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Uniaxial pressure control of competing orders in a high temperature superconductor

Le Tacon, M.

Abstract (englisch):
External control of electronic phases in correlated-electron materials is a long-standing challenge of condensed-matter research. Layered cuprates exhibit antiferromagnetic, charge-density-wave (CDW), and high-temperature superconducting ground states which can be tuned by doping and external magnetic fields. However, disorder generated by lattice defects and randomly pinned magnetic vortices greatly complicates the interpretation of these experiments. Here, we report a high-resolution inelastic x-ray scattering (IXS) study of the high-temperature superconductor YBa2Cu3O6.67 under hydrostatic [1] and uniaxial [2] stress. We show that the former rapidly suppresses the CDW, while the second can induce a three-dimensional long-range-ordered CDW state by compressing the sample along the a-axis, in the absence of magnetic fields. The amplitude of the CDW is strongly suppressed below the superconducting transition temperature, indicating strong thermodynamic competition with superconductivity. We also show that the transition is driven by the complete softening of an optical phonon mode.
Non-resonant scattering can however not be used to monitor the evolution of the CDW with stress along the b-axis, due to a strong background arising from CuO chains superstructures. ... mehr

Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Publikationstyp Vortrag
Publikationsdatum 22.01.2020
Sprache Englisch
Identifikator KITopen-ID: 1000105657
HGF-Programm 43.21.01 (POF III, LK 01)
Quantum Correlations in Condensed Matter
Veranstaltung Today´s EM-IQM Seminar (2020), Berlin, Deutschland, 22.01.2020 – 23.01.2020
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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