Interesting physical properties hidden inside an uninteresting correlated electron system.
FeGa3 is a non-magnetic semiconducting compound. For a long period it has been considered only for high temperature thermoelectric properties (TE). However, Yin and Picket (1) last year theoretically suggested that possible magnetic ground state hidden inside this compound. Furthermore, they have closely investigated structure of this compound and found that Fe-Fe dimmers in this compound are in non-magnetic spin singlet state. Immediately following Bitter et al. (2) found that small amount Co doping changes the system into a heavy Fermion like with low temperature paramagnetic (PM) behavior and they suggest PM-state is possibly due to Co-Co dimer formation at very low temperature. Followed by that Storchak at al. (3) suggested spin-polaron state formation below 10K and further suggested spin-polaron as a mechanism for possible magnetic state in this compound. We have seen electronic structure of this compound is very sensitive to pressure when we have investigated this compound for TE properties (4). Further investigation gave us unbelievable results.
References:
(1) Evidence for a spin singlet state in the intermetallic semiconductor FeGa3, PRB, 82, 155202 (2010)
(2) Correlation effects in the small gap semiconductor FeGa3, Journal of Physics: Conference Series, 200, 012014 (2010)
(3) Thermal destruction of spin-polaron bands in the narrow-gap correlated semiconductors FeGa3 and FeSb2, J.Phys.Cond.Matter, 24, 18 (2012)
(4) Effect of chemical doping on the thermoelectric properties of FeGa(3), J.Applied Physics, 109, 103712 (2011)
Time: Oct 2, Tuesday, noon.
Location: Rm. 435, Nicholson Hall.
Foods and drinks will be provided.
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