Raman and X-ray diffraction studies of superconducting FeTe1?xSex compounds

Frontiers of Physics and Plasma Science

Lodhi, Pavitra Devi^1 ; Awana, V.P.S.^2 ; Kaurav, Netram^1

Department of Physics, Government Holkar Science College, A. B. Road, Indore MP

452017, India^1

Superconductivity and Cryogenics Division, National Physical Laboratory, New Delhi

110012, India^2

关键词: High temperature superconducting;    High-temperature superconductivity;    Iron-based;    Layered compound;    Phonon mode;    Polycrystalline;    Tetragonal phase;    X-ray diffraction studies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/836/1/012046/pdf
DOI  :  10.1088/1742-6596/836/1/012046

来源: IOP

【 摘 要 】

Iron-based superconducting layered compounds have the second highest transition temperature after cuprate superconductors. Their discovery is a milestone in the history of high-temperature superconductivity and will have profound implications for high-temperature superconducting mechanism as well as industrial applications. We have measured X-ray diffraction and Raman spectra of poly-crystalline FeTe1-xSexsamples with x = 0.0, 0.5 and 1 at room temperature. X-ray profile of FeTe and FeTe0.5Se0.5confirmed the primitive tetragonal unit cell. FeSe is found to be in double phase with tetragonal phase (about 66.62%) and orthorhombic (33.38%). A1gand B1gphonon modes were observed in Raman spectra. At room temperature, these lines are located at 95 and 130 cm-1for FeTe, 93 and 129 cm-1for FeTe0.5Se0.5and 93 and 129 cm-1for FeSe samples.