Publications

2014

  • John D. Budai, Jiawang Hong, Michael E. Manley, Eliot D. Specht, Chen W. Li, Jonathan Z. Tischler, Douglas L. Abernathy, Ayman H. Said, Bogdan M. Leu, Lynn A. Boatner, Robert J. McQueeney, and Olivier Delaire. Metallization of vanadium dioxide driven by large phonon entropy. Nature, doi:10.1038/nature13865.
  • Bogdan M. Leu, Mihai Sturza, Michael Y. Hu, David Gosztola, Volodymyr Baran, Thomas F. Fässler, and E. Ercan Alp. Vibrational dynamics of the host framework in Sn clathrates. Phys. Rev. B 90, 104304 (2014).
  • Jung-Fu Lin, Junjie Wu, Jie Zhu, Zhu Mao, Ayman H. Said, Bogdan M. Leu, Jinguang Cheng,Yoshiya Uwatoko, Changqing Jin, and Jianshi Zhou. Abnormal elastic and vibrational behaviors of magnetite at high pressures. Scientific Reports 4, 6282 (2014).
  • Shih-Chang Weng, Ruqing Xu, Ayman H. Said, Bogdan M. Leu, Yang Ding, Hawoong Hong, Xinyue Fang, M. Y. Chou, A. Bosak, P. Abbamonte, S. L. Cooper, E. Fradkin, S.-L. Chang, and T.-C. Chiang. Pressure-induced antiferrodistortive phase transition in SrTiO3: Common scaling of soft-mode with pressure and temperature. Europhysics Letters 107, 36006 (2014).

2013

  • H. Gretarsson, J. P. Clancy, Yogesh Sigh, P. Gegenwart, J. P. Hill, Jungho Kim, M. H. Upton, A. H. Said, D. Casa and Young-June Kim. Magnetic excitation spectrum of Na2IrO3 probed with resonant inelastic x-ray scattering. Phys. Rev. B 87, 220407(R) (2013).
  • Jungho Kim, Wei Ku, Chi-Cheng Lee, D. S. Ellis, B. K. Chou, A. H. Said, Y. Shvyd'ko and Young-June Kim. Spin-split conduction band in EuB6 and tuning of half-metallicity with external stimuli. Phys. Rev. B 87, 155104 (2013).
  • E. Blackburn, J. Chang, A. H. Said, B. M. Leu, Ruixing Liang, D. A. Bonn, W. N. Hardy, E. M. Forgan and S. M. Hayden. Inelastic x-ray study of phonon broadening and charge-density wave formation in ortho-II-ordered YBa2Cu3O6.54. Phys. Rev. B 88, 054506 (2013).
  • Yu. V. Shvyd'ko, J. P. Hill, C. A. Burns, D. S. Coburn, B. Brajuskovic, D. Casa, K. Goetze, T. Gog, R. Khachatryan, J.-H. Hill, C. N. Kodituwakku, M. Ramanathan, T. Roberts, A. Said, H. Sinn, D. Shu, S. Stoupin, M. Upton, M. Wieczorek and H. Yavas. MERIX - Next generation medium energy resolution inelastic X-ray scattering instrument at the APS. Journal of Electron Spectroscopy and Related Phenomena 188, 140 (2013).
  • Wei-Guo Yin, X. Liu, A. M. Tsvelik, M. P. M. Dean, M. H. Upton, Jungho Kim, D. Casa, A. Said, T. Gog, T. F. Qi, G. Cao and J. P. Hill. Ferromagnetic Exchange Anisotropy from Antiferromagnetic Superexchange in the Mixed 3d-5d Transition-Metal Compound Sr3CuIrO6. Phys. Rev. Lett. 111, 057202 (2013).
  • F. Weber, R. Hott, R. Heid, K.-P. Bohnen, S. Rosenkranz, J.-P Castellan, R. Osborn, A. H. Said, B. M. Leu and D. Reznik. Optical phonons and the soft mode in 2H-NbSe2. Phys. Rev. B 87, 245111 (2013).
  • S. E. Hahn, G. S. Tucker, J.-Q. Yan, A. H. Said, B. M. Leu, R. W. McCallum, E. E. Alp, T. A. Lograsso, R. J. McQueeney and B. N. Harmon. Magnetism dependent phonon anomaly in LaFeAsO observed via inelastic x-ray scattering. J. of Appl. Phys. 113, 17E153 (2013).
  • S. E. Hahn, G. S. Tucker, J.-Q. Yan, A. H. Said, B. M. Leu, R. W. McCallum, E. E. Alp, T. A. Lograsso, R. J. McQueeney and B. N. Harmon. Magnetism-dependent phonon anomaly in LaFeAsO observed via inelastic x-ray scattering. Phys. Rev. B 87, 104518 (2013).
  • H. Gretarsson, J. P. Clancy, X. Liu, J. P. Hill, Emil Bozin, Yogesh Singh, S. Manni, P. Gegenwart, Jungho Kim, A. H. Said, D. Casa, T. Gog, M. H. Upton, Heung-Sik Kim, J. Yu, Vamshi M. Katukuri, L. Hozoi, Jeroen van den Brink, and Young-June Kim. Crystal-Field Splitting and Correlation Effect on the Electronic Structure of A2IrO3. Phys. Rev. Lett., 110 076402 (2013).
  • T. Gog, D. M. Casa, A. H. Said, M. H. Upton, J. Kim, I. Kuzmenko, X. Huang and R. Khachatryan. Spherical analyzers and monochromators for resonant inelastic hard X-ray scattering: a compilation of crystals and reflections. Journal of Synchrotron Radiation, 20 74-79 (2013).

