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Unconventional charge order in a co-doped high-Tc superconductor
D Pelc1, M Vučković1, H-J Grafe2
1Faculty of Science, Department of Physics, University of Zagreb, Bijenička 32, Zagreb HR 10000, Croatia.
Nature Communications
|September 9, 2016
Summary
Researchers discovered a novel charge nematic phase in cuprate superconductors. This finding clarifies how charge-stripe order develops from the high-temperature state, distinct from the pseudogap.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Charge-stripe order is crucial in cuprate high-temperature superconductors.
- The emergence of charge-stripe order from the parent high-temperature state is not well understood due to competing phases and disorder.
Purpose of the Study:
- To investigate the unconventional ordered phase between charge-stripe order and the pseudogapped metal in La1.8-xEuxSrxCuO4.
- To elucidate the emergence process of charge-stripe order in cuprates.
Main Methods:
- Nuclear quadrupole resonance spectroscopy
- Nonlinear conductivity measurements
- Specific heat measurements
Main Results:
- Discovery of an unconventional ordered phase, a charge nematic, in La1.8-xEuxSrxCuO4.
- This charge nematic phase exhibits a sharp phase transition and exists in a dome-shaped region of the phase diagram.
- The charge nematic phase preserves translational symmetry and is distinct from the high-temperature pseudogap.
Conclusions:
- The study resolves the process of charge-stripe development in cuprates.
- A link is established between this nematic phase and other strongly correlated electronic materials exhibiting nematic order.
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