Low-Temperature Specific Heat of La{sub 1-x}Sr{sub x}MnO{sub 3+{delta}}
- Naval Research Laboratory, Washington, D.C. 20375 (United States)
The specific heat of the perovskite manganite La{sub 1-x}Sr{sub x}MnO{sub 3+{delta}} was measured in the doping regime x=0.0 to 0.3 where at low temperatures the material changes from a layered antiferromagnetic insulator to a ferromagnetic metal. A term in the specific heat, C{proportional_to}T{sup 2}, is found in LaMnO{sub 3} that is attributable to spin excitations in a layered antiferromagnet. Ferromagnetic samples have the expected specific heat term C{proportional_to}T{sup 3/2} due to ferromagnetic spin waves. The exchange coupling (J), electronic linear term ({gamma}), Debye temperature ({theta}{sub D}), and the local field at the Mn site (H{sub hyp}) are extracted from the specific heat as functions of Sr doping. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 491668
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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