Abstract

Real triangular lattice antiferromagnet with S =1/2 has been long-awaited since Anderson pointed out that its ground state might be a quantum liquid-like state rather than the Néel state. In this paper we report that NaTiO 2 and LiNiO 2 are promising candidates for it, the former being near Heisenberg-type and the latter near Ising-type. Our magnetization measurements on LiNiO 2 show a striking linear to nonlinear response transition at T N1 =210 K. A pronounced anomaly appears in ESR at another transition T N2 =∼20 K suggesting a ferrimagnet-like ordered state below. However, neither ferromagnetic nor antiferromagnetic reflections could be observed in zero field neutron scattering between 1.4 and 300 K. The susceptibility of NaTiO 2 is low suggesting a strong antiferromagnetic coupling between the spins but no Brass scattering could be observed at 1.4 K. These are suggestive of the remarkable quantum effects.

Keywords

Condensed matter physicsAntiferromagnetismPhysicsGround stateNeutron scatteringHexagonal latticeFerromagnetismMagnetizationIsing modelSpinsScatteringMagnetic fieldQuantum mechanics

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Publication Info

Year
1985
Type
article
Volume
54
Issue
9
Pages
3526-3536
Citations
165
Access
Closed

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Kinshiro Hirakawa, Hiroaki Kadowaki, Koji Ubukoshi (1985). Experimental Studies of Triangular Lattice Antiferromagnets with<i>S</i>=1/2: NaTiO<sub>2</sub>and LiNiO<sub>2</sub>. Journal of the Physical Society of Japan , 54 (9) , 3526-3536. https://doi.org/10.1143/jpsj.54.3526

Identifiers

DOI
10.1143/jpsj.54.3526