A Way to Search for Multiferroic Materials with “Unlikely” Combinations of Physical Properties
A Way to Search for Multiferroic Materials with “Unlikely” Combinations of Physical Properties
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DOI：
10.1007/3-540-31631-0_9
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
R. James;Z. Zhang
中科院分区：
文献类型：
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作者：
R. James;Z. Zhang
这一章提出的想法始于物理学家(Hill[1，2]和Hill和Rabe[3])的观察，通过使用第一原理研究来探索新的现象，即铁磁性和铁电性不太可能同时发生。虽然这些研究通常不考虑相变的可能性，但有许多间接证据表明，如果允许晶格参数稍有变化，则可能存在铁磁性和铁电性等不相容性质的共存。因此，人们可以尝试以下方法：寻求可逆的一级相变，必然也涉及到扭曲，比如说，从铁电相到铁磁相。如果它是高度可逆的，就有可能用场或应力来控制相的体积分数。关键是可逆性。本章就是对这些思想的探索。要将这些想法作为寻找新材料的基础，有两个主要问题需要解决：
The ideas presented in this chapter begin with the observation by physicists (Hill [1, 2] and Hill and Rabe [3]), probing new phenomena through the use of first principles studies, that the simultaneous occurrence of ferromagnetism and ferroelectricity is unlikely. While these studies do not usually consider the possibility of a phase transformation, there is a lot of indirect evidence that, if the lattice parameters are allowed to change a little, then one might have coexistence of “incompatible properties” like ferromagnetism and ferroelectricity. Thus, one could try the following: seek a reversible first-order phase transformation, necessarily also involving a distortion, from, say, ferroelectric to ferromagnetic phases. If it were highly reversible, there would be the interesting possibility of controlling the volume fraction of phases with fields or stress. The key point is reversibility. This chapter is an exploration of these ideas. To use these ideas as the basis for the search for new materials there are two major questions that need to be addressed: