Volume 60, Number 2, October 2002
|Page(s)||276 - 280|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 October 2002|
Quantum phase transition in the dioptase magnetic lattice
Fachbereich Physik, Postfach 151150, Universität des Saarlandes 66041 Saarbrücken, Germany
2 IMNF, TU Braunschweig, D-38106 Braunschweig, Germany
3 II. Physikalisches Institut, RWTH-Aachen Templergraben 55, 52056 Aachen, Germany
4 Max-Planck-Institut für Chemische Physik fester Stoffe MPI-CPfS, D-01187 Dresden, Germany
5 Institut für Mineralogie und Mineralische Rohstoffe, TU Clausthal D-38678 Clausthal-Zellerfeld, Germany
Accepted: 6 August 2002
The study of quantum phase transitions (see Sachdev S., Quantum Phase Transitions (Cambridge University Press, Cambridge) 1999), which are zero-temperature phase transitions between distinct states of matter, is of current interest in research since it allows for a description of low-temperature properties based on universal relations. Here we show that the crystal green dioptase , known to the ancient Romans as the gem of Venus, has a magnetic crystal structure, formed by the Cu(II) ions, which allows for a quantum phase transition between an antiferromagnetically ordered state and a quantum spin liquid.
PACS: 71.20.Be – Transition metals and alloys / 73.43.Nq – Quantum phase transitions / 75.10.Jm – Quantized spin models
© EDP Sciences, 2002
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