Static magnetic order on the triangular lattice in with

✍ Scribed by Jun Sugiyama; Kazuhiko Mukai; Yutaka Ikedo; Hiroshi Nozaki; Peter L. Russo; Daniel Andreica; Alex Amato; Kingo Ariyoshi; Tsutomu Ohzuku

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 354 KB
• Volume: 404
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2008.11.102

✦ Synopsis

In spite of numerous experimental and theoretical reports on LiNiO 2 , due to fundamental interest because its Ni 3þ ions form a triangular S ¼ 1 2 two-dimensional lattice, no consistent picture has emerged of the nature of its ground state. We have investigated the Li x NiO 2 system ð0:1pxp1Þ using muon-spin spectroscopy to gain further insight from the effects of varying the spin concentration. Static magnetic order, most likely to be incommensurate to the spatial lattice period, was found for xX0:6, while disordered magnetism due to localized Ni moments appears for x ¼ 1 2 À 1 4 , and, finally, Li 0:1 NiO 2 exhibits almost fully non-magnetic behavior. Combining the result of susceptibility measurements, the ground state of LiNiO 2 is thought to be a ''static but short-range'' A-type antiferromagnetic ordered system. That is, the Ni 3þ moments align ferromagnetically along the c-axis in the NiO 2 plane with an incommensurate modulation probably due to canting of the Ni 3þ moments, but antiferromagnetically between the adjacent NiO 2 planes.