Metallic conductance below T{sub c} inferred by quantum interference effects in layered La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7}.
The metallic nature of the low-temperature conductivity {sigma} of the layered manganite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} is not obviously consistent with the very low values of {sigma} nor its slightly semiconducting behavior. We report low-temperature data in an applied field H which exhibit a positive sqrt[H] correction to {sigma}, for fields perpendicular to the Mn-O bilayers and also parallel to the layers, as well as for both current directions. This behavior is consistent with weak-localization effects in three-dimensional metals and with the theory of quantum interference, recently extended to highly anisotropic layered metals. In addition, a simple model is presented that adequately describes the positive magnetoconductance due to the suppression of spin waves.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 942929
- Report Number(s):
- ANL/MSD/JA-36039; TRN: US200923%%700
- Journal Information:
- Phys. Rev. B, Vol. 6302, Issue 2 ; Jan. 1, 2001; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- ENGLISH
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