Systematic deviation from<i>T</i>-linear behavior in the in-plane resistivity of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="italic">y</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>: Evidence for dominant spin scattering
Аннотация
The in-plane resistivity ${\mathrm{\ensuremath{\rho}}}_{\mathit{a}\mathit{b}}$(T) and Hall coefficient ${\mathit{R}}_{\mathit{H}}$(T) have been measured for ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathit{y}}$ single crystals with various oxygen concentrations. We find that for oxygen-depleted samples ${\mathrm{\ensuremath{\rho}}}_{\mathit{a}\mathit{b}}$(T) deviates from T-linear behavior and that ${\mathit{R}}_{\mathit{H}}$(T) deviates from 1/T below a temperature ${\mathit{T}}_{\mathit{o}}$ well above ${\mathit{T}}_{\mathit{c}}$. The deviation coincides with the development of a gap in the spin excitations seen in recent neutron and NMR studies. This is evidence that the charge transport in the ${\mathrm{CuO}}_{2}$ plane is determined by spin scattering.
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