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We make use of the strong spin-charge coupling in the electron-doped cuprate$\mathrm{Nd}_{2-x}\mathrm{Ce}_x\mathrm{CuO}_4$ to probe changes in its spinsystem via magnetotransport measurements. We present a detailed study of theout-of-plane magnetoresistance in underdoped single crystals of this compound,including the nonsuperconducting, $0.05\,\leq x\,\leq 0.115$, andsuperconducting, $0.12\,\leq x\,\leq 0.13$, compositions. Special focus is puton the dependence of the magnetoresistance on the field orientation in theplane of the CuO$_2$ layers. In addition to the kink at the field-inducedtransition between the noncollinear and collinear antiferromagneticconfigurations, a sharp irreversible feature is found in the angle-dependentmagnetoresistance of all samples in the high-field regime, at fieldorientations around the Cu--O--Cu direction. The obtained behavior can beexplained in terms of field-induced reorientation of Cu$^{2+}$ spins within thecollinear antiferromagnetic state. It is, therefore, considered as anunambiguous indication of the long-range magnetic order.

physical review. b./physical review. b

Magnetotransport evidence of irreversible spin reorientation in the  collinear antiferromagnetic state of underdoped  $\mathrm{Nd}_{2-x}\mathrm{Ce}_x\mathrm{CuO}_4$