Structural and physical properties of SrMn{sub 1-x}Ru{sub x}O{sub 3} perovskites.
We combine the results of magnetic and transport measurements with neutron-diffraction data to construct the structural and magnetic phase diagram of the entire family of SrMn{sub 1-x}Ru{sub x}O{sub 3} (0 {le} x {le} 1) perovskites. We have found antiferromagnetic (AF) ordering of the C type for lightly Ru-substituted materials (0.06 {le} x {le} 0.5) in a similar manner to R{sub y}Sr{sub 1?y}MnO{sub 3} (R=La,Pr) due to the generation of Mn{sup 3+} in both families of manganite perovskites by either B-site substitution of Ru{sup 5+} for Mn{sup 4+} or A-site substitution of R{sup 3+} for Sr{sup 2+}. This similarity is driven by the same ratio of d{sup 4}/d{sup 3} ions in both classes of materials for equivalent substitution level. In both cases, a tetragonal lattice distortion is observed, which for some compositions (0.06 {le} x {le} 0.2) is coupled to a C-type AF transition and results in a first-order magnetic and resistive transition. Heavily substituted SrMn{sub 1?x}Ru{sub x}O{sub e} materials are ferromagnetic due to dominating exchange interactions between the Ru{sup 4+} ions. Intermediate substitution (0.6 {le} x {le} 0.7) leads to a spin-glass behavior instead of a quantum critical point reported previously in single crystals due to enhanced disorder.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; NSF
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 951052
- Report Number(s):
- ANL/MSD/JA-63269
- Journal Information:
- Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: 21 ; 2008 Vol. 78; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- ENGLISH
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