Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-12-22
Phys. Rev. B 81, 060414(R) (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
revised version, accepted as a Rapid Communication in Phys. Rev. B (2010)
Scientific paper
High field electron spin resonance, nuclear magnetic resonance and magnetization studies addressing the ground state of the quasi two-dimensional spin-1/2 honeycomb lattice compound InCu{2/3}V{1/3}O{3} are reported. Uncorrelated finite size structural domains occurring in the honeycomb planes are expected to inhibit long range magnetic order. Surprisingly, ESR data reveal the development of two collinear antiferromagnetic (AFM) sublattices below ~ 20 K whereas NMR results show the presence of the staggered internal field. Magnetization data evidence a spin reorientation transition at ~ 5.7 T. Quantum Monte-Carlo calculations show that switching on the coupling between the honeycomb spin planes in a finite size cluster yields a Neel-like AFM spin structure with a substantial staggered magnetization at finite temperatures. This may explain the occurrence of a robust AFM state in InCu{2/3}V{1/3}O{3} despite an unfavorable effect of structural disorder.
Buechner Bernd
Kataev Vladislav
Klingeler Rüdiger
Loew Ute
Moeller Angela
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