The following article appeared in Physics World, vol. 12, no. 4, pg 33 (1999). Additional footnotes [9,10] have been added to the web version.

Quantum Phase Transitions

Subir Sachdev

Phase transitions are normally associated with changes of temperature but a new type of transition - caused by quantum fluctuations near absolute zero - is possible, and can tell us more about a wide range of systems in condensed matter physics


1  Introduction
2  Quantum Ising systems
3  High-temperature superconductors
4  Spins and stripes
5  Experiments on superconductors
6  Quantum Hall systems
7  Outlook