λ相变
λ（lambda）相变是凝聚态物理学中的一类，将许多有强烈类似特性的系统放在一起，像是超流体、超导体及液晶。这些系统因为在相变的热力学临界特性，归于在同一个普适类。这些系统乍看之下差异很大，但可以用类似的公式描述，而而其相图是相同的。
氦在一般流体和超流体之间，比热容和不同温度的变化
若将氦在1标准大气压下降温，约为2.17 K（λ点）时，会从一般流体氦(I)相变到超流体氦(II)，其比热容对温度的图会类似希腊文的字母λ，因此称这类的相变为λ相变。
参考数据
书籍
- Chaikin P. M. and Lubensky T. C. Principles of Condensed Matter Physics (Cambridge University Press, Cambridge) 1995, sect.9.
- Feynman R. P. Progress in Low Temperature Physics Vol.1, edited by C. Gorter (North Holland, Amsterdam) 1955.
期刊论文
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