Local Noncentrosymmetric Structure of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+y} by X-ray Magnetic Circular Dichroism at Cu K-Edge XANES

Journal Article · Thu Mar 15 00:00:00 EDT 2018 · Journal of Superconductivity and Novel Magnetism

DOI:https://doi.org/10.1007/S10948-017-4418-5· OSTI ID:22777019

Ivanov, Valentin G.; Menushenkov, Alexey P. ^[1]; Wilhelm, Fabrice; Rogalev, Andrei ^[2]; Puri, Alessandro ^[3]; Joseph, Boby ^[4]; Xu, Wei ^[5]; Marcelli, Augusto ^[6]; Bianconi, Antonio ^[1]

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1. National Research Nuclear University Moscow Engineering Physics Institute (MEPhI) (Russian Federation)
2. European Synchrotron Radiation Facility (ESRF) (France)
3. CNR-IOM-OGG, c/o ESRF LISA CRG (France)
4. Sincrotrone Elettra (Italy)
5. Chinese Academy of Sciences, Beijing Synchrotron Radiation Facility, Institute of High Energy Physics (China)
6. Istituto Nazionale di Fisica Nucleare Laboratori Nazionali di Frascati (Italy)

The two-dimensional Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+y} (Bi2212), the most studied prototype cuprate superconductor, is a lamellar system made of a stack of two-dimensional corrugated CuO{sub 2} bilayers separated by Bi{sub 2}O{sub 2+y}Sr{sub 2} O{sub 2} layers. While the large majority of theories, proposed to interpret unconventional high T{sub c} superconductivity in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+y}, assume a centrosymmetric tetragonal CuO{sub 2} lattice for the [CuO{sub 2}]Ca[CuO{sub 2}] bilayer, here, we report new compelling results providing evidence for local noncentrosymmetric symmetry at the Cu atom. We have measured polarized Cu K-edge XANES (X-ray absorption near-edge structure) and the K-edge X-ray magnetic circular dichroism (XMCD) of a Bi2212 single-crystal near-optimum doping. The Cu K-edge XMCD signal was measured at ID12 beamline of ESRF with the k-vector of X-ray beam parallel to c-axis, i.e., with the electric field of X-ray beam E//ab, using a 17-T magnetic field parallel to the c-axis of a Bi2212 single crystal. Numerical simulations of the XMCD signal of Bi2212 by multiple scattering theory have shown agreement with the experimental XMCD signal only for the local structure with noncentrosymmetric Bb2b space group of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+y}.

• OSTI ID: 22777019
• Journal Information: Journal of Superconductivity and Novel Magnetism, Vol. 31, Issue 3; Other Information: Copyright (c) 2018 Springer Science+Business Media, LLC, part of Springer Nature; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); ISSN 1557-1939
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTROSCOPY
BISMUTH OXIDES
CALCIUM OXIDES
COMPUTERIZED SIMULATION
COPPER
COPPER OXIDES
ELECTRIC FIELDS
HIGH-TC SUPERCONDUCTORS
MAGNETIC CIRCULAR DICHROISM
MAGNETIC FIELDS
MONOCRYSTALS
MULTIPLE SCATTERING
SPACE GROUPS
STRONTIUM OXIDES
TETRAGONAL LATTICES
TWO-DIMENSIONAL SYSTEMS
X RADIATION
X-RAY SPECTROSCOPY