Selected Publications:

1. Pulsed Laser Deposition of YBa₂Cu₃O_7-x for Coated Conductor Applications: Current Status and Cost Issues, H, M. Christen, submitted Oct. 2001; published in “Next Generation High Temperature Superconducting Wires,” A. Goyal (Ed.), Kluwer Academic/Plenum Publishers (2005), p. 59-79.
2. Recent Advances in Pulsed-Laser Deposition of Complex Oxides, H. M. Christen and G. Eres, J. Phys.: Condens. Matter 20 (2008) 000000 (16pp).
3. Effect of Strain on Structure and Charge Order Transitions in Epitaxial
   Bi_0.4Ca_0.6MnO₃ Films on Perovskite (001) and (011) Substrates, Dae Ho Kim, Hans M. Christen, Maria Varela, Ho Nyung Lee, and Douglas H. Lowndes, Applied Physics Letters 88, 202503 (2006).
4. Effect of Epitaxial Strain on Ferroelectric Polarization in Multiferroic
   BiFeO₃ Films, Dae Ho Kim, Ho Nyung Lee, Michael D. Biegalski, and Hans M. Christen, Applied Physics Letters 92, 012911 (2008).
5. Evolution of Transport and Magnetic Properties Near the Ferromagnetic Quantum Critical Point in the Series Ca_xSr_1-xRuO₃, P. Khalifah, I. Ohkubo, H. M. Christen, and D. G. Mandrus, Physical Review B 70, 134426 (2004).
6. Spectroscopic Imaging of Single AtomsWithin a Bulk Solid, M. Varela, S. D. Findlay, A. R. Lupini, H. M. Christen, A. Y. Borisevich, N. Dellby, O. L. Krivanek, P. D. Nellist, M. P. Oxley, L. J. Allen, S. J. Pennycook, Physical Review Letters, Vol. 92, No. 9, (2004).
7. The Effect of Size, Strain and Long-Range Interactions on Ferroelectric Phase Transitions in KTaO₃/KNbO₃ Superlattices Study by X-ray, EXAFS, and Dielectric Measurements, H. M. Christen, K. S. Harshavardhan, M. F. Chisholm, E. D. Specht, J. D. Budai, D. P. Horton, L. A. Boatner, I. J. Pickering, Journal of Electroceramics 4:2/3, 279-287, 2000.
8. A Laser-Deposition Approach to Compositional-Spread Discovery of Materials on Conventional Sample Sizes, Hans M Christen, Isao Ohkubo, Christopher M. Rouleau, Gerald E. Jellison Jr, Alex A. Puretzky, David B. Geohegan
   and Douglas H. Lowndes, Meas. Sci. Technol. 16 (2005) 21–31.
9. Long-Range Ferroelectric Interactions in KTaO₃/KNbO₃ Superlattice
   Structures, H.-M. Christen, E. D. Specht, D. P. Norton, M. F. Chisholm, and L. A. Boatnerb), Applied Phy. Let. Vol. 72, No. 20 (1998).
10. Pulsed Electron Deposition of Fluorine-Based Precursors for YBa₂Cu₃O_7-x-Coated Conductors, H. M. Christen, D. F. Lee, F. A. List, S. W. Cook, K. J. Leonard, L. Heatherly, P.M. Martin, M. Paranthaman, A. Goyal and C. M. Rouleau, Supercond. Sci. Technol. 18 (2005) 1168–1175.
11. Suppressed Dependence of Polarization on Epitaxial Strain in Highly Polar Ferroelectrics, Ho Nyung Lee, Serge M. Nakhmanson, Matthew F. Chisholm, Hans M. Christen, Karin M. Rabe, and David Vanderbilt, Phy. Review Ltrs, PRL 98, 217602 (2007).
12. An Improved Continuous Compositional-Spread Technique Based on Pulsed-Laser Deposition and Applicable to Large Substrate Areas, H. M. Christen, C. M. Rouleau, I. Ohkubo, H. Y. Zhai, H. N. Lee, S. Sathyamurthy, and D. H. Lowndes, Review of Scientific Instruments, Vol. 74, No. 9, (2003).
13. High-Throughput Growth Temperature Optimization of Ferroelectric Sr_xBa_1-xNb₂O₆ Epitaxial Thin Films Using a Temperature Gradient Method, I. Ohkubo, H. M. Christen, Sergei V. Kalinin, G. E. Jellison, Jr., C. M. Rouleau, and D. H. Lowndes, Applied Phyics Ltrs, Vol. 84, No. 8 (2004).
14. Dielectric and Optical Properties of Epitaxial Rare-Earth Scandate Films and
    Their Crystallization Behavior, H. M. Christen, G. E. Jellison, Jr., Ohkubo, S. Huang, M. E. Reeves, E. Cicerrella, J. L. Freeouf, Y. Jia, D. G. Schlom, Applied Phyics Ltrs, Vol. 88, 262906 (2006).
15. Thermal Stability of Epitaxial SrRuO3 Films as a Function of Oxygen Pressure, Ho Nyung Lee, Hans M. Christen, Matthew F. Chisholm, Christopher M. Rouleau,
    and Douglas H. Lowndes, Applied Phyics Ltrs, Vol. 84, No. 20 (2004).
16. Ferroelectric and Antiferroelectric Coupling in Superlattices of Paraelectric Perovskites at Room Temperature, Hans M. Christen, Eliot D. Specht, Sherwood S. Silliman, K. S. Harshavardhan, Physical Review B 68, 020101(R) (2003).
17. Strong Polarization Enhancement in Asymmetric Three-Component Ferroelectric Superlattices, Ho Nung Lee, Hans . Christen, Matthew F. Chisholm, Christopher M. Rouleau, and Douglas H. Lowndes, Nature, Vol. 433, (2005).
18. Rapid Growth of Long, Vertically Aligned Carbon Nanotubes through Efficient Catalyst Optimization Using Metal Film Gradients, H. M. Christen, A. A. Puretzky, H. Cui, K. Belay, P. H. Fleming, D. B. Geohegan, D. H. Lowndes, Nano Letters, Vol. 4, No. 1939-1942 (2004).