title: Unconventional magnetism in a nitrogen-containing analog of cupric oxide.
abstract: We have investigated the magnetic properties of CuNCN, the first nitrogen-based analog of cupric oxide CuO. Our muon-spin relaxation, nuclear magnetic resonance, and electron-spin resonance studies reveal that classical magnetic ordering is absent down to the lowest temperatures. However, a large enhancement of spin correlations and an unexpected inhomogeneous magnetism have been observed below 80 K. We attribute this to a peculiar fragility of the electronic state against weak perturbations due to geometrical frustration, which selects between competing spin-liquid and more conventional frozen states.
authors.affiliation: Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia.
authors.forename: A
authors.initials: A
authors.lastname: Zorko
authors.forename: P
authors.initials: P
authors.lastname: Jeglič
authors.forename: A
authors.initials: A
authors.lastname: Potočnik
authors.forename: D
authors.initials: D
authors.lastname: Arčon
authors.forename: A
authors.initials: A
authors.lastname: Balčytis
authors.forename: Z
authors.initials: Z
authors.lastname: Jagličić
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.forename: A L
authors.initials: AL
authors.lastname: Tchougréeff
authors.forename: R
authors.initials: R
authors.lastname: Dronskowski