Dynamic Spin Fluctuations in the Frustrated A-site Spinel CuAl2O4
Hwanbeom Cho, R. Nirmala, Jaehong Jeong, Peter J. Baker, Hikaru, Takeda, Nobuyoshi Mera, Stephen J. Blundell, Masashi Takigawa, D. T. Adroja,, and Je-Geun Park
TL;DR
This study investigates the magnetic ground state of the frustrated quantum A-site spinel CuAl2O4 using NMR and muon spin relaxation, revealing a dynamic, glass-like state without long-range order below 2.3 K.
Contribution
It provides experimental evidence of a dynamic, glass-like magnetic state in CuAl2O4, distinct from conventional spin-glasses, using NMR and {bc}SR techniques.
Findings
No long-range magnetic order detected
Presence of a glass-like transition at 2.3 K
Ground state exhibits dynamic spin fluctuations
Abstract
We performed nuclear magnetic resonance (NMR) and muon spin relaxation ({\mu}SR) 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 {\mu}SR spectra below T* show that the ground state has dynamic spin fluctuations, distinct from those of conventional spin-glasses.
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