期刊
PHYSICAL REVIEW B
卷 84, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.224115
关键词
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资金
- Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, US Department of Energy. Ames Laboratory [DE-AC02-07CH11358]
- US DOE [DE-AC05-00OR22725]
- DOE Office of Basic Energy Sciences
- DOE [DE-AC52-06NA25396]
Inelastic neutron scattering is applied to study the role of magnetism in stabilizing the charge-ordered state in R1/3Sr2/3FeO3 (RSFO) (R = La, Pr, and Nd). The ratio of the ferromagnetic exchange energy J(F) and antiferromagnetic exchange energy J(AF), |J(F)/J(AF)|, is a key indicator of the stability of the charge-ordered and antiferromagnetic ordered state. This ratio is obtained from the spin-wave spectrum by inelastic neutron scattering and is sufficiently large to suggest that the magnetic exchange energy alone can stabilize the charge-ordered state in La1/3Sr2/3FeO3 and Pr1/3Sr2/3FeO3. The exchange ratio decreases from La1/3Sr2/3FeO3 to Nd1/3Sr2/3FeO3, which indicates a gradual destabilization of the magnetic exchange mechanism for charge ordering in correspondence with the observed reduction in the ordering temperature.
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