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Tolga AytugTolga Aytug

Research Staff

B.S. Physics, Middle East Technical University, Ankara, Turkey, 1991
M.S., Physics, Middle East Technical University, Ankara, Turkey, 1994
Ph.D., Physics, University of Kansas, Lawrence, KS, 2000
Research/Teaching Assistant, University of Kansas, Lawrence, KS, 1997 - 1999
Post-graduate Research Associate, Oak Ridge National Laboratory, 1999 - 2000
Post-doctoral Research Associate,  Oak Ridge National Laboratory, 2000 - 2003
Research Assistant Professor, University
of Tennessee, 2003 - 2007
Research Staff, Oak Ridge National Laboratory, 2007 - Present

Research Interests:

Epitaxial growth of thin film heterostructures using various techniques including dc and rf-magnetron sputtering, pulsed laser ablation, electron beam evaporation, metal organic chemical vapor deposition (MOCVD) and chemical solution (Metal Organic Decomposition and Sol-Gel) approaches. Thermodynamic and kinetic effects on phase nucleation and structure formation

Relationship between film microstructure, defects, substrate surface (chemical and physical) and diffusion properties on an atomic scale for oxide, nitride and metal thin films

Physical, chemical, and electrical properties of superconducting materials, oxide, nitride, metal and CMR thin films including electrical transport and magnetic properties

Synthesis of two-dimensional, self-organized arrays of various oxide and metal nanoparticles with controlled size, orientation, and concentration on technological substrates

Mechanisms of magnetic vortex phenomena and correlation with substrate surface nanoparticle modification effects on growth-induced flux-pinning nanostructures in high-temperature superconducting films

Processing strategies for the fabrication of high critical current density superconducting wires to be utilized in power applications

Design optimization for the scale up of thin film fabrication on metal tapes by physical vapor and chemical solution deposition techniques for superconducting wire development

Novel metallization layers, die-attach materials and assembly concepts for high temperature SiC packaging

Deposition approaches for superhydrophobic coating


U.S. Patents Issued:

  1. Co-inventor, “Chemical Solution Deposition Method of Fabricating Highly Aligned MgO Templates”, Applied for U.S. patent, 2005.
  2. Co-inventor, “Superconductors on Iridium Substrates and Buffer Layers”, U.S. Patent No. 7,432,229 B2; October 7, 2008.
  3. Co-inventor, “Method of Depositing an Electrically Conductive Oxide Buffer Layer on a Textured Substrate and Articles Formed There from,” U.S. Patent No. 6,956,012; October 18, 2005.
  4. Co-inventor, “Buffer Layers and Articles for Electronic Devices,” U.S. Patent No. 6,764,770; July 20, 2004.
  5. Co-inventor, “Method of Depositing an Electrically Conductive Oxide Buffer layer on a Textured Substrate and Articles Formed There from,” U.S. Patent No. 6,617,283 B2; September 9, 2003.

Selected Publications:

