consisting of a supertetrahedron which is incorporated in a loop are reported. The reactions of [Mn(O2CEt) 2]·2H2O with the diols 1,3-propanediol (H 2pd) or 2-methyl-1,3-propanediol (H2mpd) in the ...

Article

New antimony(III) halide complexes with dithiocarbamate ligands derived from thiuram degradation: The effect of the molecule's close contacts on in vitro cytotoxic activity

Urgut, O. S.; Ozturk, I. I.; Banti, Christina N.; Kourkoumelis, Nikolaos; Manoli, Maria; Tasiopoulos, Anastasios J.; Hadjikakou, Sotiris K. (2016)

Antimony(III) halide complexes of the formulae {[SbBr(Me2DTC)2]n} (1), {[SbI(Me2DTC)2]n} (2) and {[(Me2DTC)2Sb(μ2-I)Sb(Me2DTC)2]+.I3-} (3) (Me2DTC = dimethyldithiocarbomate) were synthesized from SbX3, (X = Br or I) and ...

Article

Sign reversal of the Hall effect in YBa2(Cu1-x)3O7-δ single crystals

Neiman, R. L.; Giapintzakis, John; Ginsberg, D. M.; Mochel, J. M. (1995)

We have measured the in-plane Hall effect and in-plane resistivity of cobalt-doped YBa2Cu3O7-δ (YBCO) single-crystal samples. The concentration of cobalt ranged from 1 to 3%. As the applied field was varied, a sign reversal ...

Article

Single crystal coordinating solvent exchange as a general method for the enhancement of the photoluminescence properties of lanthanide MOFsAAA

Kyprianidou, Eleni J.; Lazarides, T.; Kaziannis, S.; Kosmidis, C.; Itskos, Grigorios; Manos, Manolis J.; Tasiopoulos, Anastasios J. (2014)

The discovery of new methods for the post-synthesis modification of materials is essential in order to establish suitable strategies for the tuning of their properties in a rational manner. Here we present a series of ...

Article

Single crystal coordinating solvent exchange as a general method for the enhancement of the photoluminescence properties of lanthanide MOFsAAA

Kyprianidou, Eleni J.; Lazarides, T.; Kaziannis, S.; Kosmidis, C.; Itskos, Grigorios; Manos, Manolis J.; Tasiopoulos, Anastasios J. (2014)

The discovery of new methods for the post-synthesis modification of materials is essential in order to establish suitable strategies for the tuning of their properties in a rational manner. Here we present a series of ...

Article

Spectroscopic characterization of C-4 substituted 3,5-dichloro-4H-1,2,6-thiadiazines

Theodorou, E.; Ioannidou, Heraklidia A.; Ioannou, Theodosia A.; Kalogirou, Andreas S.; Constantinides, Christos P.; Manoli, Maria; Koutentis, Panayiotis Andreas; Hayes, Sophia C. (2015)

Three 3,5-dichloro-4H-1,2,6-thiadiazines, which differ according to the electron withdrawing nature of their substituent at C-4: (a) 3,5-dichloro-4-methylene-4H-1,2,6-thiadiazine (5a), (b) 3,5-dichloro-4H-1,2,6-thiadiazin-4-one ...

Conference Object

Stoichiometry issues in pulsed laser deposition of the ferromagnetic alloy NiMnSb

Grigorescu, C. E. A.; Monnereau, O.; Manea, S. A.; Notonier, R.; Klini, A.; Zorba, V.; Manousaki, A.; Giapintzakis, John; Fotakis, C. (Affiliation: NIRDO, BucharestAffiliation: MADIREL, Univ. Provence Centre St. Charles, Marseille, FranceAffiliation: Natl. Inst. Res. Devmt. Mat. Phy., BucharestAffiliation: Foundation for Res. and Technology, HELLAS, Inst. Electron. Structure and Laser, Heraklion, Crete, GreeceCorrespondence Address: Grigorescu, C.E.A.NIRDO, Bucharest, 2002)

We report on the reproducible growth of stoichiometric thin films of ferromagnetic intermetallic compound NiMnSb by pulsed laser deposition (PLD) on various substrates. The films are grown at moderate temperature (around ...

Article

Structural, magnetic, and electrical properties of NiMnSb thin films grown on InSb by pulsed-laser deposition

Gardelis, S.; Androulakis, J.; Giapintzakis, John; Monnereau, O.; Buckle, P. D. (2004)

We report the growth of single-phase, stoichiometric polycrystalline thin films of the half-Heusler ferromagnet NiMnSb, predicted to be half-metallic, on single crystal InSb (100) substrates heated at 200°C by pulsed laser ...

Article

Symmetry of differential optical responses of normal and superconducting phases in single-crystal YBCO

Studenmund, W. R.; Fishman, I. M.; Kino, G. S.; Giapintzakis, John (1995)

We measured differential optical reflectivity (DOR) of YBCO single domains. DOR measurements reject the temperature independent bulk reflectivity and reveal dR dT. These measurements detect the superconducting transition, ...

Article

The first polyoxomolybdenum carbonate compound: Synthesis and crystal structure of (NH4)5[(Mo2vO4) 3(μ6-CO3)(μ-CO3) 3(μ-OH)3]· 0.5CH3OH 1

Manos, Manolis J.; Keramidas, Anastasios D.; Woollins, J. D.; Slawin, A. M. Z.; Kabanos, Themistoklis A. (2001)

The first polyoxomolybdenum carbonate has been synthesized and its single crystal structure as well as its IR, UV-vis and 13C NMR spectra have been determined.

Conference Object

Thermal conductivity measurements of anisotropic bulk samples using the 3ω method

Athanasopoulos, G. I.; Svoukis, E.; Viskadourakis, Z.; Giapintzakis, John (Affiliation: Mechanical and Manufacturing Engineering, University of Cyprus, 75 Kallipoleos Avenue, Nicosia, 1678, CyprusAffiliation: Materials Science and Technology Department, University of Crete, P.O. Box 2208, Heraklion Crete 710 03, GreeceCorrespondence Address: Athanasopoulos, G. I.Mechanical and Manufacturing Engineering, University of Cyprus, 75 Kallipoleos Avenue, Nicosia, 1678, Cyprus, 2010)

The 3ω method has been applied to measure the anisotropic thermal conductivity of single crystals of SiO2 (quartz) and La 14-yCayCu24O41 (y = 9 and 10). A two-dimensional heat conduction model along with properly oriented ...

Article

Thermoelectric properties of LaNi1-xCoxO3 solid solution

Migiakis, P.; Androulakis, J.; Giapintzakis, John (2003)

The thermoelectric properties of the selected members of the LaNi 1-xCoxO3 solid solution were investigated. The electrical properties of the solution investigated were determined from the doping level. The substitution ...

Article

Topochemical transformations of substituted cyclopentanone transition metal adducts

Theocharis, Charis R. (2002)

The application of chelation to transition metal ions as a means of controlling the packing motifs of substituted catechols and of substituted malonates has been studied. Substituted malonates have been shown to be capable ...