Abstract
We report the magnetocapacitance effect and the magnetostriction in the spin-crossover (SCO) complex [MnIII(taa)] (H3taa = tris(1-(2-azolyl)-2-azabuten-4-yl)amine). It is shown that huge enhancements of dielectric constant and lattice volume are caused by the field-induced SCO transition from the low-spin to the high-spin states in [MnIII(taa)]. In addition, the temperature-field phase diagram of the field-induced SCO in thermal equilibrium state is clarified up to 28 T. Our analysis suggests that a large magnetocaloric effect can also be caused by the field-induced SCO. These results indicate the possibility of multiple control of various material properties by the field-induced SCO.
Highlights
Tuning the physical properties of materials by magnetic fields has attracted increasing interest from both fundamental and practical points of view
Magnetic properties and dielectric, thermal and mechanical properties can be tuned by magnetic fields
The MD effect, which is a change in the dielectric constant by the magnetic field, is important because it enables the development of, for instance, the field tunable capacitor
Summary
Tuning the physical properties of materials by magnetic fields has attracted increasing interest from both fundamental and practical points of view. Magnetocapacitance effect and magnetostriction by the field-induced spin-crossover in [MnIII(taa)] As a new approach to tune the various properties of a material by the magnetic field, we focus the magnetic-field-induced spin-crossover (SCO) transition.
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