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Dynamic Spin Fluctuations in the Frustrated A-site Spinel CuAl2O4

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arxiv 2007.04761 v1 pith:UILBBGK6 submitted 2020-07-09 cond-mat.str-el

Hwanbeom Cho , R. Nirmala , Jaehong Jeong , Peter J. Baker , Hikaru Takeda , Nobuyoshi Mera , Stephen J. Blundell , Masashi Takigawa
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D. T. Adroja Je-Geun Park
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classification cond-mat.str-el
keywords groundmagneticspinstatea-sitecual2o4dynamicfluctuations
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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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