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The remarkable sensitivity of the c-axis resistivity and magnetoresistance incuprates to the spin ordering is used to clarify the doping-inducedtransformation from an antiferromagnetic (AF) insulator to a superconducting(SC) metal in RBa_2Cu_3O_{6+x} (R = Lu, Y) single crystals. The establishedphase diagram demonstrates that the AF and SC regions apparently overlap: thesuperconductivity in RBa_2Cu_3O_{6+x}, in contrast to La_{2-x}Sr_xCuO_4, setsin before the long-range AF order is completely destroyed by hole doping.Magnetoresistance measurements of superconducting crystals with low T_c<15-20 Kgive a clear view of the magnetic-field induced superconductivity suppressionand recovery of the long-range AF state. What still remains to be understood iswhether the AF order actually persists in the SC state or just revives when thesuperconductivity is suppressed, and, in the former case, whether theantiferromagnetism and superconductivity reside in nanoscopically separatedphases or coexist on an atomic scale.

Magnetic-field induced superconductor-antiferromagnet transition in lightly doped RBa_2Cu_3O_{6+x} (R = Lu, Y) crystals