Guangyong Xu

Address: Physics Department

Brookhaven National Laboratory

Upton, NY 11973-5000

Phone: (631) 344-2609

Fax: (631) 344-2918

E-mail: gxu@bnl.gov

Educational Background: B.A. in physics, Peking University, 1994

Ph.D. in Physics, The Johns Hopkins University, 1999, Thesis: "Spin Correlations and Impurities in 1-D gapped Spin Systems";

Advisor: Collin Broholm

1999-2002: Postdoctoral Research Associate, University of Chicago

2002-2004: Assistant Physicist, Brookhaven National Laboratory

2004-present Associate Physicist, Brookhaven National Laboratory

Member, American Physical Society

Member, Neutron Scattering Society of America

1. Guangyong Xu, C. Broholm, D. H. Reich, and M. A. Adams, "Triplet Waves in a Spin Liquid", Phys. Rev. Lett.  84, 4465 (2000).

2. Guangyong Xu, G. Aepplu, C. Broholm, J. F. DiTusa, P. Bisher, T. Ito, K. Oka, H. Takagi, and M. Treacy, "Holes in a quantum spin liquid", Science, 289, 419 (2000).

3. Guangyong Xu, X. Su, C. Stagarescue, D. E. Eastman, B. Lai, Z. Cai, and C.-K. Hu, "Quantitative metrology study of Cu/SiO₂ interconnect structures using fluorescence x-ray microscopy", Appl. Phys. Lett. 78, 820 (2001).

4. D. E. Eastman, C. Stagarescue, Guangyong Xu, B. Lai, Z. Cai, P. M. Mooney, and J. L. Jordan-Sweet, "Observation of Columnar Microstructure in Step-Graded Si_1-xGe_x/Si Films Using High-Resolution X-Ray Microdiffraction", Phys. Rev. Lett. 88,156101 (2002).

5. M. Kenzelmann, Guangyong Xu, I. A. Zaliznyak, C. Broholm, J. F. DiTusa, G. Aeppli, T. Ito, K. Oka, and H. Takagi, "Structure of End States for a Haldane Spin Chain", Phys. Rev. Lett. 90, 087202 (2003).

6. Guangyong Xu, Z. Zhong, Y. Bing, Z.-G. Ye, C. Stock, and G. Shirane, "Ground State of  Relaxor Ferroelectric Pb(Zn_1/3Nb_2/3)O₃", Phys. Rev. B  67, 104102 (2003).

7. Guangyong Xu, D. E. Eastman, B. Lai, Z. Cai, I. McNulty, I. C. Noyan, and C.-K. Hu, "Metrology Studies of Submicron Cu/SiO₂ Interconnects using Fluorescence and Transmission X-ray Microscopies", J. Appl. Phys. 94, 6040 (2003).

8. Guangyong Xu, D. Viehland, J. F. Li, P. M. Gehring, and G. Shirane, "Evidence of decoupled lattice distortion and ferroelectric polarization in the relaxor system PMN-xPT", Phys. Rev. B  68, 212410 (2003).

9. Guangyong Xu, G. Shirane, J. R. D. Copley and P. M. Gehring, "A Neutron Elastic Diffuse Scattering Study of PMN", Phys. Rev. B  69, 064112 (2004).

10. Guangyong Xu, H. Hiraka, K. Ohwada, and G. Shirane, "Dual structures in PZN-xPT ferroelectric relaxors", Appl. Phys. Lett. 84,  3975 (2004).

11. J. M. Tranquada, H. Woo, T. G. Perring, H. Goka, G. D. Gu, Guangyong Xu, M. Fujita, and K. Yamada, "Quantum Magnetic Excitations from Stripes in Copper-Oxide Superconductors", Nature 429, 534 (2004).

12. Guangyong Xu, Z. Zhong, Y. Bing, Z.-G. Ye, C. Stock, and G. Shirane, "An Anomalous Phase in the Relaxor Ferroelectric
PZN", Phys. Rev. B 70, 064107 (2004).

13. Feiming Bai, Naigang Wang, Jiefang Li, D. Viehland, P. M. Gehring, Guangyong Xu, and G. Shirane, "X-ray and neutron diffraction investigations of the structural phase transformation sequence under electric field in 0.7PMN-0.3PT crystal", J. Appl. Phys. 96, 1620 (2004).

14. Guangyong Xu, P. M. Gehring, V. J. Ghosh, and G. Shirane, "High q-resolution neutron scattering technique using triple-axis spectrometers", Acta. Crystal. A 60, 598 (2004).

15. H. Hiraka, S.-H. Lee, P. M. Gehing, Guangyong Xu, and G. Shirane, "Cold neutron scattering study on diffuse and phonon excitations in the relaxor PMN", in press for Phys. Rev. B.

16. Guangyong Xu, H. Hiraka, Z. Zhong, and G. Shirane, "Three dimensional mapping of diffuse scattering in PZN-xPT", in press for Phys. Rev. B.