| Autor: |
Vier, DC, Schultz, S, Rettori, C, Rao, D, Oseroff, SB, Tovar, M, Fisk, Z, Cheong, SW |
| Jazyk: |
angličtina |
| Rok vydání: |
1991 |
| Zdroj: |
Vier, DC; Schultz, S; Rettori, C; Rao, D; Oseroff, SB; Tovar, M; et al.(1991). Observation of an unusual ESR signal in antiferromagnetic Eu 2CuO4. Journal of Applied Physics, 69(8), 4872-4873. doi: 10.1063/1.348208. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/1zt2k54z |
| Popis: |
We report the observation of an unusual electron spin resonance (ESR) signal in single crystals of Eu2CuO4. The signal appears to be associated with a resonance mode of the CuO2 planes, similar to the midfield and low-field absorptions we have reported previously [Phys. Rev. B 41, 1934 (1990)]. However, it is only observed when the projection of the applied dc magnetic field in the CuO2 plane is within a few degrees of the 〈110〉 crystallographic direction. Additionally the sample must be field cooled in the CuO2 plane, but with a component of the cooling field perpendicular to the 〈110〉 ESR observation direction. Both the field for resonance and the linewidth exhibit a 1/cos θ dependence, where θ is the angle of the applied dc field between the c axis and the 〈110〉 observation direction. Additional constraints for observation of the resonance are that the microwave rf magnetic field must have a component in the CuO2 plane, but perpendicular to the dc field. The signal disappears above ∼215 K, which we assume is associated with the antiferromagnetic ordering temperature. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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