Journal ArticleDOI
Anisotropic Superexchange Interaction and Weak Ferromagnetism
TLDR
In this paper, the Anderson theory of superexchange was extended to include spin-orbit coupling and the antisymmetric spin coupling suggested by Dzialoshinski from purely symmetry grounds and the symmetric pseudodipolar interaction were derived.Abstract:
A theory of anisotropic superexchange interaction is developed by extending the Anderson theory of superexchange to include spin-orbit coupling. The antisymmetric spin coupling suggested by Dzialoshinski from purely symmetry grounds and the symmetric pseudodipolar interaction are derived. Their orders of magnitudes are estimated to be ($\frac{\ensuremath{\Delta}g}{g}$) and ${(\frac{\ensuremath{\Delta}g}{g})}^{2}$ times the isotropic superexchange energy, respectively. Higher order spin couplings are also discussed. As an example of antisymmetric spin coupling the case of Cu${\mathrm{Cl}}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O is illustrated. In Cu${\mathrm{Cl}}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O, a spin arrangement which is different from one accepted so far is proposed. This antisymmetric interaction is shown to be responsible for weak ferromagnetism in $\ensuremath{\alpha}$-${\mathrm{Fe}}_{2}$${\mathrm{O}}_{3}$, MnC${\mathrm{O}}_{3}$, and Cr${\mathrm{F}}_{3}$. The paramagnetic susceptibility perpendicular to the trigonal axis is expected to increase very sharply near the N\'eel temperature as the temperature is lowered, as was actually observed in Cr${\mathrm{F}}_{3}$.read more
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Angular Variation of Coercivity in Orthoferrite Single Crystals
S. Reich,S. Shtrikman,D. Treves +2 more
TL;DR: In this paper, the coercive force Hc as a function of the angle between the easy axis of magnetization and the external field has been studied in orthoferrite single crystals using the vibrating sample technique.
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A New Molybdenum-Oxide-Based Organic-Inorganic Hybrid Compound Templated by 5-(2-Pyridyl)tetrazole with New Topology and Canted Antiferromagnetism
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Quantum Hall ferromagnetic phases in the Landau level N = 0 of a graphene bilayer
Jules Lambert,Rene Cote +1 more
TL;DR: In this paper, a phase diagram of the chiral two-dimensional electron gas (C2DEG) in Bernal-stacked graphene bilayer at integer filling factors is presented.
Journal ArticleDOI
(Nitronyl nitroxide)-substituted trioxytriphenylamine radical cation tetrachlorogallate salt: a 2p-electron-based weak ferromagnet composed of a triplet diradical cation.
Masato Kuratsu,Shuichi Suzuki,Masatoshi Kozaki,Daisuke Shiomi,Kazunobu Sato,Takeji Takui,Tsuneki Kanzawa,Yuko Hosokoshi,Xiao-Zheng Lan,Yuji Miyazaki,Akira Inaba,Keiji Okada +11 more
TL;DR: The synthesis and the solid state magnetic properties of (nitronyl nitroxide)-substituted trioxytriphenylamine radical cation tetrachlorogallate, NNTOT(+)⋅GaCl(4)(-), are reported.
Journal ArticleDOI
Theory of orbital state and spin interactions in ferromagnetic titanates
TL;DR: A spin-orbital superexchange Hamiltonian in a Mott insulator with orbital degeneracy is investigated in this article, where the collective behavior of orbital angular momentum is studied.