Magnetoelectric coupling in 4,4′-stilbenedinitrene

Abstract

We investigated the optical properties of 4,4'-stilbenedinitrene at low temperature and in high magnetic fields and compared the results with complementary first principles calculations. Both physical tuning parameters allow us to manipulate the singlet-triplet equilibrium, and by doing so, control the optical contrast (which is on the order of -2.5 × 10(2) cm(-1) at 555 nm and 35 T). Moreover, analysis of the magneto-optical response using a combined population and Beer's law framework reveals the singlet-triplet spin gap and identifies particular features in the absorption difference spectrum as deriving from singlet or triplet state excitations. These findings deepen our understanding of coupling in open shell molecules and show how chemical structure modification can modulate charge-spin interactions in organic biradicals.

Magnetic-field-induced shift of the optical band gap inNi3V2O8

“…This redistribution modifies the charge excitations in Ni 3 V 2 O 8 . Changes in local charge density also drive magnetoelectric effects in molecular systems [46].…”

Pressure-driven high-to-low spin transition in the bimetallic quantum magnet[Ru2(O2CMe)4]3O’Neal1, Liu2, Miller3 et al. 2014Phys. Rev. BSelf Cite15030View full textAdd to dashboardCite

“…These transitions can be as simple as low ↔ high spin in an isolated molecule or as complex as antiferromagnetic ↔ ferromagnetic, metamagnetic, and quantum critical processes in extended solids [2][3][4][5][6][7][8][9][10][11][12] . Spin crossovers in 4 and 5d-containing compounds are particularly interesting because spin-orbit coupling competes with electron correlations to reveal exotic properties [13][14][15][16][17][18][19] .…”