Unconventional charge order in a co-doped high-Tc superconductor (CROSBI ID 230955)
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Pelc, Damjan ; Vučković, Marija ; Grafe, Hans-Joachim ; Baek, Seung-Ho ; Požek, Miroslav
engleski
Unconventional charge order in a co-doped high-Tc superconductor
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.
high temperature superconductivity ; charge order ; stripes ; nematic phase
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