Abstract
We present the results of \(^{\varvec{27}}\)Al-nuclear magnetic resonance (NMR) studies of Si-substituted PrTi\(_{\varvec{2}}\)Al\(_{\varvec{20}}\) in order to clarify the magnetic and electronic properties at low temperatures and the change by Si substitution for Al from a microscopic point of view. From the analyses of the Knight shift, the hyperfine coupling constants on \(^{\varvec{27}}\)Al in PrTi\(_{\varvec{2}}\)(Si\(_{\varvec{0.1}}\)Al\(_{\varvec{0.9}}\))\(_{\varvec{20}}\) are slightly larger than those of PrTi\(_{\varvec{2}}\)Al\(_{\varvec{20}}\). The nuclear spin-lattice relaxation rate \(\varvec{1/T_1}\) does not exhibit any anomaly around 2.0 K, in contrast to the results associated with the quadrupolar ordering in PrTi\(_{\varvec{2}}\)Al\(_{\varvec{20}}\). The analysis of \(\varvec{1/T_1}\) at high temperatures reveals that the \(\varvec{c}\)–\(\varvec{f}\) hybridization may be reduced by Si substitution for Al.
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No datasets were generated or analysed during the current study.
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Acknowledgements
We thank Prof. K. Nakamura for experimental support under high magnetic field. We also thank Technology Center for Regional R & D, Tokushima University.
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K.M. wrote the main manuscript text and prepared all figures. H.S. made NMR/NQR experiments. A.H. and Y.K. discussed the results and supported the experiments. T.K. made the magnetic susceptibility and the specific heat measurements. All authors reviewed the manuscript.
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Magishi, Ki., Sugiura, H., Hisada, A. et al. NMR study of Si-substitution effect for Al in PrTi\(_2\)Al\(_{20}\). Hyperfine Interact 245, 11 (2024). https://doi.org/10.1007/s10751-024-01853-w
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DOI: https://doi.org/10.1007/s10751-024-01853-w