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Phys. Rev. Lett. 100, 017209 (2008) [4 pages]

Discovery of the Griffiths Phase in the Itinerant Magnetic Semiconductor Fe1-xCoxS2

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S. Guo1, D. P. Young1, R. T. Macaluso2, D. A. Browne1, N. L. Henderson1, J. Y. Chan2, L. L. Henry3, and J. F. DiTusa1
1Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
2Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
3Department of Physics, Southern University, Baton Rouge, Louisiana 70813, USA

Received 5 June 2007; published 11 January 2008

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 FeS2, Fe1-xCoxS2 is demonstrated to order ferromagnetically at x>xc=0.01±0.005, 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 xc and zero temperature.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.017209
DOI:
10.1103/PhysRevLett.100.017209
PACS:
75.50.Pp, 72.15.Qm, 75.20.Hr, 75.40.−s
 
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