University of Minnesota
School of Physics & Astronomy

Condensed Matter Sack Lunch Seminar

Friday, November 3rd 2017
12:20 pm:
Speaker: Biqiong Yu, University of Minnesota
Subject: Charge-Density-Wave Correlations and Phonon Anomalies in Cuprates

The recent discovery of CDW order in hole- and electron-doped cuprates has attracted much attention, as there appears to be a close connection between superconductivity and charge-order, and possibly also the mysterious pseudogap phenomenon. A crucial question regarding the nature of the CDW phenomenon in the hole-doped cuprates is whether the observed short-range order is static or associated with dynamic spectral features. We studied the model high-Tc superconductor HgBa2CuO4+δ (Hg1201) via resonant inelastic X-ray scattering (RIXS) at the L3-edge of copper. We measured a single crystal of Hg1201 with Tc = 69K (hole concentration p = 0.083) and constructed energy-momentum RIXS intensity maps, with focus on the CDW momentum transfer, qCDW. The connection between CDW and other low energy excitations (magnons, phonons) will also be discussed.

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