Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 47: Frustrated Magnets II (joint session MA/TT)
TT 47.7: Talk
Wednesday, March 11, 2026, 11:15–11:30, POT/0361
Effect of Ca-doping on the exotic quantum spin liquid states of Y3Cu2Sb3O14 — •Muhammad Usama Akbar1, Hans-Albrecht Krug von Nidda1, Mamoun Hemmida1, Avinash Mahajan2, and Saikat Nandi2 — 1Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86135 Augsburg, Germany — 2Department of Physics, Indian Institute of Technology, Mumbai, 400076, India
The three-dimensional spin S = 1/2 compound Y3Cu2Sb3O14 was recently identified as a promising candidate for novel quantum spin liquid (QSL) behavior, with two inequivalent Cu2+ sites in edge-sharing triangles and no long-range order observed in multiple experiments [1]. NMR detects a transition near 120 K, associated with partial singlet formation, while muSR and DFT indicate frustrated antiferromagnetic interactions around both Cu+2 sites. ESR shows a Lorentzian line (g = 2.16) above 120 K that splits into two components on cooling, with only a part of spins being ESR-active. In the current work, we extend this investigation to Ca-doped Y3-xCaxCu2Sb3O14 (x = 0.05, 0.10, 0.25), to examine how chemical substitution at the Y site influences the spin dynamics of the compound.
[1] S. Nandi et al. (2025), arXiv:2509.15835 [cond- mat.str-el]
Keywords: Quantun Spin Liquids; Electronic Coorrelations; Electron Spin Resonance; Cuprates; Magnetic Frustration