  1. O. Polat, T. Aytug, M. Paranthaman, K. Kim, Y. Zhang, J.R. Thompson, D.K. Christen, X. Xiong, and V. Selvamanickam, “Direct growth of LaMnO3 cap buffer layers on IBAD-MgO for simplified template-based YBCO coated conductors,” J. Mater. Res., 23, 3021 (2008).
  2. T. Aytug, M. Paranthaman, K.J. Leonard, K. Kim, A.O. Ijaduola, E. Tuncer, J.R. Thompson, and D.K. Christen, “Enhanced flux pinning and critical currents in YBa2Cu3O7-d films by nanoparticle surface decoration: Extension to coated conductor templates,” J. Appl. Phys., 104, 043906 (2008).
  3. T. Aytug, M. Paranthaman, K.J. Leonard, S. Kang, P.M. Martin, L. Heatherly, A. Goyal, A.O. Ijaduola, J.R. Thompson, D.K Christen, R. Meng, I. Rusakova, and C.W. Chu, “Analysis of Flux Pinning in YBa2Cu3O7-d films by nanoparticle-modified substrate surfaces,” Phys. Rev. B. 74, 184505 (2006).
  4. T. Aytug, M. Paranthaman, A.A. Gapud, S. Kang, H.M. Christen, K.J. Leonard, P.M. Martin, J.R. Thompson, D.K Christen, R. Meng, I. Rusakova, C.W. Chu, and T.H. Johansen, “Enhancement of flux pinning and critical currents in YBa2Cu3O7-d films by nano-scale Iridium pre-treatment of substrate surfaces,” J. Appl. Phys. 98, 114309 (2005).
  5. A. Polyanskii, R.L.S. Emergo, J.Z. Wu, T. Aytug, D.K. Christen, G.K. Perkins, and D. Larbalestier, “Magneto-optical imaging and electromagnetic study of YBa2Cu3O7 vicinal films of variable thickness,” Phys. Rev. B 72, 174509 (2005).
  6. T. Aytug, M. Paranthaman, K.J. Leonard, H.Y. Zhai, M.S. Bhuiyan, E.A. Payzant, A. Goyal, S. Sathyamurthy, D.B. Beach, P.M. Martin, D.K. Christen, X. Li, T. Kodenkandath, U. Schoop, M.W. Rupich, H. E. Smith, T. Haugan, and P.N. Barnes, “Assessment of chemical solution synthesis and properties of Gd2Zr2O7 thin films as buffer layers for second generation high-temperature superconductor wires,” J. Mater. Res. 20, 2988 (2005).
  7. T. Aytug, M. Paranthaman, H. Y. Zhai, K. J. Leonard, A. A. Gapud, J. R. Thompson, A. Goyal, and D. K. Christen, “Iridium: An oxygen diffusion barrier and a conductive seed layer for RABiTS-based coated conductors,” IEEE Trans. on Appl. Supercond. 15, 2977 (2005).
  8. T. Aytug, M. Paranthaman, H.Y. Zhai, A.A. Gapud, K.J. Leonard, P.M. Martin, A. Goyal, J.R. Thompson, and D.K. Christen, “An approach for electrical self-stabilization of high-temperature superconducting wires for power applications,” Appl. Phys. Lett. 85, 2887 (2004).
  9. T. Aytug, M. Paranthaman, J.R. Thompson, A. Goyal, N. Rutter, H.Y. Zhai, A.A. Gapud, A.O. Ijaduola and D. K. Christen, “Electrical and magnetic properties of conductive Cu-based coated conductors,” Appl. Phys. Lett. 83, 3963 (2003).
  10. T. Aytug, M. Paranthaman, S. Sathyamurthy, B.W. Kang, D.F. Lee, R. Feenstra, A. Goyal, P.M. Martin, and D.K. Christen, “Continuous reel-to-reel chemical solution deposition of epitaxial Gd2O3 buffer layers on biaxially textured Ni-3at.% W-1.7at.% Fe alloy and Ni substrates for the fabrication of high Jc YBa2Cu3O7-d coated conductors,” J. Am. Ceram. Soc. 86, 257 (2003).
  11. T. Aytug, M. Paranthaman, B.W. Kang, S. Sathyamurthy, A. Goyal, and D.K. Christen, “La0.7Sr0.3MnO3: a single, conductive-oxide buffer layer for the development of YBa2Cu3O7-d coated conductors,” Appl. Phys. Lett., 79, 2205 (2001).
  12. T. Aytug, B.W. Kang, C. Cantoni, E.D. Specht, M. Paranthaman, A. Goyal, D.K. Christen, D.T. Verebelyi, J.Z. Wu, R.E. Ericson, C.L. Thomas, C.-Y. Yang, and S.E. Babcock, “Growth and characterization of conductive SrRuO3 and LaNiO3 multilayers on textured Ni tapes for high-Jc YBa2Cu3O7-d coated conductors,” J. Mater. Res. 16, 2661 (2001).
  13. T. Aytug, Y.Y. Xie, J.Z. Wu, and D.K. Christen, “Growth characteristics of HgBa2CaCu2O6 superconducting films on CeO2-buffered YSZ single crystals: an assessment for coated conductors,” Physica C 363, 107 (2001).
  14. T. Aytug, J.Z. Wu, B.W. kang, D.T. Verebelyi, C. Cantoni, E.D. Specht, A. Goyal, and M. Paranthaman, “An all-sputtered buffer layer architecture for high-Jc YBa2Cu3O7-d coated conductors”, Physica C 340, 33 (2000).
  15. T. Aytug, A.A. Gapud, S.H. Yoo, B.W. Kang, S.D. Kang, S.D. Gapud, and J.Z. Wu, “Effect of sodium doping on the oxygen distribution of Hg-1223 superconductors,” Physica C 313, 121 (1999).
  16. S.L. Yan, Y.Y. Xie, J.Z. Wu, T. Aytug, A.A. Gapud, B.W. Kang, L. Fang, M. He, J.R. Liu, and W.K. Chu, “High critical current density in epitaxial HgBa2CaCu2Ox thin films,” Appl. Phys. Lett. 73, 2989 (1998).
  17. T. Aytug, B.W. Kang, S.L. Yan, Y.Y. Xie, and J.Z. Wu, “Stability of Hg-based high-Tc superconducting thin films,” Physica C 307, 117 (1998).

Materials Chemistry Group Staff

 Provided by Oak Ridge National Laboratory's Chemical Sciences Division 
Rev: April 2009