Materials Characterization Group Webpage

 

Following is under construction!!!

Research Interests

Dr. Kwon's research interests are in experimental condensed matter and materials physics.  Her research is mainly centered around perovskite oxide materials.  She has been involved in thin film and multilayer fabrications, the characterization of structural and physical properties, and novel device developments using perovskite oxides.  She is currently developing a variable temperature scanning laser microscope (VTSLM) as a new characterization instrument.  VTSLM measures local optical response, and that can be related non-uniformities responsible to reduce the performance of materials.  

Research Projects

        Room Temperature Scanning Laser Microscopy

        Variable Temperature Scanning Laser Microscopy

        Variable Temperature Scanning Laser Microscopy

        Scanning Probe Microscopy

Research Facilities

        Room Temperature Scanning Laser Microscope

        Variable Temperature Scanning Laser Microscope

        Multimode Scanning Probe Microscope, Nanoscope III, Digital Instrument.

List of Publications

1)   Publications

      These are the papers published after my appointment at CSULB (Aug. 1999). 

1.      "Electrodynamic Properties of coplanar waveguides made from high-temperature superconducting Yba2Cu3O7-d electrodes on nonlinear dielectric SrTiO3 substreates", A. T. Findikoglu, D. W. Reagor, K.O. Rasmussen, A. R. Bishop, N. Gronbech-Jensen, Q. X. Jia, Y. Fan, C. Kwon, and L. A. Ostrovsky, J. Appl. Phy. 86, 1558 (1999).

2.      “Comparative Study of Broadband Electrodynamic Properties of Single-Crystal and Thin Film Strontium Titanate”, A. T. Findikoglu, Q. X. Jia, C. Kwon, D. W. Reagor, G. Kaduchak, K. O. Rasmussen, and A. R. Bishop, App. Phys. Lett. 75, 4189 (1999).

3.      “Improved Superconducting Properties of SmBa2Cu3O7-d Films using YBa2Cu3O7-d Buffer Layer”, C. Kwon, L. R. Kinder, Y. Fan, Y. Gim, A. T. Findikoglu, J. F. Bingert, J. Y. Coulter, S. R. Foltyn, D. E. Peterson, and Q. X. Jia, Phil. Mag. B. 80, 45 (2000).

4.      “Microwave surface resistance of HgBa2CaCu2O6 +  thin films”, R. S. Aga, Shao-lin Yan, Y. Xie, S. Han, J. Z. Wu, Q. X. Jia, and C. Kwon, Appl. Phys. Lett. 76, 1606 (2000).

5.      "Laser Induced Dynamic Spectral Weight Transfer in La0.7Ca0.3MnO3", Ahmed I. Lobad, A. J. Taylor, C. Kwon, and S. A. Trugman, Chemical Physics 251, 227 (2000).

6.       “H-dependent magnetic domain structures in La0.67Sr0.33MnO3 thin films”, M. E. Hawley, G. W. Brown, P. C. Yashar, and C. Kwon, J. Crystal Growth 211, 86 (2000).

7.      “Frequency and temperature dependence of complex conductance of ultrathin YBa2Cu3O7-x films: a study of vortex-antivortex pair unbinding”, V. A. Gasparov, I. E. Batov, Q. Li, and C. Kwon, Physica B 284, 1021 (2000).

8.      “Microstructure and dielectric properties of Ba1-xSrxTiO3 films grown on LaAlO3 substrates”, Y. Gim, T. Hudson, Y. Fan, C. Kwon, A.T. Findikoglu, B.J. Gibbons, B.H. Park, and Q. X. Jia, Appl. Phys. Lett. 77, 1200 (2000).

9.      “Microstructure of epitaxial La0.7Ca0.3MnO3 thin films grown on LaAlO3 and SrTiO3”, C. J. Lu, Z. L. Wang, C. Kwon, and Q. X. Jia, J. Appl. Phys. 88, 4032 (2000).

10.    “Spin-lattice interaction in colossal magnetoresistance manganites”, Ahmed I. Lobad, R. D. Averitt, Chuhee Kwon, and A. J. Taylor, Appl. Phys. Lett. 77, 4025 (2000).

