Evolution of the hyperfine parameters of Fe in superconducting LiFeAs as observed by 57Fe Mössbauer spectroscopy

✍ Scribed by W.B. Gao; J. Lindén; X.C. Wang; C.Q. Jin; T. Tohyama; M. Karppinen; H. Yamauchi

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 389 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2010.06.010

✦ Synopsis

The LiFeAs superconductor is studied by 57 Fe Mössbauer spectroscopy to detect possible changes in the hyperfine parameters in terms of temperature upon passing the superconductivity-transitiontemperature at ∼16 K. With decreasing temperature, a rather fast growth of spectral area and isomer shift below T c , peaking at ∼6 K was seen. This indicates an increase in the stiffness of the lattice followed by softening.