Pressure-induced two-step spin transition with structural symmetry breaking: X-ray diffraction, magnetic, and Raman studies | |
Article | |
关键词: ISING-LIKE MODEL; CROSSOVER COMPOUNDS; INTERMEDIATE PHASE; IRON(II) COMPLEXES; THERMAL HYSTERESIS; II COMPLEXES; TEMPERATURE; CONVERSION; COMPOUND; STATES; | |
DOI : 10.1103/PhysRevB.84.144107 | |
来源: SCIE |
【 摘 要 】
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-II(bapbpy)(NCS)(2)]. 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.
【 授权许可】
Free