Division of Global Research Leaders, Shizuoka University, Johoku 3-5-1, Naka-ku, Hamamatsu 432-8561, Japan.
Phys Rev Lett. 2009 Nov 13;103(20):207601. doi: 10.1103/PhysRevLett.103.207601. Epub 2009 Nov 9.
Despite intensive studies on Pb(Mg(1/3)Nb(2/3))O(3) (PMN) relaxor, understanding the exact nature of its giant dielectric response and of its physical ground state is a fundamental issue that has remained unresolved for decades. Here, we report a comprehensive study of PMN relaxor crystal, and show that (i) its anomalous dielectric behavior in a broad temperature range results from the reorientation of polarization in the crystal, and (ii) the PMN relaxor is essentially a nanosized ferroelectric material with multiscale inhomogeneities of domain structure in addition to the well-known inhomogeneities of chemical composition and local symmetry. Such inhomogeneities are believed to play a crucial role in producing the huge and enigmatic physical effects in relaxor system, and may be used to design other new systems with giant effects such as a relaxor system.
尽管对 Pb(Mg(1/3)Nb(2/3))O(3)（PMN）弛豫体进行了深入研究，但理解其巨大介电响应的确切性质及其物理基态是一个几十年来尚未解决的基本问题。在这里，我们报告了对 PMN 弛豫体晶体的综合研究，并表明：(i) 其在宽温度范围内的异常介电行为是由晶体中极化的重新取向引起的；(ii) PMN 弛豫体本质上是一种纳米级铁电材料，除了众所周知的化学成分和局部对称性不均匀性外，还具有多尺度畴结构的不均匀性。人们认为，这种不均匀性在产生弛豫体系统中巨大而神秘的物理效应方面起着至关重要的作用，并且可能被用于设计其他具有巨大效应的新系统，例如弛豫体系统。
