Infrared linear dichroism resonance in over-, under-, and optimally-doped cuprate superconductors
Abstract
We report systematic measurements on epitaxial thin films of high-temperature cuprate superconductors using polarization sensitive measurements. We measure the complex Faraday angle at zero magnetic field as a function of temperature (10-300K), energy (3 to 2330 meV), and doping. We observe a Faraday rotation signal, which shows sample orientation dependence that can be best associated with linear dichroism (LD). The LD signal may be due to nematic charge ordering in the cuprates, as has been observed in dc Hall transport measurements. The Faraday rotation signal, as large as 22 mrad near 400 meV, is strongest in under-doped films even at 300K and it shows strong frequency dependence as well as doping dependence, which provides important clues for resolving the microscopic mechanism responsible for the anisotropy.
This work is supported by NSF-DMR1410599, NSERC, CFI-OIT and The Canadian Institute for Advanced Research.- Publication:
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APS March Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..MARF08005S