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- W2080329009 abstract "We report a set of nuclear quadrupole resonance (NQR) measurements including a spin-echo double-resonance (SEDOR) experiment which provides convincing evidence that the additional chain Cu NQR line in Ca-substituted ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{4}$${mathrm{O}}_{8}$ does stem from chain Cu sites disturbed by the ``impurity'' Ca ions. From an analysis of signal intensities we conclude that ``impurity'' Ca ions, responsible for the additional line, substitute ${mathrm{Y}}^{3+}$. At high Ca doping, the concentration of the substituted Y sites, ${mathit{x}}^{ensuremath{'}}$, is appreciably smaller than the nominal Ca concentration, x. Since it is ${mathit{x}}^{ensuremath{'}}$ which is responsible for a direct increase of the hole charge-carrier concentration, n, effects connected with the increase of n such as the planar Cu spin-lattice relaxation rate, the NQR frequency, and the magnetic shift are only weakly dependent on x. Thus, the substantial increase of ${mathit{T}}_{mathit{c}}$ with x suggests that, besides the increase of n, other effects have to play a role in the ${mathit{T}}_{mathit{c}}$ enhancement. One such effect might be the opening of the spin pseudogap. At 150 K, both the main and additional Cu NQR lines in nominal ${mathrm{YBa}}_{1.9}$${mathrm{Ca}}_{0.1}$${mathrm{Cu}}_{4}$${mathrm{O}}_{8}$ show distinctly anomalies not seen in pure ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{4}$${mathrm{O}}_{8}$ that point out the Ca doping induced structural phase transition recently observed in specific-heat, elastic-neutron-scattering, and x-ray-diffraction measurements. textcopyright{} 1996 The American Physical Society." @default.
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- W2080329009 date "1996-02-01" @default.
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- W2080329009 title "NMR and NQR study of Ca-substituted superconductingYBa2Cu4O8" @default.
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- W2080329009 doi "https://doi.org/10.1103/physrevb.53.3550" @default.
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