• 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  

      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  

      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  

      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 ...
    • 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, ...
    • 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 ...
    • Conference Object  

      Transport properties of the doped thermoelectric material K2Bi8-xSbxSe13 

      Brazis, P. W.; Ireland, J. R.; Lane, M. A.; Kyratsi, Theodora; Chung, D. Y.; Kanatzidis, M. G.; Kannewurf, C. R. (Affiliation: Dept. of Electrical and Comp. Eng., Northwestern University, Evanston, IL 60208-3118, United StatesCorrespondence Address: Brazis, P.W.Dept. of Electrical and Comp. Eng., Northwestern University, Evanston, IL 60208-3118, United States, 2001)
      The synthesis, physicochemical, spectroscopic, and structural characterization of the compound β-K2Bi8Se13 has been previously reported. The results indicated that this material should be investigated further for possible ...