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刘晓峻, XiaoJun LIU, Yutaka MORITOMO, Arao NAKAMURA, Takuya HIRAO, Shuji TOYAZAKI and Norimichi KOJIMA
Journal of the Physical Societ of Japan Vol. 70, No.9, September, 2001, pp. 2521-2524,-0001,():
-1年11月30日
We have observed a photoinduced hphase transition (PIPT) in a spin-crossover Fe(II) complex Nafion-[Fe(Htrz)3] film (Nafion is an ion exchange polmer film, and Htrz-1, 2, 4-1H-triazole) from a low-spin (LS) state (S=0) to a high-spin (HS) state (S=2) below 150K. The phototransferred HS state relaxed to the initial LS state, exhibiting a nonexponeential time behavior, which has bee interpreted in terms of the ciical nucleation and subsequent growth of the LS clusters. We have also observed that the decay time Tc is approximately temperature independent inthe low temperature range of 4.2-20K, and then decreases exponentially with temperature.
photoinduced phase transition,, spin-crossover complex,, critical nucleation,, relaxation behavior
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【期刊论文】A multilayer structured acoustic cloak with homogeneous isotropic materials
刘晓峻, Ying Cheng, Fan Yang, Jian Yi Xu, and Xiao Jun Liua
APPLIED PHYSICS LETTERS 92, 151913 (2008),-0001,():
-1年11月30日
An acoustic cloak with concentric alternating layered structure is designed with homogeneous isotropic materials on the basis of effective medium theory. The cloak possesses low-reflection and power-flow bending properties for different shapes of wavefront both in far-and near-fields, which could perfectly approximate the ideal cloak with inhomogeneous and anisotropic distribution of material parameters. © 2008 American Institute of Physics.
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刘晓峻, Y. Cheng and X. J. Liua
APPLIED PHYSICS LETTERS 93, 071903 (2008),-0001,():
-1年11月30日
The frequency response of the multilayered acoustic cloak made of isotropic materials is analyzed by the acoustic scattering theory. When concealing a rigid cylinder, the acoustic total scattering cross section (TSCS) monotonically increases with frequency. If concealing penetrable materials, the cloak-induced reverse-phase monopole and dipole resonances can increase the TSCS around the resonant frequencies, while the in-phase monopole resonance decreases the TSCS. The results are confirmed by numerical simulations of the finite element method. © 2008 American Institute of Physics.
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【期刊论文】Broad forbidden bands in parallel-coupled locally resonant ultrasonic metamaterials
刘晓峻
,-0001,():
-1年11月30日
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【期刊论文】Thermal Diffusivity of Ordered Duble Perovskite A2FeMoO6 (A=CA, Sr and Ba)*
刘晓峻, Liu Xiao-Jun**, HUANG Qiao-Jian, NIU Dong-LIN, XU Sheng, ZHANG Shu-Yi
CHIN.PHYS.LETT. Vol. 21, No.11 (2004) 2281,-0001,():
-1年11月30日
Thermal diffusivity has been investigated in ordered double perovskite Sr2FeMoO6 measn of transient surface grating technique in te temperatue rage of 300-450K. The thermal diffusivity showas an apprecialve decrese form 39mm/2s at 300K to 37mm/2 at 360K in the ferromagnetic phase, and then steeply drops to 10mm2/s with furtherincreasing temperature above the critical temperature Tc~380K. Such an abrupt decrease of the thermal diffusivity has been ascribed to the structural phase transition at Tc. We further investigate the lattice effect on the thermal diffusivity in A2FeMoO6 (A=Ca, Sr and Ba) by substitution of CA2+or Ba2+ ions for Sr2+ions at 300K. We find that the thermal difusivity increases form 35mm2/s for A=Ca to 41mm2/s for A=Ba. Considering the change of the Fe-O-Mo bond angle and hence the wider one-electrom bandwidth W.
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