Cryogenics at Oxford Instruments

Cook, Tracy; McDougall, I.; Proctor, W.; Winson, P.H.

doi:10.1016/0011-2275(81)90001-1

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…The investigations in this study were performed using optical microscopy and photo-magnetic measurements. Cryogenic optical microscopy investigations [47,59,60] were conducted in a transmission mode using a standard optical microscope, Nikon Eclipse LV100, equipped with a fast CCD camera (DALSA Falcon 1.4 M100HG Color, 100 fps max, Dalsa, Ontario, Canada). Complete images of the crystal were recorded using an objective × 20 (numerical aperture (NA) = 0.4 with a resolution limit of~0.75 µm) as a function of temperature in transmission mode.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Evidence of Photo-Thermal Effects on the First-Order Thermo-Induced Spin Transition of [{Fe(NCSe)(py)2}2(m-bpypz)] Spin-Crossover Material

et al. 2019

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We have investigated by means of optical microscopy and magnetic measurements the first-order thermal spin transition of the [{Fe(NCSe)(py)2}2(m-bpypz)] spin-crossover compound under various shining intensities, far from the light-induced spin-state trapping region. We found evidence of photo-heating effects on the thermally-induced hysteretic response of this spin-crossover material, thus causing the shift of the thermal hysteresis to lower temperature regions. The experimental results are discussed in terms of the apparent crystal temperature and are analyzed theoretically using two evolution equations of motion, written on the high-spin (HS) fraction and heat balance between the crystal and the thermal bath. A very good qualitative agreement was found between experiment and theory in the stationary regime, explaining the experimental observations well and identifying the key factors governing these photo-thermal effects.

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Section: Experiments and Resultsmentioning

confidence: 99%

Evidence of Photo-Thermal Effects on the First-Order Thermo-Induced Spin Transition of [{Fe(NCSe)(py)2}2(m-bpypz)] Spin-Crossover Material

et al. 2019

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“…We used the transmission mode on a standard optical microscope Nikon Eclipse LV100 equipped with a fast CCD camera (DALSA Falcon 1.4M100HG Color, 100 fps max) and adapted to cryogenic experiments. ,, We automatically recorded the PC screen by using the CamStudio software. For obtaining complete images of the crystal, we used an ×20 objective (numerical aperture NA = 0.4), leading to a resolution limit of ∼0.75 μm.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Spatiotemporal Investigations on Light-Driven High-Spin–Low-Spin Interface Dynamics in the Thermal Hysteresis Region of a Spin-Crossover Single Crystal

Traiche

Fourati

et al. 2018

J. Phys. Chem. C

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We have investigated by optical microscopy the thermal spin transition of a single crystal of the spin-crossover compound [{Fe(NCSe)(py)2}2(m-bpypz)] under various shining intensities, far from the light-induced spin-state trapping region. We found evidence of photoheating on the thermally induced hysteretic response of the crystal, leading to the control of the transition temperature and the hysteresis width as a function of the light intensity. The inspections of the spatiotemporal behaviors of the spin-crossover transition, on heating and cooling, have also evidenced a significant dependence of the propagation speed of the high-spin–low-spin interface on the intensity of light. In particular, for strong shining intensities, a slowing of the interface speed at the transition is obtained, and an unprecedented dynamical two-step-like transition was observed in the thermal hysteresis. These results are analyzed theoretically using a spatiotemporal approach based on reaction–diffusion equations including the spin-state propagation and the heat transfer between the crystal and the thermal bath. The obtained results are in good agreement with experimental observations and lead to identification of the key factors governing the interface velocity and the thermal hysteresis behaviors under the light excitation in spin-crossover materials.

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