DAUBRIC, H.; BERGER, R.; KLIAVA, Janis; CHASTANET, Guillaume; NGUYEN, Olivier; LÉTARD, Jean-François

doi:10.1103/PhysRevB.66.054423

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DAUBRIC, H.
Centre de physique moléculaire optique et hertzienne [CPMOH]

BERGER, R.
Centre de physique moléculaire optique et hertzienne [CPMOH]

KLIAVA, Janis
Centre de physique moléculaire optique et hertzienne [CPMOH]

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Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2002, vol. 66, n° 5, p. 054423 (8 p.)

American Physical Society

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We report an observation of the light-induced excited spin state trapping effect of Fe2+ ions using the electron paramagnetic resonance (EPR) technique. The experiment was carried out with a Mn2+-containing molecular crystal of cis-bis(thiocyanato)-bis[(N-2'-pyridylmethylene)-4- (aminobiphenyl)]-iron(II) phase I. First, the photomagnetic properties of the compound were investigated in order to determine the experimental conditions for a complete low-to-high-spin photoconversion of the Fe2+ ions. The photoinduced high-spin fraction and the light-induced thermal Hysteresis studies under light irradiation at 830 nm show that a complete spin photoconversion occurs in the temperature range below 40 K. The Mn2+ EPR spectra recorded at these temperatures clearly show two different patterns corresponding to the low-spin state of Fe2+ (without light irradiation) and to the metastable high-spin state of this ion (under light irradiation), confirming the complete spin photoconversion. The values of the zero-field splitting parameter D for Mn2+ in the low-temperature light-induced high-spin structure are determined by computer simulations of the EPR spectra. These values corroborate the temperature dependence of D obtained using the superposition model for the high-spin state of the compound above the thermal hysteresis loop.< Réduire

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Light-induced excited

Spin state trapping

Fe2+

Ions

Eectron paramagnetic resonance

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Light-induced excited spin-state trapping of Fe2+ observed by electron paramagnetic resonance of Mn2+

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