7 O ct 2 00 5 Electronic Properties of α ′ - NaV 2 O 5
نویسندگان
چکیده
منابع مشابه
Electronic Properties of α ′ - NaV 2 O 5
1 General properties of α −NaV 2 O 5 and motivation for a spectroscopic study Introduction – α −NaV 2 O 5 is one of the several phases in the class of Na x V 2 O 5 systems [1] and until now it is by far the most studied of them. Since 1996 this compound (denoted in the following simply by NaV 2 O 5) has received considerable attention because it was thought to be the second realization, after C...
متن کاملM ar 1 99 7 Experimental evidence for a spin - Peierls - transition in α ′ − NaV 2 O 5
We present the first measurements of magnetisation and Raman light scattering on α′ − N aV 2 O 5 single crystals. Below 34 K, we observe a pronounced isotropic decrease of the susceptibility indicating the opening of a spin gap. The transition temperature is slightly field dependent. Raman experiments reveal a crystallographic distortion at the transition. Our results clearly establish α′ − N a...
متن کاملX iv : n uc l - ex / 0 41 00 36 v 1 2 5 O ct 2 00 4 1 Branching ratio measurements of the 7 . 12 - MeV state in 16
Knowledge of the γ-ray branching ratios of the 7.12-MeV state of 16 O is important for the extrapolation of the 12 C(α,γ) 16 O cross section to astrophysical energies. Ground state transitions provide most of the 12 C(α,γ) 16 O total cross section while cascade transitions have contributions of the order of 10-20%. Determining the 7.12 → 6.92-MeV branching ratio will also result in a better ext...
متن کاملA ug 1 99 8 Infrared study of spin - Peierls compound α ́ - NaV 2 O 5 ∗
Infrared reflectance of α´-NaV 2 O 5 single crystals in the frequency range from 50 cm −1 to 10000 cm −1 was studied for a, b and c-polarisations. In addition to phonon modes identification, for the a-polarised spectrum a broad continuum absorption in the range of 1D magnetic excitation energies was found. The strong near-IR absorption band at 0.8 eV shows a strong anisotropy with vanishing int...
متن کامل