Nematicity and charge density wave order in stripe ordered cuprates probed via resonant x-ray scattering

          @misc{ pirsa_PIRSA:15070069,
            doi = {10.48660/15070069},
            url = {https://pirsa.org/15070069},
            author = {Hawthorn, David},
            keywords = {Condensed Matter, Quantum Gravity, Quantum Information},
            language = {en},
            title = {Nematicity and charge density wave order in stripe ordered cuprates probed via resonant x-ray scattering },
            publisher = {Perimeter Institute},
            year = {2015},
            month = {jul},
            note = {PIRSA:15070069 see, \url{https://pirsa.org}}
          }
          

Abstract

In underdoped cuprate superconductors, a rich competition occurs between superconductivity and charge density wave order (CDW). Under debate, however, is whether rotational symmetry breaking (nematicity) also plays a central role -- whether it occurs intrinsically and generically or merely as a consequence of other orders. Here we employ resonant x-ray scattering in stripe-ordered (La,X)2CuO4 to probe the relationship between electronic nematicity of the Cu 3d orbitals, structural orthorhombicity of the (La,X)2O4 layers and CDW order. We find distinct temperature dependences of the structural orthorhombicity and the electronic nematicity, with the electronic nematicity, but no structural orthorhombicity enhancement below the onset of CDW order. These results indicate electronic nematicity is an order parameter that is distinct from a purely structural order parameter in underdoped cuprates.