High-resolution neutron diffraction study of CuNCN: new evidence of structure anomalies at low temperatureстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 29 декабря 2014 г.
Аннотация:Copper carbodiimide (CuNCN) is the nitrogen-containing analogue of cupric oxide. Based on
high-resolution neutron-diffraction data, CuNCN’s lattice parameters are derived as a function of
the temperature. In accordance with a recent synchrotron study, a clear trend in the cell parame-
ter a is observed accompanying the changing magnetic behavior. With decreasing temperature, a
slowly decreases to a minimum at ∼100 K after which it rises again. The same trend—albeit more
pronounced—is observed for the c lattice parameter at ∼35 K. The herein presented neutron powder-
diffraction data also support the conjectured sequence of transitions from the high-temperature
one-dimensional resonating valence-bond (RVB) state to a transient two-dimensional RVB state and
eventually, at lowest temperatures, into another two-dimensional RVB state, presumably the ground
state