Conductivity, weak ferromagnetism and charge instability in $α-MnS$ single crystal

Details Conductivity, weak ferromagnetism and charge instability in $α-MnS$ single crystal Conductivity, weak ferromagnetism and charge instability in $α-MnS$ single crystal

2004-08-11

arxiv.org/abs/cond-mat/0408232v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 12 figures

Scientific paper

10.1103/PhysRevB.71.125204

The temperature dependence of resistivity, magnetization and electron-spin resonance of the $\alpha- MnS $ single crystal were measured in temperature range of $5 K < T < 550 K$. Magnetization hysteresis in applied magnetic field up to 0.7 T at $T=5 K, 77 K, 300 K$, irreversible temperature behavior of magnetization and resistivity were found . The obtained data were explained in terms of degenerate tight binding model using random phase approximation. The contribution of holes in $t_{2g}$ and $e_g$ bands of manganese ions to the conductivity, optical absorbtion spectra and charge instability in $\alpha -MnS $ were studied. Charge susceptibility maxima resulted from the competition of the on-site Coulomb interaction between the holes in different orbitals and small hybridization of sub-bands were calculated at $T=160 K, 250 K, 475 K$.

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