AI Article Synopsis
- Copper carbodiimide (CuNCN) is similar to cupric oxide and its lattice parameters change with temperature, as shown by high-resolution neutron-diffraction data.
- As temperature decreases, the a lattice parameter shows a decreasing trend until about 100 K, after which it starts to increase, with the c lattice parameter demonstrating a more significant change around 35 K.
- The neutron powder-diffraction data support a proposed sequence of magnetic phase transitions, moving from a high-temperature one-dimensional RVB state to transient two-dimensional RVB states, ultimately reaching a stable ground state at the lowest temperatures.
Article Abstract
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 parameter 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.
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| http://dx.doi.org/10.1063/1.4840555 | DOI Listing |
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