Magnetic behavior in the Cu-doped samples of La2/3Ca1/3Mn1-xCuxO3 (0 <= x <= 0.3)

In this paper. detailed measurements of magnetic behavior for La2/3Ca1/3Mn1 -xCxO3(0 less than or equal tox less than or equal to0.3) bulk materials fo r magnetic tit-id up to 10T are reported. Samples with lower doping (less t han or equal to 10%) are typically ferromagnets, whereas those with higher doping (greater than or equal to 20%) show weak ferromagnetic behavior at l ow temperatures. For 15% doping, some unusual magnetic behavior is observed , especially in the range of the metamagmetic transition associated with a sharp increase in magnetization near H-c similar to 2.8 T at low temperatur es. A possible interpretation for the experimental observations is presente d. (C) 2001 Published by Elsevier Science Ltd.