TiOCl, TiOBr-are these RVB d1, S=1/2 materials? The results of scandium substitution set in the context of other S=1/2 systems of current interest for high-temperature superconductivity and the metal-insulator transition
TiOCl, TiOBr-are these RVB d1, S=1/2 materials? The results of scandium substitution set in the context of other S=1/2 systems of current interest for high-temperature superconductivity and the metal-insulator transition
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TiOCl、TiOBr——这些是 RVB d1、S=1/2 材料吗？
DOI：
10.1088/0953-8984/5/13/014
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
J. Wilson
中科院分区：
文献类型：
--
作者：
R. Beynon;J. Wilson
标题材料显示出异常的电、磁和光学特性。它们具有莫特绝缘体的特性，表现出高电阻和配体场光谱，但同时它们采用的磁性基态既不是居里-韦斯类型，也不是某种标准的反铁磁有序条件。观察到的状态是一种低度、各向同性且几乎与温度无关的顺磁性状态。作者研究了掺钪二氧化钛的磁性，寻找共振价键或 RVB 态存在的可能迹象，目前一些人认为这种状态是混合价铜酸盐中高温超导性的原因。有必要区分 RVB 和这些 S=1/2、2D 卤氧化物系统中磁挫败的一些极端情况。作者的初步结论是，TiOX 呈现出 RVB 基态，Sc 掺杂使其呈玻璃态和静态。
The title materials display anomalous electrical, magnetic and optical properties. They have the characteristics of Mott insulators showing high electrical resistance and ligand-field optical spectra, but at the same time they adopt a magnetic ground state which is neither of Curie-Weiss type nor indeed of some standard antiferromagnetically ordered condition. The observed state is one of lowish, isotropic, and almost temperature-independent paramagnetism. The authors have studied the magnetic properties of Sc-doped TiOX, seeking possible indications of the existence of the resonant valence bond or RVB state-the state currently suggested by some to be responsible for high-temperature superconductivity in the mixed-valence cuprates. It is necessary to distinguish between RVB and some extreme case of magnetic frustration in these S=1/2, 2D oxyhalide systems. The authors' tentative conclusion is that TiOX presents an RVB ground state which Sc doping renders glassy and static.