Phonon excitations in the quasi-one-dimensional Haldane phase of SrNi2V2O8
Phonon excitations in the quasi-one-dimensional Haldane phase of SrNi2V2O8
复制标题
SrNi2V2O8 准一维 Haldane 相中的声子激发
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
B. Lake
中科院分区：
文献类型：
--
作者：
V. Kurnosov;V. Gnezdilov;P. Lemmens;Y. Pashkevich;A. Bera;A. Islam;B. Lake
研究了具有单轴各向异性的偶联霍尔丹链化合物SrNi2V2O8单晶在10-1000 cm−1频率范围内，温度7-300 K的振动拉曼光谱。未观察到结构相变。基于不同结构配合物的局部对称性，分析了实验中观察到的声子线数及其强度。这种方法成功地解释了预期声子线数量与实验观察到的声子线数量之间的差异。一些结构单元的实际排列接近于比Wyckoff位置更高的对称性，导致光谱中许多拉曼线的强干涉猝灭。
Vibrational Raman spectra of a single crystal of the coupled Haldane chain compound SrNi2V2O8 with uniaxial anisotropy were investigated in the 10–1000 cm−1 frequency range at temperatures 7–300 K. No structural phase transition was observed. The number of phonon lines observed in the experiment and their intensity were analyzed on the basis of the local symmetry considerations of different structural complexes. This approach was successful in explaining the discrepancy between the numbers of expected and experimentally observed phonon lines. Closeness of a real arrangement of some structural units to higher symmetry than the Wyckoff position results in strong interferential quenching of a number of Raman lines in the spectra.