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arXiv · 1806.05486

Magnetic inhomogeneity in the copper pseudochalcogenide CuNCN

A. Zorko·P. Jeglič·M. Pregelj·D. Arčon·H. Luetkens·A. L. Tchougréeff·R. Dronskowski
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Abstract

Copper carbodiimide, CuNCN, is a geometrically frustrated nitrogen-based analogue of cupric oxide, whose magnetism remains ambiguous. Here, we employ a combination of local-probe techniques, including $^{63,\, 65}$Cu nuclear quadrupole resonance, $^{13}$C nuclear magnetic resonance and muon spin rotation to show that the magnetic ground state of the Cu$^{2+}$ ($S=1/2$) spins is frozen and disordered. Moreover, these complementary experiments unequivocally establish an onset of intrinsically inhomogeneous magnetic state at $T_h=80$ K. Below $T_h$, the low-temperature frozen component coexist with the remnant high-temperature dynamical component down to $T_l = 20$ K, where the latter finally ceases to exist. Based on a scaling of internal magnetic fields of both components we conclude that the two components coexist on a microscopic level.

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A. Zorko, P. Jeglič, M. Pregelj, D. Arčon, H. Luetkens, A. L. Tchougréeff, R. Dronskowski. 2018-06-14. Magnetic inhomogeneity in the copper pseudochalcogenide CuNCN. https://doi.org/10.1103/physrevb.97.214432

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