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Piezoresistive Effect in the [Fe(Htrz)2(trz)](BF4) Spin Crossover Complex.

Andrei Diaconu1, Simona-Lacramioara Lupu1, Ionela Rusu1

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Hydrostatic pressure significantly alters the electrical conductivity of a spin crossover complex, [Fe(Htrz)2(trz)](BF4). This piezoresistive effect, linked to spin state switching, shows a large hysteresis, offering insights into material phase transitions.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Chemistry

Background:

  • Spin crossover complexes are molecular materials exhibiting a switchable spin state.
  • These materials are sensitive to external stimuli like temperature and pressure.
  • Understanding their response to pressure is crucial for potential applications.

Purpose of the Study:

  • To investigate the impact of hydrostatic pressure on the electrical properties of the [Fe(Htrz)2(trz)](BF4) spin crossover complex.
  • To quantify the piezoresistive effect and associated hysteresis.
  • To determine the pressure-temperature (P,T) phase diagram.

Main Methods:

  • Broad-band impedance spectrometry was employed under variable temperature and pressure conditions.
  • Electrical conductivity and dielectric permittivity were measured.
  • Hydrostatic pressure was applied up to 500 bar.

Main Results:

  • A significant piezoresistive effect exceeding one order of magnitude was observed.
  • A large pressure-induced hysteresis of 1700 bar was detected.
  • The pressure-induced spin state switching was identified as the origin of the piezoresistive behavior.

Conclusions:

  • Hydrostatic pressure is an effective stimulus to tune the electrical properties of [Fe(Htrz)2(trz)](BF4).
  • The observed piezoresistivity is directly linked to the spin crossover phenomenon.
  • The study provides a comprehensive P,T phase diagram, crucial for understanding and utilizing this material.