Lambda point
The lambda point denotes a pressure-dependent temperature, below which a liquid becomes superfluid .
The lambda point takes its name from the graph that is created when the specific heat capacity is plotted as a function of temperature . The shape of the graph is similar to the Greek letter lambda "λ", whereby the specific heat capacity at the lambda point assumes the value infinite .
elements
The most common helium - isotope , 4 He ( hereinafter referred to as superfluid state helium II ), is at a pressure of 5036 Pa at a temperature below 2.1768 K superfluid. In addition, superfluidity could only be observed with 3 He and 6 Li when the lambda point was not reached.
Individual evidence
- ↑ fluidmech.net: SUPERFLUID HELIUM - WHAT IS IT? ( Memento of April 5, 2007 in the Internet Archive ).
- ^ Fermion Superfluidity in an Optical Lattice - Physics News Update 798 . www.aip.org. Archived from the original on April 10, 2013. Retrieved November 4, 2008.