Two-dimensional intrinsic and extrinsic ferromagnetic behavior of layered La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} single crystals
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
The low-field magnetization M and susceptibility {chi} are reported for the two-layered Ruddleson-Popper phase SrO(La{sub 1{minus}x}Sr{sub x}MnO{sub 3}){sub 2} for x=0.4 (denoted La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7}) with an in-plane magnetic easy axis. As T approaches the Curie temperature ( T{sub C}=116 K) on cooling, where the metal-insulator transition occurs in zero field, {chi} diverges as H{sup {minus}1/{delta}{sup {prime}}}, with {delta}=21{plus_minus}5. Also, near an extrinsic Curie transition attributed to {approximately}0.1{percent} volume fraction of intergrowths at T{sup {asterisk}}=2.47 T{sub C}, M scales as (1{minus}T/T){sup {beta}}, with {beta}=0.25{plus_minus}0.02. These results can be understood within the context of two-dimensional XY models, and provide some perspective of the layered manganites. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 565870
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 1 Vol. 57; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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