Muon spin relaxation studies of magnetic-field-induced effects in high-Tc superconductors -: art. no. 157001

Muon spin relaxation measurements in high transverse magnetic fields (parallel to c<^>) revealed strong field-induced quasistatic magnetism in the underdoped and Eu-doped (La,Sr)(2)CuO4 and La1.875Ba0.125CuO4, existing well above T-c and T-N. The susceptibility counterpart of Cu spin polarization, derived from the muon spin relaxation rate, exhibits a divergent behavior towards T similar to 25 K. No field-induced magnetism was detected in overdoped La1.81Sr0.19CuO4, optimally doped Bi2212, and Zn-doped YBa2Cu3O7.