We present time-of-flight neutron-scattering measurements on single crystals of La2-xBaxCuO4 (LBCO) with 0 ≤ x ≤ 0.095 and La2-xSrxCuO4 (LSCO) with x = 0.08 and 0.11. This range of dopings spans much of the phase diagram relevant to high temperature cuprate superconductivity, ranging from insulating, three dimensional commensurate long range antiferromagnetic order for x ≤ 0.02 to two dimensional (2D) incommensurate antiferromagnetism co-existing with superconductivity for x ≥ 0.05. Previous work on lightly doped LBCO with x = 0.035 showed a clear resonant enhancement of the inelastic scattering coincident with the low energy crossings of the highly dispersive spin excitations and quasi-2D optic phonons. The present work extends these measurements across the phase diagram and shows this enhancement to be a common feature to this family of layered quantum magnets. Furthermore we show that the low temperature, low energy magnetic spectral weight is substantially larger for samples with non-superconducting ground states relative to any of the samples with superconducting ground states. Lastly spin gaps, suppression of low energy magnetic spectral weight, are observed in both superconducting LBCO and LSCO samples, consistent with previous observations for superconducting LSCO
Wagman, J. J., et al. "Neutron scattering studies of spin-phonon hybridization and superconducting spin gaps in the high temperature superconductor La<sub>2-x</sub>(Sr;Ba)<sub>x</sub>CuO<sub>4</sub>." Physical Review B, vol. 93, no. 9, Mar. 2016. https://doi.org/10.1103/PhysRevB.93.094416
Wagman, J. J., Carlo, Jeremy P., Gaudet, J., Van Gastel, G. J., Abernathy, Douglas L., Stone, Matthew B., Granroth, Garrett E., Kolesnikov, Alexander I., Savici, Andrei T., Kim, Young -June, Zhang, H., Ellis, D., Zhao, Yang, Clark, L., Kallin, A. B., Mazurek, E., Dabkowska, H. A., & Gaulin, Bruce D. (2016). Neutron scattering studies of spin-phonon hybridization and superconducting spin gaps in the high temperature superconductor La<sub>2-x</sub>(Sr;Ba)<sub>x</sub>CuO<sub>4</sub>. Physical Review B, 93(9). https://doi.org/10.1103/PhysRevB.93.094416
Wagman, J. J., Carlo, Jeremy P., Gaudet, J., et al., "Neutron scattering studies of spin-phonon hybridization and superconducting spin gaps in the high temperature superconductor La<sub>2-x</sub>(Sr;Ba)<sub>x</sub>CuO<sub>4</sub>," Physical Review B 93, no. 9 (2016), https://doi.org/10.1103/PhysRevB.93.094416
@article{osti_1244192,
author = {Wagman, J. J. and Carlo, Jeremy P. and Gaudet, J. and Van Gastel, G. J. and Abernathy, Douglas L. and Stone, Matthew B. and Granroth, Garrett E. and Kolesnikov, Alexander I. and Savici, Andrei T. and Kim, Young -June and others},
title = {Neutron scattering studies of spin-phonon hybridization and superconducting spin gaps in the high temperature superconductor La<sub>2-x</sub>(Sr;Ba)<sub>x</sub>CuO<sub>4</sub>},
annote = {We present time-of-flight neutron-scattering measurements on single crystals of La2-xBaxCuO4 (LBCO) with 0 ≤ x ≤ 0.095 and La2-xSrxCuO4 (LSCO) with x = 0.08 and 0.11. This range of dopings spans much of the phase diagram relevant to high temperature cuprate superconductivity, ranging from insulating, three dimensional commensurate long range antiferromagnetic order for x ≤ 0.02 to two dimensional (2D) incommensurate antiferromagnetism co-existing with superconductivity for x ≥ 0.05. Previous work on lightly doped LBCO with x = 0.035 showed a clear resonant enhancement of the inelastic scattering coincident with the low energy crossings of the highly dispersive spin excitations and quasi-2D optic phonons. The present work extends these measurements across the phase diagram and shows this enhancement to be a common feature to this family of layered quantum magnets. Furthermore we show that the low temperature, low energy magnetic spectral weight is substantially larger for samples with non-superconducting ground states relative to any of the samples with superconducting ground states. Lastly spin gaps, suppression of low energy magnetic spectral weight, are observed in both superconducting LBCO and LSCO samples, consistent with previous observations for superconducting LSCO},
doi = {10.1103/PhysRevB.93.094416},
url = {https://www.osti.gov/biblio/1244192},
journal = {Physical Review B},
issn = {ISSN 2469-9950},
number = {9},
volume = {93},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2016},
month = {03}}
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 764https://doi.org/10.1016/j.nima.2014.03.068
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 764https://doi.org/10.1016/j.nima.2014.07.029
LECTURES ON THE PHYSICS OF STRONGLY CORRELATED SYSTEMS XVII: Seventeenth Training Course in the Physics of Strongly Correlated Systems, AIP Conference Proceedingshttps://doi.org/10.1063/1.4818402