Reentrant spin-glass behavior in $TlFe_{2-x}Se_2$ with the $ThCr_2Si_2$-type structure

Details Reentrant spin-glass behavior in $TlFe_{2-x}Se_2$ with the $ThCr_2Si_2$-type structure Reentrant spin-glass behavior in $TlFe_{2-x}Se_2$ with the $ThCr_2Si_2$-type structure

2010-12-14

arxiv.org/abs/1012.2929v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 6 figures, submitted to PRB on 12 Nov 2010

Scientific paper

We investigated the physical properties of $TlFe_{2-x}Se_2$ single crystals. The resistivity of $TlFe_{2-x}Se_2$ shows typical semiconductor behavior with an activation energy of 25 meV. DC susceptibility indicates an antiferromagnetic transition at about 450 K. Reentrant spin-glass (RSG) behavior was found at about 130 K through DC and AC magnetic measurements. The RSG behavior suggests the existence of a strong competition between ferromagnetic (FM) and antiferromagnetic (AFM) interactions due to Fe deficiencies. Strong electron-electron correlation may exist in this material and it is possibly a candidate of parent compound for high $T_c$ superconductors.

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