Reinvestigation of crystal symmetry and fluctuations in La2CuO4

Sapkota, Aashish; Sterling, T. C.; Lozano, P. M.; Li, Yangmu; Cao, Huibo; Garlea, Vasile O.; Reznik, D.; Li, Qiang; Zaliznyak, I. A.; Gu, G. D.; Tranquada, J. M.

doi:10.1103/physrevb.104.014304

Title: Reinvestigation of crystal symmetry and fluctuations in ${La}_{2} {CuO}_{4}$

Journal Article · Wed Jul 07 00:00:00 EDT 2021 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.104.014304· OSTI ID:1807943

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Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics
Univ. of Colorado, Boulder, CO (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics; Stony Brook Univ., NY (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division

New surprises continue to be revealed about ${La}_{2} {CuO}_{4}$ , the parent compound of the original cuprate superconductor. In this study 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 ${CuO}_{2}$ 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 ${CuO}_{6}$ 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.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; SC0006939; AC05-00OR22725

OSTI ID:: 1807943

Alternate ID(s):: OSTI ID: 1818650; OSTI ID: 1842478

Report Number(s):: BNL-221799-2021-JAAM; TRN: US2212864

Journal Information:: Physical Review B, Vol. 104, Issue 1; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Reinvestigation of crystal symmetry and fluctuations in La 2 CuO 4

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Title: Reinvestigation of crystal symmetry and fluctuations in ${La}_{2} {CuO}_{4}$