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  • Magnetic field tuning of parallel spin stripe order and fluctuations near the pseudogap quantum critical point in ▫$La_{1.36}Nd_{0.4}Sr_{0.24} CuO_4$▫
    Ma, Qianli ...
    A quantum critical point in the single-layer, hole-doped cuprate system La1.6−xNd0.4SrxCuO4 (Nd-LSCO) near x = 0.23 has been proposed as an organizing principle for understanding high-temperature ... superconductivity. Our earlier neutron diffraction work on Nd-LSCO at optimal and high doping revealed static parallel spin stripes to exist out to the quantum critical point and slightly beyond, at x = 0.24 and 0.26. We examine more closely the parallel spin stripe order parameter in Nd-LSCO in both zero magnetic field and fields up to 8 T for H II c in these single crystals. In contrast to earlier studies at lower doping, we observe that H II c in excess of ~2.5 T eliminates the incommensurate quasi-Bragg peaks associated with parallel spin stripes. But this elastic scattering is not destroyed by the field; rather it is transferred to commensurate Q = 0 Bragg positions, implying that the spins participating in the spin stripes have been polarized. Inelastic neutron scattering measurements at high fields show an increase in the low-energy, parallel spin stripe fluctuations and evidence for a spin gap [delta]spin = 3 ± 0.5 meV for Nd-LSCO with x = 0.24. This is shown to be consistent with spin-gap measurements as a function of superconducting TC over five different families of cuprate superconductors, which follow the approximate linear relation [delta]spin = 3.5kBTC.
    Vir: Physical review. B. [Elektronski vir]. - ISSN 2469-9969 (Vol. 106, iss. 21, 1 Dec. 2022, str. 214427-1-214427-10)
    Vrsta gradiva - e-članek ; neleposlovje za odrasle
    Leto - 2022
    Jezik - angleški
    COBISS.SI-ID - 135765251
    DOI

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