Successive orbital ordering transitions in NaVO2

T. M. McQueen, P. W. Stephens, Q. Huang, T. Klimczuk, F. Ronning, R. J. Cava

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59 Scopus citations

Abstract

Physical property measurements on samples of triangular-lattice NaVO2 reveal two successive orbital ordering transitions. At 300 K, the structure is rhombohedral. At 98 K, the system undergoes a second-order transition to a monoclinic phase in which the in-plane V-V distances separate into four short and two long bonds, corresponding to orbital ordering of one electron per V3+. Below 93 K, there is a first-order transition to a second monoclinic phase with four long and two short V-V bonds, consistent with orbital ordering of two electrons per V3+. Long range magnetic ordering of 0.98(2)μB per V3+ (3d2) sets in at the 93 K structural transition. The orbital ordering relieves the geometric frustration and leads to a magnetically ordered ground state.

Original languageEnglish (US)
Article number166402
JournalPhysical review letters
Volume101
Issue number16
DOIs
StatePublished - Oct 13 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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