Magnetic-field effects on the in-plane electrical resistivity in single-crystalLa2−xBaxCuO4andLa1.6−xNd0.4SrxCuO4aroundx=18: Implication for the field-induced stripe order

Abstract

Temperature dependence of the in-plane electrical resistivity, ${\ensuremath{\rho}}_{\mathrm{ab}}$, in various magnetic fields has been measured in the single-crystal ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Ba}}_{x}{\mathrm{CuO}}_{4}$ with $x=0.08$, 0.10, 0.11 and ${\mathrm{La}}_{1.6\ensuremath{-}x}{\mathrm{Nd}}_{0.4}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ with $x=0.12$. It has been found that the superconducting transition curve shows a so-called fan-shape broadening in magnetic fields for $x=0.08$, while it shifts toward the low-temperature side in parallel with increasing field for $x=0.11$ and 0.12 where the charge-spin stripe order is formed at low temperatures. As for $x=0.10$, the broadening is observed in low fields and it changes to the parallel shift in high fields above $9\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. Moreover, the normal-state value of ${\ensuremath{\rho}}_{\mathrm{ab}}$ at low temperatures markedly increases with increasing field up to $15\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. It is possible that these pronounced features of $x=0.10$ are understood in terms of the magnetic-field-induced stabilization of the stripe order suggested from the neutron-scattering measurements in the $\mathrm{La}\text{\ensuremath{-}}214$ system. The ${\ensuremath{\rho}}_{\mathrm{ab}}$ in the normal state at low temperatures has been found to be proportional to $\mathrm{ln}(1∕T)$ for $x=0.10$, 0.11, and 0.12. The $\mathrm{ln}(1∕T)$ dependence of ${\ensuremath{\rho}}_{\mathrm{ab}}$ is robust even in the stripe-ordered state.