Effect of Quantum Fluctuations on Magnetic Ordering in CaV 3O 7
Abstract
We present a theoretical model for CaV3O7:the 1/4-depleted square spin-1/2 Heisenberg modelwhich includes both the nearest-neighbor coupling (J) and the next-nearest-neighbor coupling (J'),where J and J' are antiferromagnetic.Recent investigations on neutron diffraction by Harashina et al. revealed the occurrence of magnetic ordering at low temperatures,which may be called a stripe phase.It is shown that the observed spin structure is not stable according to the classical theory.By employing the modified spin wave theory, we show thatthe stripe phase is stabilized by the quantum fluctuationsfor J'/J > 0.69.In CaV3O7, J and J' are estimated to be nearly equalthroughout comparison of the theoretical and experimental results.
- Publication:
-
Journal of the Physical Society of Japan
- Pub Date:
- June 1996
- DOI:
- 10.1143/JPSJ.65.1566
- arXiv:
- arXiv:cond-mat/9603188
- Bibcode:
- 1996JPSJ...65.1566K
- Keywords:
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- Condensed Matter
- E-Print:
- submitted to J. Phys. Soc. Jpn