Reinvestigation of crystal symmetry and fluctuations in La2CuO4
Source abstract
Abstract
New surprises continue to be revealed about ${\mathrm{La}}2{\mathrm{CuO}}4$, the parent compound of the original cuprate superconductor. Here we present neutron scattering evidence that the structural symmetry is lower than commonly assumed. The static distortion results in anisotropic Cu-O bonds within the ${\mathrm{CuO}}2$ planes; such anisotropy is relevant to pinning charge stripes in hole-doped samples. Associated with the extra structural modulation is a soft phonon mode. If this phonon were to soften completely, the resulting change in ${\mathrm{CuO}}6$ octahedral tilts would lead to weak ferromagnetism. Hence, we suggest that this mode may be the ``chiral'' phonon inferred from recent studies of the thermal Hall effect. We also note the absence of interaction between the antiferromagnetic spin waves and low-energy optical phonons, in contrast to what is observed in hole-doped samples.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Physics of Superconductivity and Magnetism · Advanced Condensed Matter Physics · Magnetic and transport properties of perovskites and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Condensed Matter Physics & Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
Department of Physics, University of Colorado at Boulder, Boulder, Colorado 80309, USA
Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794-3800, USA
Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
Center for Experiments on Quantum Materials, University of Colorado at Boulder, Boulder, Colorado 80309, USA
Funding
U.S. Department of Energy · Basic Energy Sciences · Division of Materials Sciences and Engineering · Oak Ridge National Laboratory
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