Theory of High \tc Ferromagnetism in $SrB_6$ family: A case of Doped Spin-1 Mott insulator in a Valence Bond Solid Phase

Details Theory of High \tc Ferromagnetism in $SrB_6$ family: A case of Doped Spin-1 Mott insulator in a Valence Bond Solid Phase Theory of High \tc Ferromagnetism in $SrB_6$ family: A case of Doped Spin-1 Mott insulator in a Valence Bond Solid Phase

2001-08-23

arxiv.org/abs/cond-mat/0108384v3

Physical Review, B65, 212403 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures; minor corrections, references added

Scientific paper

10.1103/PhysRevB.65.212403

Doped divalent hexaborides such as $Sr_{1-x}La_xB_6$ exhibit high \tc ferromagnetism. We isolate a degenerate pair of $2p$-orbitals of boron with two valence electrons, invoke electron correlation and Hund coupling, to suggest that the undoped state is better viewed as a spin-1 Mott insulator; it is predicted to be a type of 3d Haldane gap phase with a spin gap $\sim 0.1 eV$, much smaller than the charge gap of $ > 1.0 eV$ seen in ARPES. The experimentally seen high \tc `ferromagnetism' is argued to be a complex magnetic order in disguise - either a canted 6-sublattice AFM ($\approx 120^0$) order or its quantum melted version, a chiral spin liquid state, arising from a type of double exchange mechanism.

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