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Science 10 January 2003:
Vol. 299. no. 5604, p. 161
DOI: 10.1126/science.299.5604.161n
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This Week in Science
Quantum phase transitions, in which a material can be made to undergo a transition from one phase to another at zero temperature under the stimulus of an external parameter, are actively studied because they may provide better insight into other highly correlated systems. Much of the search is concentrated in the effort of designing, fabricating, and characterizing new test systems. Horiuchi et al. (p. 229) present results on expanded lattice charge-transfer salts and show that pressure and temperature dependence reveal the ability to tune the quantum critical point with external pressure. They provide evidence showing that the system exhibits a neutral-ionic quantum phase transition in which the covalently bonded molecules in the neutral phase can be transformed into an ionic system with the charge and spin reside on the donor and acceptor molecules of the salt complex.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
