Unconventional charge order in a co-doped high-Tc superconductor

D. Pelc (), M. Vučković, H. -J. Grafe, S. -H. Baek and M. Požek ()
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D. Pelc: Faculty of Science, University of Zagreb
M. Vučković: Faculty of Science, University of Zagreb
H. -J. Grafe: IFW Dresden, Institute for Solid State Research
S. -H. Baek: IFW Dresden, Institute for Solid State Research
M. Požek: Faculty of Science, University of Zagreb

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Charge-stripe order has recently been established as an important aspect of cuprate high-Tc superconductors. However, owing to the complex interplay between competing phases and the influence of disorder, it is unclear how it emerges from the parent high-temperature state. Here we report on the discovery of an unconventional ordered phase between charge-stripe order and (pseudogapped) metal in the cuprate La1.8−xEu0.2SrxCuO4. We use three complementary experiments—nuclear quadrupole resonance, nonlinear conductivity and specific heat—to demonstrate that the order appears through a sharp phase transition and exists in a dome-shaped region of the phase diagram. Our results imply that the new phase is a state, which preserves translational symmetry: a charge nematic. We thus resolve the process of charge-stripe development in cuprates, show that this nematic phase is distinct from high-temperature pseudogap and establish a link with other strongly correlated electronic materials with prominent nematic order.

Date: 2016
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DOI: 10.1038/ncomms12775

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