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Soft modes and structural phase transitions

Conference:

Abstract

A survey of soft modes and their relationship to structural phase transitions is presented. After introducing the concept of a soft mode, the origin of softening is considered from a lattice-dynamical point. The Landau theory approach to structural transitions is then discussed, followed by a generalisation of the soft-mode concept through the use of the dynamic order-parameter susceptibility. The relationship of soft modes to broken symmetry is also examined. Experimental results for several classes of crystals are next presented, bringing out various features such as the co-operative Jahn-Teller effect. The survey concludes with a discussion of the central peak, touching upon both the experimental results and the theoretical speculations.
Authors:
Venkataraman, G [1] 
  1. Reactor Research Centre, Kalpakkam (India)
Publication Date:
Dec 01, 1979
Product Type:
Conference
Reference Number:
AIX-11-553455; EDB-81-071112
Resource Relation:
Journal Name: Bull. Mater. Sci.; (India); Journal Volume: 1:3-4; Conference: Academy discussion meeting on phase transitions, Bangalore, India, 19 - 22 Jun 1978
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; FERROELECTRIC MATERIALS; LATTICE VIBRATIONS; ORDER-DISORDER TRANSFORMATIONS; FERROMAGNETIC MATERIALS; DISPERSION RELATIONS; JAHN-TELLER EFFECT; LANDAU FLUCTUATIONS; PEROVSKITE; REVIEWS; SPIN; STRONTIUM COMPOUNDS; SYMMETRY BREAKING; TEMPERATURE DEPENDENCE; TITANATES; ALKALINE EARTH METAL COMPOUNDS; ANGULAR MOMENTUM; CALCIUM COMPOUNDS; CALCIUM OXIDES; CHALCOGENIDES; DOCUMENT TYPES; FLUCTUATIONS; MAGNETIC MATERIALS; MATERIALS; MINERALS; OXIDES; OXYGEN COMPOUNDS; PARTICLE PROPERTIES; PEROVSKITES; PHASE TRANSFORMATIONS; TITANIUM COMPOUNDS; TITANIUM OXIDES; TRANSITION ELEMENT COMPOUNDS; VARIATIONS; 656000* - Condensed Matter Physics
OSTI ID:
6530914
Country of Origin:
India
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: BUMSD
Submitting Site:
INIS
Size:
Pages: 129-170
Announcement Date:

Conference:

Citation Formats

Venkataraman, G. Soft modes and structural phase transitions. India: N. p., 1979. Web.
Venkataraman, G. Soft modes and structural phase transitions. India.
Venkataraman, G. 1979. "Soft modes and structural phase transitions." India.
@misc{etde_6530914,
title = {Soft modes and structural phase transitions}
author = {Venkataraman, G}
abstractNote = {A survey of soft modes and their relationship to structural phase transitions is presented. After introducing the concept of a soft mode, the origin of softening is considered from a lattice-dynamical point. The Landau theory approach to structural transitions is then discussed, followed by a generalisation of the soft-mode concept through the use of the dynamic order-parameter susceptibility. The relationship of soft modes to broken symmetry is also examined. Experimental results for several classes of crystals are next presented, bringing out various features such as the co-operative Jahn-Teller effect. The survey concludes with a discussion of the central peak, touching upon both the experimental results and the theoretical speculations.}
journal = {Bull. Mater. Sci.; (India)}
volume = {1:3-4}
place = {India}
year = {1979}
month = {Dec}
}