Double-exchange selection rule for the c-axis conductivity in layered La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} single crystals below T{sub c}
- Materials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
For the c-axis conductivity, {sigma}{sub c}, of the colossal-magnetoresistive layered manganite La{sub 1.4}Sr{sub 1.6}Mn{sub 2}O{sub 7} below T{sub c} experimental evidence supports the double-exchange (DE) selection rule, i.e., {sigma}{sub c}{approx}cos{sup 2}({eta}/2), where {eta} is the angle between Mn spins in neighboring bilayers. Below T{sub c}, the data also determine the interbilayer magnetic exchange constant, which is reasonable with respect to recent spin-wave data, and the magnetocrystalline anisotropy. For c-axis fields, a mixed AF and spin-flop state (similar to the intermediate state of type-I superconductors) is a rigorous prediction of the data and modeling. (c) 2000 The American Physical Society.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- OSTI ID:
- 20215834
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 14 Vol. 61; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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