JOURNAL ARTICLE

重电子化合物LiV<sub>2</sub>O<sub>4</sub>的电子结构

向明 陶军辉 何明秋 谭

Year: 2001 Journal:   Science in China Series A-Mathematics (in Chinese) Vol: 31 (12)Pages: 1142-1147

Abstract

用第一性原理的FP-LMTO能带计算方法研究了重电子化合物LiV 2 O 4 的电子结构. 结果表明, Fermi面附近的导带是由V原子的3d电子形成的宽度为2.5 eV的窄能带,是3 d态在立方晶体场中具有 t 2 g 对称性的子带;它与O的2p轨道构成的能带约有1.9 eV的能隙. 计算得出的Fermi能处电子态密度和线性电子比热系数分别是11.1 (states/eV· f -1 ·u -1 .)和26.7 mJ/mol·K 2 . Fermi面处的能带色散具有电子型和空穴型两种,呈现出一种复杂的Fermi面结构. L SDA以及GGA计算表明,LiV 2 O 4 有一个磁矩为1.13 μB/钒原子,总能比LDA基态低约148meV/f·u.的铁磁性基态. 由目前的能带结构计算的结果无法确定这一类Kondo体系的局域磁矩的来源,表明这一化合物中的重电子行为可能有别于在含有4f和5f稀土的重电子合金中观察到的局域磁矩与传导电子的交换作用机制,其中存在量子相变的可能.

Keywords:
Ampere Adenylate kinase Adenine nucleotide Chemistry Endocrinology Internal medicine Adenosine monophosphate Nucleotide Adenosine Biochemistry Biology Enzyme Medicine Physics Gene

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