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Observation of transverse spin freezing by TDPAC |
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| Authors: | T A Webb D H Ryan |
| Institution: | 1. Department of Physics and Technology, Huazhong Normal University, Wuhan, 430070, China 2. Key Laboratory of Artificial Micro- and Nano-Materials of Ministry of Education and Accelerator Laboratory, School of Physics and Technology, Wuhan University, Wuhan, 430072, China 3. CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China |
| Abstract: | Mössbauer spectroscopy investigation of superconducting Sm0.85Ba0.15FeAsO0.7F0.3 (T c = 37 K) has been performed. The spectra appear to be a singlet pattern throughout the temperature range of 20–290 K. The value of Debye temperature is obtained (θ D ～ 390 K). Unusual behavior of the central shift as a function of temperature is observed below 60 K. Unlike cuprate superconductors, phonon softening is not observed near T c of the iron pnictide. |
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