Browsing by Author "Giapintzakis, John"
Now showing items 1-20 of 149
-
Article
Absence of nonlinear meissner effect in (formula presented)
Carrington, A.; Kim, J. T.; Giapintzakis, John (1999)We present measurements of the field and temperature dependence of the penetration depth (Formula presented) in high purity, untwinned single crystals of (Formula presented) in all three crystallographic directions. The ...
-
Article
Aerial Oxidation of a VIV-Iminopyridine Hydroquinonate Complex: A Trap for the VIV-Semiquinonate Radical Intermediate
Stylianou, M.; Drouza, C.; Giapintzakis, John; Athanasopoulos, G. I.; Keramidas, A. D. (2015)The reaction of 2,5-bis[N,N′-bis(2-pyridyl-aminomethyl)aminomethyl]-p-hydroquinone (H2bpymah) with VO2+ salts in acetonitrile or water at a low pH (2.2-3.5) results in the isolation of [VIV(O)(Cl)2(μ-bpymah)], the ...
-
Article
Ambiguous Role of Growth-Induced Defects on the Semiconductor-to-Metal Characteristics in Epitaxial VO2/TiO2 Thin Films
Mihailescu, Cristian N.; Symeou, Elli; Svoukis, Efthymios; Negrea, Raluca F.; Ghica, Corneliu; Teodorescu, Valentin; Tanase, Liviu C.; Negrila, Catalin; Giapintzakis, John (2018)Controlling the semiconductor-to-metal transition temperature in epitaxial VO2 thin films remains an unresolved question both at the fundamental as well as the application level. Within the scope of this work, the effects ...
-
Article
Ambiguous Role of Growth-Induced Defects on the Semiconductor-to-Metal Characteristics in Epitaxial VO2/TiO2 Thin Films
Mihailescu, C. N.; Symeou, E.; Svoukis, E.; Negrea, R. F.; Ghica, C.; Teodorescu, V.; Tanase, L. C.; Negrila, C.; Giapintzakis, John (2018)Controlling the semiconductor-to-metal transition temperature in epitaxial VO2 thin films remains an unresolved question both at the fundamental as well as the application level. Within the scope of this work, the effects ...
-
Article
Anisotropy of the optical dielectric function in the ab plane for YBa2Cu3O7-
Kotz, A. L.; Klein, M. V.; Lee, W. C.; Giapintzakis, John; Ginsberg, D. M.; Veal, B. W. (1992)We report ellipsometric measurements from surfaces of three single-crystal samples of YBa2Cu3O7. Two of the samples were untwinned with Tc=90 and 66 K. The third sample was a tetragonal single crystal with low oxygen content ...
-
Article
Anisotropy of the resistivity in the a-b plane of a superconducting YBa2Cu3O7-δ single crystal
Kim, J.-T.; Giapintzakis, John; Ginsberg, D. M. (1996)We have measured the in-plane longitudinal resistivities pa and pb as functions of temperature and magnetic field. The measurements were all made on the same detwinned single crystal of YBa2Cu3O7-δ (YBCO). Defining Tc to ...
-
Conference Object
ARPES studies of the superconducting gap in high-temperature superconductors
Ding, H.; Norman, M. R.; Giapintzakis, John; Campuzano, Juan C.; Claus, H.; Wuehl, H.; Randeria, M.; Bellman, A.; Yokoya, T.; Takahashi, T.; Mochiku, T.; Kadowaki, Kazuo; Ginsberg, Don M. (Affiliation: Argonne Natl. Lab. and Univ. of, Illinois/Chicago, Chicago, IL, USA, United StatesCorrespondence Address: Ding, H.Argonne Natl. Lab. and Univ. of, Illinois/Chicago, Chicago, IL, USAUnited States, 1996)Using high resolution angle-resolved photoemission spectroscopy (ARPES), we measure the superconducting gap and its momentum dependence in the high temperature superconductors Bi 2Sr 2CaCu 2O 8 (Bi2212) and YBa 2Cu 3O 6.95 ...
-
Article
Broad compositional tunability of indium tin oxide nanowires grown by the vapor-liquid-solid mechanism
Zervos, Matthew; Mihailescu, C. N.; Giapintzakis, John; Luculescu, C. R.; Florini, N.; Komninou, Ph; Kioseoglou, J.; Othonos, A. (2014)Indium tin oxide nanowires were grown by the reaction of In and Sn with O2 at800 °C via the vapor-liquid-solid mechanism on 1 nm Au/Si(001). We obtain Sn doped In2O3 nanowires having a cubic bixbyite crystal structure by ...
-
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
Coexistence of ferromagnetic and glassy behavior in semiconducting LaNi 0.2Co 0.8O 3
Androulakis, J.; Katsarakis, N.; Giapintzakis, John (2002)Systematic dc and ac magnetic susceptibility studies have been performed on single-phase LaNi 0.2Co 0.8O 3 powder samples. Evidence of hysteresis loops supports the existence of ferromagnetic correlations that lead to a ...
