20.500.12556/RUL-164598 Higher-magnesium-doping effects on the singlet ground state of the Shastry–Sutherland SrCu$_2$(BO$_3$)$_2$ Doping of quantum antiferromagnets is an established approach to investigate the robustness of their ground state against the competing phases. Predictions of doping effects on the ground state of the Shastry−Sutherland dimer model are here verified experimentally on Mg-doped SrCu$_2$(BO$_3$)$_2$. A partial incorporation of Mg$^{2+}$ on the Cu$^{2+}$ site in the SrCu$_2$(BO$_3$)$_2$ structure leads to a subtle but systematic lattice expansion with the increasing Mg-doping concentration, which is accompanied by a slight decrease in the spin gap, the Curie−Weiss temperature, and the peak temperature of the susceptibility. These findings indicate a doping-induced breaking of Cu$^{2+}$ spin-1/2 dimers that is also corroborated by X-band EPR spectroscopy that points to a systematic increase in the intensity of free Cu$^{2+}$ sites with increasing Mg-doping concentration. Extending the Mg-doping up to nominal x = 0.10 yielding SrCu$_{1.9}$Mg$_{0.1}$(BO$_3$)$_2$, in the magnetization measurements taken up to 35 T, a suppression of the pseudo-1/8 plateau is found along with a clear presence of an anomaly at an onset critical field μ$_0$H’$_{C0}$ ≈ 9 T. The latter, absent in pure SrCu$_2$(BO$_3$)$_2$, emerges due to the pairwise coupling of liberated Cu$^{2+}$ spin-1/2 entities in the vicinity of Mg-doping induced impurities. doping electron paramagnetic resonance spectroscopy impurities magnetic properties quantum mechanics dopiranje magnetne lastnosti spektroskopija relativistična mehanika true false true Angleški jezik Slovenski jezik Članek v reviji 2024-11-05 08:41:10 2024-11-05 08:41:12 2024-11-22 14:54:59 0000-00-00 00:00:00 2024 0 0 Str. 20335–20346 iss. 43 Vol. 63 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 546 1520-510X 10.1021/acs.inorgchem.4c02398 212029955 sibav-et-al-2024-higher-magnesium-doping-effects-on-the-singlet-ground-state-of-the-shastry-sutherland-srcu2(bo3)2.pdf sibav-et-al-2024-higher-magnesium-doping-effects-on-the-singlet-ground-state-of-the-shastry-sutherland-srcu2(bo3)2.pdf 1 662A39C67FDF9138C74131AA96EE1241 20299861675541f4cd60e150c790905243f97e6c8cb9bb171d607a78e3e7a032 2cb279d8-9b4a-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=195142 https://pubs.acs.org/doi/10.1021/acs.inorgchem.4c02398 1 ff93b678-9b48-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=195141 Fakulteta za matematiko in fiziko Fakulteta za gradbeništvo in geodezijo 0 0 0