Mössbauer study of 1/8 anomaly in La2−xBaxCuO4

The measurements of Mössbauer effect, magnetic susceptibility and muon spin relaxation have been carried out for the high-Tc superconductor La2−xBaxCuO4. The intensity of Mössbauer doublet spectrum of the sample of x∼1/8 begins to decrease rapidly at a certain temperature Tm, which we define as a ma...

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Bibliographic Details
Published in:Hyperfine interactions 2006-02, Vol.168 (1-3), p.1171-1174
Main Authors: Hikosaka Kazuhiro, Arai Juichiro
Format: Article
Language:English
Subjects:
Low temperature
Magnetic permeability
Magnetic transitions
Mossbauer effect
Mossbauer spectroscopy
Muon spin relaxation
Quadrupoles
Spin density waves
Superconductivity
Transition temperature
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Summary:The measurements of Mössbauer effect, magnetic susceptibility and muon spin relaxation have been carried out for the high-Tc superconductor La2−xBaxCuO4. The intensity of Mössbauer doublet spectrum of the sample of x∼1/8 begins to decrease rapidly at a certain temperature Tm, which we define as a magnetic transition temperature TMöss. This temperature almost agrees with TμSR determined from muon spin relaxation. The quadrupole doublet disappears at low temperature below Tm but a clearly splitted spectrum is not observed even at 4.2 K, which indicates a peculiar magnetic state with a wide distribution of internal magnetic field. Around x∼1/8, the superconducting critical temperature Tc and Tm are competed each other. In conclusion, superconductivity disappears around 1/8 hole concentration and a peculiar magnetic state such as spin density wave appears.
ISSN:0304-3843
1572-9540
DOI:10.1007/s10751-006-9418-y