| Issue |
Europhys. Lett.
Volume 60, Number 2, October 2002
|
|
|---|---|---|
| Page(s) | 276 - 280 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00347-0 | |
| Published online | 01 October 2002 | |
Quantum phase transition in the dioptase magnetic lattice
1
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
Received:
17
April
2002
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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