Using a unique CuO in NaSex flux, we discovered the new 2D compound NaCu4Se4 that exhibits a high hole mobility of ~808 cm2V-1s-1 and a nonsaturating linear MR ~1400% at 9 T.
Significance and Impact
Because NaCu4Se4, does not have apparent Dirac points or the typical features of materials with nonsaturating MR, its very existence implies new mechanisms to these exotic effects and should contribute to a deeper understanding of how they can arise.
- The need of CuO is crucial to form NaCu4Se4.
- X-ray photoelectron spectroscopy demonstrates the formula is (Na+)(Cu+)4(Se2-)(Se-)(Se2)2- with mixed valency on Se.
- First-principles calculations suggest multiple electronic bands crossing the Fermi level and the density of states around it composed of Cu-d and Se-p orbitals.
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