11.    “Ultrafast Conductivity Dynamics in Colossal Magnetoresistance Manganites”, R. D. Averitt, Ahmed I. Lobad, C. Kwon, S. A. Trugman, V. K. Thorsmolle, and A. J. Taylor, Phys. Rev. Lett. 87, 017401 (2001).

12.    “Imaging Transport Current Distribution in High Temperature Superconductors Using Room Temperature Scanning Laser Microscope”, B. E. Klein, S. Seo, C. Kwon, B. H. Park, and Q. X. Jia, Accepted to Rev. Sci. Inst. (2002).

 

2)   Publications - Conference proceedings

1.      “Growth of LiNbO3 on Single Crystal Sapphire Substrates Using Pulsed Laser Deposition”, Y. Gim, K. T. Gahagan, C. Kwon, M. Hawley, V. Gopalan, J. M. Robinson, T. E. Mitchell, and Q. X. Jia, Integrated Ferroelectrics 25, 431 (1999).

2.      “Structural properties of Ba0.6Sr0.4TiO3 thin films on epitaxial RuO2 electrodes”, Q. X. Jia, C. Kwon, and P. Lu, Integrated Ferroelectrics 24, 57 (1999).

3.      “Spatial Distribution Analyses of Superconducting Transition Temperature in Epitaxial YBa2Cu3O7 Film Using Variable Temperature Scanning Laser Microscopy”, S. Seo, C. Kwon, B. H. Park, and Q. X. Jia, Mat. Res. Soc. Proc. 689, E8.22.1, (2002).

4.      “Imaging Transport Current Distribution in High Temperature Superconductors Using Room Temperature Scanning Laser Microscope”, C. Kwon, B. E. Klein, S. Seo, B. H. Park, and Q. X. Jia, Mat. Res. Soc. Proc. 689, E8.35.1, (2002).

5.      “Spatial Distribution Analyses of Critical Temperature in Epitaxial Y-Ba-Cu-O Film Using Variable Temperature Scanning Laser Microscopy”, C. Kwon, L. B. Wang, S. Seo, B.H. Park and Q.X. Jia, submitted to IEEE Transactions on Applied Superconductivity (2002).

6.      “Variable Temperature Scanning Laser Microscopy of Wider Width High Temperature Superconducting Films” L. B. Wang, M. B. Price, C. Kwon, and Q. X. Jia, submitted to IEEE Transactions on Applied Superconductivity (2002).

 

3)   Presentations - Invited Presentations

      These are the list of presentations after August 1999 (my appointment at CSULB).

1.      Presented a Colloquium at Department of Physics and Astronomy, CSULB (10/25/99) entitled “Fabrication and Characterization of Oxide Thin Films”.

2.      Invited presentation at the Department of Physics and Astronomy advisory council meeting, C. Kwon, “Scanning Laser Microscopy” (Nov. 16, 2000).

3.      Invited to give a presentation at Air Force Office of Scientific Research Program Review, C. Kwon, “HTS Study via Variable T Scanning Microscope”, University of California, San Diego, CA (Jan 5-6, 2001).

4.    Invited to give a presentation at Air Force Office of Scientific Research Program Review, C. Kwon, “Scanning Laser Microscopy of YBCO”, Stanford University, Palo Alto, CA (Oct. 22-23, 2001).+

 

4)   Presentations - Contributed Presentations

Thesis Supervised

        S. Seo, "Spatial Distribution Analysis of YBa2Cu3O7 Film" (2001). 

        B. E. Klein, "Room Temperature Scanning Laser Micrscopey" (2002).

Group Members

         Matt Price, Graduate Student

         Mike Frey, Graduate Student

         J. Rosales, Undergraduate Student

         K. Nguyen, Undergraduate Student

         J. M. Mahoney, Undergraduate Student

         A. Forrester, Undergraduate Student

         J. Young, Undergraduate Student

 

(Previous)

        Brian E. Klein, Newport Advanced Automation

         Christine S. Seo, Laboratory Assistant

Group Pictures

        Summer 2000 with GTE Summer Program students

         Fall 2000 during the advisory council meeting

         Fall 2002 after group meeting