2012

  • A. Cunsolo. Onset of a transverse dynamics in the THz spectrum of water. Molecular Physics 111, 455 (2012).
  • Jungho Kim, A. H. Said, D. Casa, M. H. Upton, T. Gog, M. Daghofer, G. Jackeli, J. van den Brink, G. Khaliullin, and B. J. Kim. Large Spin-Wave Energy Gap in the Bilayer Iridate Sr3Ir2O7: Evidence for Enhanced Dipolar Interactions Near the mott Metal-Insulator Transition. Phys. Rev. Lett. 109, 157402 (2012).
  • X. Liu, Varnshi M. Katukuri, L. Hozoi, Wei-Guo Yin, M. P. M. Dean, M. H. Upton, Jungho Kim, D. Casa, A. Said, T. Gog, T. F. Qi, G. Cao, A. M. Tsvelik, Jeroen van den Brink, and J. P. Hill. Testing the Validity of the Strong Spin-Orbit-Coupling Limit for Octahedrally Coordinated Iridate Compounds in a Model System Sr3CuIrO6. Phys. Rev. Lett. 109, 157401 (2012).
  • I. Jarrige, T. Nomura, K. Ishii, H. Gretarsson, Y.-J. Kim, M. Upton, D. Casa, T. Gog, M. Ishikado, T. Fukuda, M. Yoshida, J. P. Hill, X. Liu, N. Hiraoka, K. D. Tseui, and S. Shamoto. Resonant inelastic x-ray scattering study of charge excitations in superconducting and nonsuperconducting PrFeAsO1-y. Phys. Rev. B 86, 115104 (2012).
  • Alessandro Cunsolo. On the absence of a positive sound dispersion in the THz dynamics of glycerol: an inelastic x-ray scattering study. Journal of Physics: Condensed Matter 24, 375104 (2012).
  • Yang Ding, Javier Fernandez-Rodriguez, Jungho Kim, Fangfei Li, Diego Casa, Mary Upton, Thomas Gog, Ho-kwang Mao, and Michel van Veenendaal. Spin-ordering mediated orbital hybridization in CoO at high pressures. Phys. Rev. B 86, 094107 (2012).
  • A. Cunsolo, C. N. Kodituwakku, F. Bencivenga, M. Frontzek, B. M. Leu and A. H. Said. Transverse dynamics of water across the melting point: A parallel neutron and x-ray inelastic scattering study. Phys. Rev. B 85, 174305 (2012).
  • Jungho Kim, D. Casa, M. H. Upton, T. Gog, Young-June Kim, J. F. Mitchell, M. van Veenendaal, M. Daghofer, J. van den Brink, G. Khaliullin, and B. J. Kim. Magnetic Excitation Spectra of Sr2IrO4 Probed by Resonant Inelastic X-Ray Scattering: Establishing Links to Cuprate Superconductors. Phys. Rev. Lett. 108, 177003 (2012).
  • E. Mamontov, A. De Fancesco, F. Formisano, A. Laloni, L. Sani, B. M. Leu, A. H. Said, and A. I Kolesnikov. Water dynamics in lithium chloride aqueous solution probed by Brillouin neutron and x-ray scattering. J. Phys.: Condens. Matter. 24, 064102 (2012).
  • M. E. Manley, J. R. Jeffries, A. H. Said, C. A. Marianette, H. Cynn, B. M. Leu, and M. A. Wall. Measurement of the phonon density of states of PuO2(+2% Ga): A critical test of theory. Phys. Rev. B 85, 132301 (2012).

