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Triggering the spin-crossover of Fe(phen)2(NCS)2 by a pressure pulse. Pressure and magnetic field induce ‘mirror effects’

✍ Scribed by Azzedine Bousseksou; Gábor Molnár; Jean-Pierre Tuchagues; Nieves Menéndez; Épiphane Codjovi; François Varret

Publisher: Elsevier Science
Year: 2003
Tongue: English
Weight: 139 KB
Volume: 6
Category: Article
ISSN: 1631-0748
DOI: 10.1016/s1631-0748(03)00042-0

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✦ Synopsis

We have studied the static and dynamic effects of pressure on the spin-transition in the temperature range of the thermal hysteresis loop for the compound Fe(phen) 2 (NCS) 2 . The high-spin fraction (n HS ) as a function of pressure and temperature has been determined by optical reflectivity. In this compound, the pressure was found to upward shift the spin-transition temperature by 23 K per kbar. During the dynamic pressure pulse, a decrease in n HS is observed, with an irreversible (reversible) character in the descending (ascending) branch of the hysteresis loop. In this respect, pressure has a 'mirror effect' compared to the application of an intense and pulsed magnetic field, for which -as reported previously -an increase in n HS is observed, with an irreversible (reversible) character in the ascending (descending) branch of the hysteresis loop.

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The transition temperature of [Fe@hen)z(NCS)z ] measured by susceptibility measurements in an applied tield of 1 T shifts by -0.11 f 0.04 K when the field is increased to 55 T. This shift is predicted on the basis of the known magnetic susceptibility and specific heat data.