Mössbauer spectroscopy on Fe impurities in germanium

✍ Scribed by H.P. Gunnlaugsson; G. Weyer; M. Dietrich; M. Fanciulli; K. Bharuth-Ram; R. Sielemann

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 445 KB
• Volume: 340-342
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2003.09.140

✦ Synopsis

M .

ossbauer experiments have been performed on the 14 keV g-radiation of 57 Fe emitted in the decay of ion-implanted (60 keV, o10 12 /cm 2 ), radioactive 57 Mn + ions in germanium single crystals held at temperatures of 77-800 K. At temperatures p300 K, a broad asymmetric quadrupole-split doublet, assigned to Fe in implantation-damage related sites, dominates the spectra. At B350 K these defects anneal during the 57 Mn lifetime (2.2 min) and the Mn atoms are incorporated mainly on substitutional lattice sites. An average recoil energy of 40 eV imparted on the 57 Fe daughter atoms in the nuclear decay expels the majority of the probe atoms into tetrahedral interstitial sites. A sizable fraction traps the mobile vacancy created in the recoil event, forming Fe i -V complexes within the lifetime of the 57m Fe M .

ossbauer state (140 ns), which are stable up to E700 K.