Dynamic Spin Fluctuations in the Frustrated A-site Spinel CuAl2O4

Abstract

We performed nuclear magnetic resonance (NMR) and muon spin relaxation (μSR) experiments to identify the magnetic ground state of the frustrated quantum A-site spinel, CuAl2O4. Our results verify that the ground state does not exhibit a long-range magnetic ordering, but a glass-like transition manifests at T*=2.3 K. However, the Gaussian shape and the weak longitudinal field dependence of μSR spectra below T* show that the ground state has dynamic spin fluctuations, distinct from those of conventional spin-glasses.

22 pages, 7 figures

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• Room Temperature Ferrimagnetism, Magnetodielectric and Exchange Bias Effect in CoFeRhO${}_4$
• Local spin dynamics in geometrically frustrated Mo pyrochlore antiferromagnet Lu${}_2$Mo${}_2$O${}_{5-y}$N${}_2$
• High-pressure synthesis of quantum magnet M-YbTaO4 with a stretched diamond lattice
• Disorder-induced spin excitation continuum and spin-glass ground state in the inverse spinel CuGa${}_2$O${}_4$