Phenomenological theory of spin excitations in La- and Y-based cuprates

2007/04/08 by Tao Zhou, T. Zhou, Z. D. Wang · 5 citations
Physics and Astronomy · #Condensed matter physics #Cuprate #Magnetic confinement fusion research #Magnetic properties of thin films #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spin (aerodynamics) #Superconductivity #Thermodynamics #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.76.094510

published in Physical Review B 76(9) (American Physical Society) · 8 pages, 8 figures

arxiv created 2007/04/08 · openalex publication_date 2007/09/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Motivated by recent inelastic neutron scattering experiments on La-based cuprates and based on the fermiology theories, we study the spin susceptibility for La-based (e.g., La_2\ensuremath-xSr_xCuO₄) and Y-based (e.g., YBa₂Cu₃O_y) cuprates, respectively. The spin excitation in YBa₂Cu₃O_y is dominated by a sharp resonance peak at the frequency 40\phantom\rule0.3em0exmeV in the superconducting state. Below and above the resonance frequency, the incommensurate (IC) peaks develop and the intensity of the peaks decreases dramatically. In the normal state, the resonant excitation does not occur and the IC peaks are merged into commensurate ones. The spin excitation of La_2\ensuremath-xSr_xCuO₄ is significantly different from that of Y-based ones, namely, the resonance peak does not exist due to the decreasing of the superconducting gap and the presence of the possible spin-stripe order. The spectra are only enhanced at the expected resonance frequency (about 18\phantom\rule0.3em0exmeV) while they are still incommensurate. On the other hand, another frequency scale is also revealed, namely, the spectra are commensurate and show local maximum at the frequency of 55\phantom\rule0.3em0exmeV. We elaborate all the results based on the Fermi surface topology and the d-wave superconductivity and suggest that the spin-stripe order is also important in determining the spin excitation of La-based cuprates. A coherent picture for the spin excitations is presented for Y-based and La-based cuprates.

Citations

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• Electronic Structure of the Trilayer Cuprate SuperconductorBi2Sr2Ca2Cu3O10+δ