Physics of Transition Metal Oxides
Physics of Transition Metal Oxides
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DOI：
10.1007/978-3-662-09298-9
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发表时间：
2004-08
期刊：
影响因子：
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通讯作者：
S. Maekawa;T. Tohyama;S. Barnes;S. Ishihara;W. Koshibae;G. Khaliullin
中科院分区：
文献类型：
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作者：
S. Maekawa;T. Tohyama;S. Barnes;S. Ishihara;W. Koshibae;G. Khaliullin
磁铁矿（Fe 3 O 4）在希腊时代就已经被认为是一种特殊的矿物，这一事实表明了过渡金属氧化物作为有用材料的悠久历史。1986年高温超导性的发现重新引起了人们对过渡金属氧化物的兴趣。高温超导体都是铜酸盐。为什么会这样？要回答这个问题，我们必须了解铜氧化物中的电子态。过渡金属氧化物也被称为磁体。它们可能会被发现贴在你厨房冰箱的门上。磁性材料不仅作为磁体而且作为电子材料是有价值的。锰氧化物最近受到特别的关注，因为它们具有极大的磁阻，这种效应如此之大，以至于被称为巨磁阻（CMR）。高温超导铜氧化物和CMR锰氧化物有什么区别？周期表中具有不完全d壳层的元素称为过渡元素。其中以Ti、V、Cr、Mn、Fe、Co、Ni、Cu等8种原子序数为22 ~ 29的元素最为重要。这些元素与氧形成化合物，并呈现出各种性质。高温超导和CMR就是例子。大多数磁性教科书都讨论了过渡金属氧化物的磁性。然而，当人们使用传统的教科书研究磁性时，人们发现在初始阶段没有引入输运性质。
The fact that magnetite (Fe304) was already known in the Greek era as a peculiar mineral is indicative of the long history of transition metal oxides as useful materials. The discovery of high-temperature superconductivity in 1986 has renewed interest in transition metal oxides. High-temperature su perconductors are all cuprates. Why is it? To answer to this question, we must understand the electronic states in the cuprates. Transition metal oxides are also familiar as magnets. They might be found stuck on the door of your kitchen refrigerator. Magnetic materials are valuable not only as magnets but as electronics materials. Manganites have received special attention recently because of their extremely large magnetoresistance, an effect so large that it is called colossal magnetoresistance (CMR). What is the difference between high-temperature superconducting cuprates and CMR manganites? Elements with incomplete d shells in the periodic table are called tran sition elements. Among them, the following eight elements with the atomic numbers from 22 to 29, ie, Ti, V, Cr, Mn, Fe, Co, Ni and Cu are the most im portant. These elements make compounds with oxygen and present a variety of properties. High-temperature superconductivity and CMR are examples. Most of the textbooks on magnetism discuss the magnetic properties of transition metal oxides. However, when one studies magnetism using tradi tional textbooks, one finds that the transport properties are not introduced in the initial stages.