2011

  • Xuan Gao, Clement Burns, Diego Casa, Mary Upton, Thomas Gog, Jungho Kim, and Chengyang Li. Development of a graphite polarization analyzer for resonant inelastic x-ray scattering. Rev. Sci. Instrum. 82, 113108 (2011).
  • Jungho Kim, Yuri Shvyd'ko, and S. G. Ovchinnikov. Charge transfer and Mott-Hubbard excitations in FeBO3: An Fe K-edge resonant inelastic x-ray scattering study. Phys. Rev. B 83, 235109 (2011).
  • F. Weber, S. Rosenkranz, J.-P. Castellan, R. Osborn, R. Hott, R. Heid, K.-P. Bohnen, T. Egami, A. H. Said, and D. Reznik. Extended phonon collapse and the origin of the charge density wave in 2H-NbSe2. Phys. Rev. Lett. 107, 107403 (2011).
  • A. Cunsolo, B. M. Leu, A. H. Said, and Y. Q. Cai. Structural and microscopic relaxations in glycerol: An inelastic x-ray scattering study. J. Chem. Phys. 134, 184502 (2011).
  • A. H. Said, H. Sinn, and R. Divan. New developments in fabrication of high-energy-resolution analyzers for inelastic X-ray spectroscopy. J. Synchrotron Rad. 18, 492 (2011).
  • Michel van Veenendaal, Xiaosong Liu, Matthew H. Carpenter, and Stephen P. Cramer. Observation of dd excitations in NiO and NiCl2 using K-edge resonant inelastic x-ray scattering. Phys. Rev. B 83, 045101 (2011).
  • Stanislav Stoupin and Yuri V. Shvyd'ko. Ultraprecise studies of the thermal expansion coefficient of diamond using backscattering x-ray diffraction. Phys. Rev. B 83, 104102 (2011).
  • T. S. Toellner, A. Altas and A. H. Said. Six-reflection meV-monochromator for synchrotron radiation. J. Synchrotron Rad. 18, 605 (2011).

