Volume 88, Number 2, October 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||22 October 2009|
Quantum electric dipole glass and frustrated magnetism near a critical point in Li2ZrCuO4
Institute for Solid State Research, IFW Dresden - 01171 Dresden, Germany, EU
2 Zavoisky Physical-Technical Institute of RAS - 420029 Kazan, Russia
3 Institute for Theoretical Solid State Physics, IFW Dresden - 01171 Dresden, Germany, EU
4 Ural State University - 620083 Ekaterinburg, Russia
5 A. F. Ioffe Physical-Technical Institute of the RAS - 194021 St.-Petersburg, Russia
6 Moscow State University - 119992 Moscow, Russia
Corresponding author: firstname.lastname@example.org
Accepted: 8 October 2009
We report a new peculiar effect of the interaction between a sublattice of frustrated quantum spin-1/2 chains and a sublattice of pseudospin-1/2 centers (quantum electric dipoles) uniquely co-existing in the complex oxide γ-Li2ZrCuO4 (≡ Li2CuZrO4). 7Li nuclear magnetic resonance, Cu2+ electron spin resonance and a complex dielectric constant data reveal that the sublattice of Li+-derived electric dipoles orders glass like at 70 K yielding a spin site nonequivalency in the CuO2 chains. We suggest that such a remarkable interplay between electrical and spin degrees of freedom might strongly influence the properties of the spiral spin state in Li2ZrCuO4 that is close to a quantum ferromagnetic critical point. In particular that strong quantum fluctuations and/or the glassy behavior of electric dipoles might renormalize the exchange integrals affecting this way the pitch angle of the spiral as well as be responsible for the missing multiferroicity present in other helicoidal magnets.
PACS: 75.10.Pq – Spin chain models / 76.60.-k – Nuclear magnetic resonance and relaxation / 77.22.-d – Dielectric properties of solids and liquids
© EPLA, 2009
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