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A Neutron Diffraction Study of Co2Ru1-xMnxO4 Spinels

Published online by Cambridge University Press:  16 February 2011

D. Mandrus ,
V. Keppens ,
B. C. Chakoumakos ,
G. E. Granroth  and
S. E. Nagler
D. Mandrus
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
V. Keppens
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
B. C. Chakoumakos
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
G. E. Granroth
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
S. E. Nagler
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
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Abstract

Powder neutron diffraction and magnetization measurements are presented on the Co2Ru1-xMnxO4 system. In these materials the tetrahedral (A) sites are occupied by Co2+ (S = 3/2) ions, and the octahedral (B) sites are jointly occupied by Co3+ (low spin, S = 0), Ru3+ (low spin, S = 1/2), and Mn3+ (S = 2) ions. The measurements reveal that Co2RuO4 undergoes a spin-glass transition, Co2MnO4 is a collinear ferrimagnet, and that Co2Ru0.5Mn0.5O4 undergoes an unusual magnetic double transition. Triple-axis measurements indicate that the lower temperature transition in Co2Ru0.5Mn0.5O4 is characterized by the onset of diffuse scattering and the emergence of short-range order. The Co2Ru1-xMnxO4 series appears to be well-suited for studying the coexistence of long- and short-range magnetic order.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 177
Copyright
Copyright © Materials Research Society 1999

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