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Different nature of instabilities in BaFe 2 As 2 and BaNi 2 As 2 as revealed by optical spectroscopy
Author(s) -
Chen Z. G.,
Hu W. Z.,
Wang N. L.
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200983069
Subject(s) - superconductivity , condensed matter physics , spectroscopy , charge (physics) , physics , electrical resistivity and conductivity , phase transition , phase (matter) , materials science , quantum mechanics
The interplay between different instabilities, such as structural distortions, magnetic orderings, and superconductivity, is of great interest in condensed matter physics. The Fe‐ and Ni‐based layered pnictides offer a new opportunity to study the intriguing interplay between those instabilities. Both the FeAs‐ and NiAs‐based 122 compounds show rather sharp phase transitions, and similar anomalies can be found from resistivity and specific heat measurements. Here we show by optical spectroscopy measurements that the charge dynamics across the transitions in BaFe 2 As 2 and BaNi 2 As 2 are significantly different. The study reveals that the driving mechanisms for the instabilities are different.