SHEPHERD, Helena; BONNET, Sylvestre; GUIONNEAU, Philippe; BEDOUI, Salma; GARBARINO, Gastón; NICOLAZZI, William; BOUSSEKSOU, Azzedine; MOLNÁR, Gábor

doi:10.1103/PhysRevB.84.144107

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SHEPHERD, Helena
Department of Chemistry
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire de chimie de coordination [LCC]

BONNET, Sylvestre
Leiden Institute of Chemistry

GUIONNEAU, Philippe
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2011, vol. 84, n° 14, p. 144107

American Physical Society

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We have used single-crystal x-ray diffraction, Raman spectroscopy, and magnetometry to investigate the effect of hydrostatic pressures up to 16 kbar on the molecular spin crossover complex [Fe<sup>II</sup>(bapbpy)(NCS)<sub>2</sub>]. A stepped first-order transition from the high-spin (HS) to low-spin (LS) phase was observed upon compression of single-crystal samples. The intermediate phase (IP) is stable between 4 and 11 kbar at room temperature. This phase is characterized by supercell reflections and tripling of the c-axis of the unit cell (C2/c) due to the formation of a periodic [HS-LS-LS] structural motif, as seen in the thermal stepped transition. The pressure-temperature phase diagram reveals an anomalous increase of the thermal hysteresis widths with increasing pressure and the stabilization of the IP across the investigated P-T space.< Réduire

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Pressure-induced two-step spin transition with structural symmetry breaking: X-ray diffraction, magnetic, and Raman studies

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