IPP Research Group "Low-dimensional magnets. Non-linear spin dynamics. Magnetic resonance."

Antiferromagnetic Stark-effect.

Figure: Antiferromagnetic Stark-effect in the Gd₂CuO₄. (f=36GHz, T=1.4K)
(a)(red)-responce to an electric field: component of the transmitted microwave signal detected on the frequency of the AC electric field vs. magnetic field
(b)(blue)-transmitted microwave power vs. magnetic field

The antiferromagnetic Stark effect was found in an antiferromagnet Gd₂CuO₄. It is the shift of the antiferromagnetic resonance frequency under electric field. Stark- effect in an antiferromagnet is a linear in electric field strength effect due to the linear magnetoelectric effect which is known for antiferromagnets of certain symmetry types. The figure demonstrates the influence of the electric field on the magnetic resonance in the experiment with an AC-electric field which modulates the eigenfrequency of the antiferromagnetic resonance and results in the field dependence of the absorption in form of a derivative of the resonance line.

References:

A.I.Smirnov, I.N.Khlyustikov, "Magnetoelectric effects in antiferromagnetic Gd₂CuO₄", Zh.Eksp.Teor.Fiz. v.108 p.706 (1995) [JETP v.81 p.384 (1995)]
A.I.Smirnov, "New magnetoelectric effects in antiferromagnet Gd₂CuO₄", Czech.Journ. Phys. 46 Suppl. S4 2139 (1996)