Discovery of Griffiths phase in itinerant magnetic semiconductor Fe_{1-x}Co_xS_2

Details Discovery of Griffiths phase in itinerant magnetic semiconductor Fe_{1-x}Co_xS_2 Discovery of Griffiths phase in itinerant magnetic semiconductor Fe_{1-x}Co_xS_2

2007-10-30

arxiv.org/abs/0710.5760v1

Physics

Condensed Matter

Materials Science

10 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.017209

Critical points that can be suppressed to zero temperature are interesting because quantum fluctuations have been shown to dramatically alter electron gas properties. Here, the metal formed by Co doping the paramagnetic insulator FeS$_2$, Fe$_{1-x}$Co$_x$S$_2$, is demonstrated to order ferromagnetically at $x>x_c=0.01\pm0.005$ where we observe unusual transport, magnetic, and thermodynamic properties. We show that this magnetic semiconductor undergoes a percolative magnetic transition with distinct similarities to the Griffiths phase, including singular behavior at $x_c$ and zero temperature.

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