Abstract
The spin-spin relaxation rate 63 T −12 of 63Cu nuclei in CuO2 layers is measured in the normal and superconducting states of the compound YBa2Cu3O6.9 (T onsetc =94 K) subjected to radiation-induced disordering by a fast-neutron flux Φ to T onsetc =68 K (Φ=7×1018 cm−2) and T onsetc <4 K (Φ=12×1018 cm−2). It is found that as the structural disorder increases, the contribution of the indirect spin-spin interaction 63 T −12G , which is related to the value of the spin susceptibility at the boundary of the Brillouin zone of the copper planes χs(q={π/a; π/a}), decreases slightly at the transition to the superconducting state for the initial sample and remains unchanged for the weakly disordered sample. This behavior of the short-wavelength contribution to the spin susceptibility attests to the stability of the x 2−y 2 symmetry of the energy gap against structural disorder, in accordance with proposed theoretical models of Cooper pairing for high-T c cuprates.
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Pis’ma Zh. Éksp. Teor. Fiz. 67, No. 3, 172–177 (10 February 1998)
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Anan’ev, A.V., Zhdanov, Y.I., Gerashchenko, A.P. et al. Spin susceptibility of neutron-irradiation-disordered YBa2Cu3O6.9 in the normal and superconducting states. Jetp Lett. 67, 182–188 (1998). https://doi.org/10.1134/1.567648
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DOI: https://doi.org/10.1134/1.567648