Issue |
Europhys. Lett.
Volume 64, Number 2, October 2003
|
|
---|---|---|
Page(s) | 260 - 266 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2003-00315-2 | |
Published online | 01 November 2003 |
Macroscopic quantum entanglement of oxygen molecules confined into nanopores
1
Technische Physik, Universität des Saarlandes - 66123 Saarbrücken, Germany
2
Institut Laue-Langevin, BP 156 - 38042 Grenoble, France
Received:
12
June
2003
Accepted:
12
August
2003
Solid molecular oxygen is a rare example of pure direct-exchange
interaction between localized electronic spins S=1.
Antiferromagnetic correlations between nearest
neighbors exist already in the liquid phase. When solidified,
undergoes two magneto-structural phase transitions. The
low-temperature phase is long-range ordered with collinear
antiferromagnetic alignment of the
spins. We performed
DC susceptibility measurements of
confined into the
nanometer-sized pores of silica substrates. At the smallest pore
diameters, all solid-solid phase transitions are suppressed. By
quantitative investigation of different degrees of filling, we
obtain convincing evidence that the major part of the spins is
entangled into a collective singlet ground state.
PACS: 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 75.75.+a – Magnetic properties of nanostructures / 75.50.Ee – Antiferromagnetics
© EDP Sciences, 2003
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