Charge density glass dynamics - Soft potentials and soft modes

被引：4
作者：
Biljakovic, K. [1 ]
Staresinic, D. [1 ]
Lasjaunias, J. C. [2 ]
Remenyi, G. [2 ]
Melin, R. [2 ]
Monceau, P. [2 ]
Sahling, S. [3 ]
机构：
[1] Inst Phys, HR-10001 Zagreb, Croatia
[2] CNRS, Inst Neel, F-38042 Grenoble 9, France
[3] Univ Dresden, Inst Festkorperphys, D-01062 Dresden, Germany
来源：
PHYSICA B-CONDENSED MATTER | 2012年 / 407卷 / 11期
关键词：
Charge and spin density waves; Glasses; Thermodynamics; Soft potentials; Soft mode; TEMPERATURE SPECIFIC-HEAT; INCOMMENSURATE BIPHENYL; DISORDERED CHARGE; EXCITATIONS; RELAXATION; PHASONS;
D O I：
10.1016/j.physb.2012.01.020
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
An universal fingerprint of glasses has been found in low-temperature thermodynamic properties of charge/spin density wave (C/SDW) systems. Deviations from the well-known Debye, elastic continuum prediction for specific heat (flat C-p/T-3 plot) appear as two anomalies; the upturn below 1 K and a broad bump at T similar to 10 K (named Boson peak in glasses). The first one, inherent of localized two level systems within the shalow corrugated phase space, exhibits slow relaxation with the complex dynamics. The second one, "Boson peak-like peak" was attributed to the pinned mode and incomplete softening of CDW superstructural mode. We discuss similar C-p(T) features found also in incommensurate dielectrics with well documented soft-mode anomalies. (c) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：1741 / 1745
页数：5
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