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Electromechanical analog for Landau’s theory of second‐order symmetry‐breaking transitions

 

作者: E. Marega,   S. C. Zilio,   L. Ioriatti,  

 

期刊: American Journal of Physics  （AIP Available online 1990）
卷期: Volume 58, issue 7  

页码: 655-659

 

ISSN:0002-9505

 

年代: 1990

 

DOI:10.1119/1.16427

 

出版商: American Association of Physics Teachers

 

关键词: SYMMETRY BREAKING;PENDULUMS;TORSION;CRITICAL EXPONENTS;ELECTROMECHANICS;PHASE TRANSFORMATIONS;LANDAU THEORY;BENCH−SCALE EXPERIMENTS;ELECTRIC COILS

 

数据来源: AIP

 

摘要:

A simple electromechanical analog for Landau’s classical theory of second‐order symmetry‐breaking transitions is presented. The apparatus consists of a torsion pendulum, where a ceramic magnet suspended by two torsion springs is subjected to a uniform magnetic field. The pendulum angle is the analog of the order parameter in a phase transition, while the current passing through the Helmholtz coil, which produces the magnetic field, plays the role of temperature. With this setup, the critical exponents β, δ, γ, and γ’can be determined with good accuracy.

 

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