-
Article
A comparative mass spectroscopic study between infrared and ultraviolet laser ablation of a superconducting YBa2Cu3O7-x target
Giapintzakis, John; Sfounis, A.; Velegrakis, M. (1999)Time-of-flight mass spectra of ionic species produced by the laser ablation of a YBa2Cu3O7-x target have been measured. The experimental geometry and laser conditions used in this study are similar to those used for the ...
-
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
Comparison of free surface polarization of NiMnSb and Co2 MnSi
Miyoshi, Y.; Bugoslavsky, Y.; Syed, M. H.; Robinson, T.; Cohen, L. F.; Singh, L. J.; Barber, Z. H.; Grigorescu, C. E. A.; Gardelis, S.; Giapintzakis, John; Roy, W. Van (2006)We present a systematic study of the polarization of the transport current from a variety of NiMnSb and Co2 MnSi thin films and bulk material using point contact Andreev reflection spectroscopy. The simple analysis suggests ...
-
Article
Constraints on the temperature dependence of the magnetic penetration depth of superconducting Bi2Sr2CaCu2O8+x from measurements of the low-temperature specific heat
Stupp, S. E.; Lee, W. C.; Giapintzakis, John; Ginsberg, D. M. (1992)We have measured the low-temperature (2"10 K) specific heat of polycrystalline Bi2Sr2CaCu2O8+x in zero applied field and in an applied magnetic field of 1 T. We find no field-induced enhancement of the specific heat, to ...
-
Article
Correlations of synthetic, spectroscopic, structural, and speciation studies in the biologically relevant Cobalt(II) - Citrate system: The tale of the first aqueous dinuclear Cobalt(II) - Citrate complex
Kotsakis, N.; Raptopoulou, C. P.; Tangoulis, V.; Terzis, A.; Giapintzakis, John; Jakusch, T.; Kiss, T.; Salifoglou, A. (2003)Synthetic efforts targeting soluble species of Co(II) with the low molecular mass physiological ligand citric acid led to the isolation of the first dinuclear complex [Co2(C6H5O7)2 (H2O)4]2-, at pH ∼5, in the form of its ...
-
Article
Current transport and thermoelectric properties of very high power factor Fe3O4/SiO2/p-type Si(001) devices
Zervos, Matthew; Viskadourakis, Z.; Athanasopoulos, G.; Flores, R.; Conde, O.; Giapintzakis, John (2014)The current transport and thermoelectric properties of Fe3O4/SiO2/p-type Si(001) heterostructures with Fe3O4 thicknesses of 150, 200, and 350 nm have been investigated between 100 and 300K. We observe a sharp drop of the ...
-
Article
Data storage applications based on LiCoO2 thin films grown on Al2O3 and Si substrates
Svoukis, E.; Mihailescu, C. N.; Mai, V. H.; Schneegans, O.; Breza, K.; Lioutas, C.; Giapintzakis, John (2015)In this study, LiCoO2 thin films were investigated for data storage applications based on scanning probe mediated approaches. LiCoO2, compared to other materials proposed for scanning probe mediated nanoscale patterning, ...
-
Article
Development of the optical conductivity with doping in single-domain YBa2Cu3O6+x
Cooper, S. L.; Kotz, A. L.; Karlow, M. A.; Klein, M. V.; Lee, W. C.; Giapintzakis, John; Ginsberg, D. M. (1992)Optical studies of single-domain crystals of YBa2Cu3O6+x allow us to separate the CuO2-plane and CuO-chain contributions to the optical conductivity as a function of doping between 0.025 and 5.5 eV. We find several interesting ...
-
Article
Direct Evidence of Lithium Ion Migration in Resistive Switching of Lithium Cobalt Oxide Nanobatteries
Nguyen, Van Son; Mai, Van Huy; Senzier, Pascale Auban; Pasquier, Claude; Wang, Kang; Rozenberg, Marcelo J.; Brun, Nathalie; March, Katia; Jomard, François; Giapintzakis, John; Mihailescu, Cristian N.; Kyriakides, Evripides; Nukala, Pavan; Maroutian, Thomas; Agnus, Guillaume; Lecoeur, Philippe; Matzen, Silvia; Aubert, Pascal; Franger, Sylvain; Salot, Raphaël; Albouy, Pierre-Antoine; Alamarguy, David; Dkhil, Brahim; Chrétien, Pascal; Schneegans, Olivier (2018)Lithium cobalt oxide nanobatteries offer exciting prospects in the field of nonvolatile memories and neuromorphic circuits. However, the precise underlying resistive switching (RS) mechanism remains a matter of debate in ...
-
Article
Direct measurement of the anisotropy of the resistivity in the a-b plane of twin-free, single-crystal, superconducting YBa2Cu3O7-
Friedmann, T. A.; Rabin, M. W.; Giapintzakis, John; Rice, J. P.; Ginsberg, D. M. (1990)We have measured the resistivity tensor in one nearly twin-free crystal and one twin-free crystal of YBa2Cu3O7-. The first crystal was grown with a large twin-free region. We removed the twins in the second crystal by ...