2010

  • Hawoong Hong, Mary Upton, Ayman H. Said, Hyun-Sook Lee, Dong-Jin Jang, Sung-Ik Lee, Ruqing Xu, and T.-C. Chiang. Phonon dispersions and anomalies of MgCNi3 single-crystal superconductors. Phys. Rev. B 82, 134535 (2010).
  • M. H. Upton, T. R. Forrest, A. C. Walters, C. A. Howard, M. Ellerby, A. H. Said and D. F. McMorrow. Phonons and superconductivity in YbC6 and related compounds. Phys. Rev. B 82, 134515 (2010).
  • Daniele Antonangeli, Daniel L. Farber, Ayman H. Said, Laura Robin Benedetti, Chantel M. Aracne, Alexander Landa, Per Söderlind, and John E. Klepeis. Shear softening in tantalum at megabar pressures. Phys. Rev. B. 82, 132101 (2010).
  • Stanislav Stoupin, Frank Lenkszus, Robert Laird, Kurt Goetze, Kwang-Je Kim, and Yuri Shvyd’ko. Nanoradian angular stabilization of x-ray optical components. Rev. Sci. Instrum. 81, 055108 (2010).
  • X. Wang, C. A. Burns, A. H. Said, C. N. Kodituwakku, Y. V. Shvydko, D. Casa, T. Gog, and P. M. Platzman. Evolution of a strongly correlated liquid with electronic density. Phys. Rev. B 81, 075104 (2010).
  • D. S. Ellis, Jungho Kim, J. P. Hill, S. Wakimoto, R. J. Birgeneau, Y. Shvyd'ko, D. Casa, K. Ishii, K. Ikeuchi, A. Paramekanti, and Young-June Kim. Magnetic nature of the 500 meV peak in La2-xSrxCuO4 observed with resonant inelastic x-ray scattering at the Cu K-edge. Phys. Rev. B 81, 085124 (2010).
  • Yu. Shvyd'ko, S. Stoupin, A. Cunsolo, A. Said, S. Huang. High-Reflectivity High-Resolution X-Ray Crystal Optics with Diamonds. Nat. Phys. 6, (3) 196 (2010).
  • S. Stoupin and Y. Shvyd'ko. Thermal Expansion of Diamond at Low Temperatures. Phys. Rev. Lett. 104, 085901 (2010).

2009

  • S. Wakimoto, H. Kimura, K. Ishii, IK. Ikeuchi, T. Adachi, M. Fujita, K. Kakurai, Y. Koike, J. Mizuki, Y. Noda, K. Yamada, A. H. Said, and Yu. Shvyd'ko. Charge Excitations in the Strip-Ordered La5/3Sr1/3NiO4 Superconducting Compounds. Phys. Rev. Lett. 102, 157001 (2009).
  • M. E. Manley, A. H. Said, M. J. Fluss, M. Wall, J. C. Lashley, A. Alatas, K. T. Moore, and Yu. Shvyd'ko. Phonon density of states of alpha- and delta-plutonium by inelastic x-ray scattering. Phys. Rev. B 79, 052301 (2009).
  • D. Reznik, K. Lokshin, D. C. Mitchell, D. Parshall, W. Dmowski, D. Lamago, R. Heid, K. -P. Bohnen A. S. Sefat, M. A. McGuire, B. C. Sales, D. G. Mandrus, A. Subedi, D. J. Sing, A. Alatas, M. H. Upton, A. H. Said, A. Cunsolo, Yu. Shyvd'ko, and T. Egami. Phonons in doped and updoped BaFe2As2 investigated by inelastic x-ray scattering. Phys. Rev. B 80, 214534 (2009).
  • T. Gog, G. T. Seidler, D. M. Casa, M. H. Upton, Jungho Kim, S. Stoupin, K. P Nagle, M. Balasubramanian, R. A. Gordon, T. T. Fister, S. M. Heald, T. Toellner, J. P. Hill, D. S. Coburn, Young-June Kim, A. H. Said, E. E. Alp, W. Sutrhahn, H. Yavas, C. A. Burns, and H. Sinn. Momentum-resolved Resonant and Nonresonant Inelastic X-ray scattering at the Advanced Photon Source. Synchrotron Radiation News 22, 12 (2009).

2008

  • Dazhi Liu, Xiang-qiang Chu, Marco Lagi, Yang Zhang, Emiliano Fratini, Piero Baglioni, Ahmet Alatas, Ercan Alp, and Sow-Hsin Chen. Studies of phononlike low-energy excitations of protein molecules. Phys. Rev. Lett. 101, 135501 (2008).