Journal
SOLID STATE COMMUNICATIONS
Volume 119, Issue 8-9, Pages 507-510Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0038-1098(01)00279-4
Keywords
phase transitions; thermal expansion; neutron scattering
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The temperature (T)-dependent magnetization, transport, and magnetoresistance (MR) properties of a Mn-based compound GaCMn3 that has the antiperovskite structure were studied using neutron powder diffraction and SQUID measurements. With decreasing T, the magnetic phase transitions from a paramagnetic to an antiferromagnetic (AFM) state via an intermediate ferromagnetic (FM) phase are observed in this material. These magnetic transitions and their corresponding resistivity slopes d rho /dT are strongly correlated with linear thermal expansion coefficients of the lattice parameter a(-1) (da/dT). A large negative MR of 50% even at 0.3 T is seen near the phase boundary between the FM and AFM states. (C) 2001 Elsevier Science Ltd. All rights reserved.
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