title: Temperature- and Pressure-Induced Spin Crossover in Co1+xCr2-xSe4 (x = 0.24): A Diffraction Study.
abstract: The Co(2+) ions of the Co1+xCr2-xSe4 phase (Co1.24Cr1.76Se4 composition with x = 0.24, C2/m space group, Cr3S4-type structure) undergo a high- to low-spin-state transition around 230 K, as concluded from the temperature-dependent single-crystal synchrotron radiation diffraction experiments and the previously reported physical property studies. The change of the spin state is not instantaneous and goes through a wide spin-crossover (SCO) region of 75 K. A similar Co(2+) high- to low-spin-state transition is suggested at a pressure of 14.5 GPa, as is evident from the pressure-dependent single-crystal synchrotron radiation diffraction experiments. The corresponding SCO region is equal to 5 GPa, and the structural behavior is different from the one observed during the temperature-dependent transition. Coupling between the spin-conversion process in Co1+xCr2-xSe4 and the concomitant changes in the physical properties opens a way for a controlled tuning of the observed physical response through compositional and structural modifications.
authors.affiliation: ID27 High Pressure Beamline, ESRF, CS40220 , F-38043 Grenoble, France.
authors.forename: V
authors.initials: V
authors.lastname: Svitlyk
authors.affiliation: Swiss-Norwegian Beamlines, ESRF, CS40220 , F-38043 Grenoble, France.
authors.forename: D
authors.initials: D
authors.lastname: Chernyshov
authors.affiliation: Department of Chemistry and Chemical Biology, McMaster University , Hamilton, Ontario L8S 4M1, Canada.
authors.forename: Y
authors.initials: Y
authors.lastname: Mozharivskyj
authors.affiliation: Department of Chemistry and Chemical Biology, McMaster University , Hamilton, Ontario L8S 4M1, Canada.
authors.forename: F
authors.initials: F
authors.lastname: Yuan
authors.affiliation: Laboratory for Neutron Scattering, Paul Scherrer Institute , 5232 Villigen, Switzerland.
authors.forename: O
authors.initials: O
authors.lastname: Zaharko
authors.affiliation: ID27 High Pressure Beamline, ESRF, CS40220 , F-38043 Grenoble, France.
authors.forename: M
authors.initials: M
authors.lastname: Mezouar