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M. Hücker

Manipulating Competing Order with High Pressure. M. Hücker. Neutron Scattering Group (CMPMS). La 2-x Ba x CuO 4 Charge & Spin Stripes. Correlated Electron Systems ( Superconductivity, Magnetism, Electronic Order) High Temperature Superconductors Transition Metal Oxides Ferroelectrics

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M. Hücker

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  1. Manipulating Competing Order with High Pressure M. Hücker Neutron Scattering Group (CMPMS) La2-xBaxCuO4 Charge & Spin Stripes Correlated Electron Systems (Superconductivity, Magnetism, Electronic Order) • High Temperature Superconductors • Transition Metal Oxides • Ferroelectrics • Heavy Fermion Systems • Multiferroics

  2. 360° X-ray window Single-Crystal XRD at Low Temperature • Intensity ~10-6 off strongest Bragg Peak • Powder XRD not possible • E=100keV, 2•1011 photons/sec/mm2 BW5-HASYLAB 1 mm LBCO CGO

  3. High Pressure Beamline at NSLS-II • Single Crystal XRD • 4-Circle Diffractometer • Point Detector (2D Detector optional) • Low Temperature • Flux >1011–1012 photons/sec on Sample • DAC (MAC,Toroid) • Sample Centering • M. v. Zimmermann, HASYLAB • J. M. Tranquada, G. Xu, Neutron Scattering Group • Y. J. Kim, University of Toronto • B. Wells, University of Connecticut • D. J. Buttrey, University of Delaware • C. C. Kao, Z. Zhong, NSLS

  4. NSLS II Paris Edinburgh Cell Diamond Anvil Cell 100 mm3 30 GPa 25 kg low T not so easy 0.0001 mm3 100 GPa small beam sample position pressure inhomogeneous ISIS

  5. Pressure and Superconductivity Hg-1223 bulk LSCO bulk LSCO thin film buckled flat Bozovic et al. PRL 2002 Gao et al. PRB 1994 Yamada et al. JSSC 1989 Pressure: affects crystal structure and electronic band structure

  6. Competing order in LBCO single-crystal HXRD

  7. Charge Stripes under Pressure LTT structure Charge Stripes Do stripes survive in flat planes when x=1/8?

  8. Hole Crystallization in 2-Leg Ladder Sr14Cu24O41 Abbamonte et al. RSXS oxygen-K edge Blumberg et al. Science 2002 Rusydi et al. XRD: Zimmermann et al. PRB 2006

  9. Large Volume Pressure Cells for Single-Crystal X-ray Diffraction 4 GPa 3 GPa 7 GPa Mini Toroid Cell 1 cm 100keV 100keV NSLS/HASYLAB/NSLSII

  10. pressure cell: scattering/absorption pressure cell absorption: factor 10

  11. pressure sensor: CuGeO3 structural distortion at the spin Peierls transition at 14 K

  12. 100 keV beamline BW5 at HASYLAB, Hamburg E-range: 60-200 keV Crystal type: Si/TaSi2 (100”) Si1-xGex (15”–70”) Our Exp: 35” E-resolution: 600eV at 100keV Flux(photons/s): 2e11/mm2 @ 100keV (100mA, 4.5GeV) Spot size: 0.5mm x 0.5mm to 6mm x 6mm Detector: N2 cooled Ge det. Wiggler: 2Tesla, 17 periods

  13. Competing Order CePd2Si2 Lattice density (pressure) Charge density (doping)

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