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- W2300973453 abstract "A charge density wave (CDW) transition at T CDW = 243 K and a structural phase (SP) transition at approximately 100 K occur in SrAl 4 with the BaAl 4 -type body center tetragonal structure, which is the divalent and non-4 f electron reference compound of EuAl 4 . To understand the behaviors of the CDW and SP transitions, the 27 Al NMR measurements using a single crystal and a powder sample of SrAl 4 have been carried out. The line width below T CDW is modulated by an electrical quadruple interaction between 27 Al nucleus and CDW charge modulation. The incommensurate CDW state below T CDW changes into a different structure below T SP . The temperature dependences of Knight shifts of 27 Al(I) and 27 Al(II) show the different behaviors. The temperature variation of 27 Al(I) Knight shift shows anomalies at the CDW and SP transition temperatures, revealing the shift to negative side below T CDW , which is attributable to the core polarization of the d -electrons. However, 27 Al(II) Knight shift keeps almost constant except for the small shift due to the SP transition. The 1 /T 1 T of 27 Al(I) indicates the obvious changes due to the CDW and SP transitions, while that of 27 Al(II) takes a constant value. The density of state at the Fermi level at Al(I) site below 60 K would be about 0.9 times less than that above T CDW ." @default.
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- W2300973453 date "2015-01-01" @default.
- W2300973453 modified "2023-09-30" @default.
- W2300973453 title "Studies of 27Al NMR in SrAl4" @default.
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- W2300973453 doi "https://doi.org/10.1016/j.phpro.2015.12.099" @default.
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