Phys. Rev. Lett. 78, 4253–4256 (1997)Magnetic Ordering and Relation to the Metal-Insulator Transition in Pr1-xSrxMnO3 and Nd1-xSrxMnO3 with x ∼ 1/2Received 26 April 1996; revised 6 March 1997; published in the issue dated 2 June 1997 We studied three distorted perovskite manganites, Pr1/2Sr1/2MnO3 and Nd1-xSrxMnO3 with x = 1/2 and 0.55 by the neutron diffraction technique. Two samples with x = 1/2 exhibit a transition from a ferromagnetic (FM) metal to an antiferromagnetic (AFM) nonmetal. We demonstrate that, in the low temperature phase, Nd1/2Sr1/2MnO3 has a CE-type AFM structure with charge ordering, while Pr1/2Sr1/2MnO3 and Nd0.45Sr0.55MnO3 exhibit an A-type layered AFM structure, but show no clear sign of charge ordering. From the present results, we suggest a possible anisotropy of transport as well as magnetic properties in the A-type AFM structure near x∼1/2. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.4253
DOI:
10.1103/PhysRevLett.78.4253
PACS:
71.27.+a, 71.30.+h, 75.25.+z
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