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Temperature dependence of the Hall coefficient, R_H_, has been investigatedin charge-spin stripe-ordered La-214 high-T_c_ superconductors. Using thesimplest stripe-ordered system of La_2-x_Ba_x_CuO_4_, it has been clarifiedthat both the behavior of R_H_ and its sign exhibit significant dependences onthe hole concentration. That is, R_H_ is zero in the ground state of thecharge-spin stripe order at x=1/8, while it is negative in the less-stabilizedstate of the charge stripe for x<1/8. These are interpreted as owing to thedelicate balance of the contributions of the hole-like Fermi surface and thepossible electron pocket arising from the formation of the charge-spin stripeorder.

Hall coefficient in the ground state of stripe-ordered La_2-x_Ba_x_CuO_4_ single crystals