Violation of the Curie law in Na2V3O7 as the crystal-field and spin-orbit coupling effect

摘要

We have shown that the observed drastic violation of the Curie-Weiss law inNa2V3O7, reported in Phys. Rev. Lett. 90 (2003) 167202, is caused byconventional crystal-field interactions and the intra-atomic spin-orbitcoupling of the V4+ ion. The fine discrete electronic structure of the 3d1configuration, with a substantial orbital moment, is the reason for anomalouslow-temperature properties of Na2V3O7. According to the Quantum AtomisticSolid-State Theory (QUASST) Na2V3O7 is expected to exhibit pronouncedheavy-fermion phenomena at low temperatures. This study confirm our earlierclaim that the orbital moment has to be unquenched in description of 3d-atomcompounds. PACS: 71.70.E, 75.10.D Keywords: crystal-field interactions, spin-orbit coupling, orbital moment,Na2V3O7