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• W2028856613 abstract "We report Si-NMR studies on the magnetic property of pressure-induced superconductors ${mathrm{CePd}}_{2}{mathrm{Si}}_{2}$ and ${mathrm{CeRh}}_{2}{mathrm{Si}}_{2},$ which exhibit antiferromagnetic (AF) order with the N'eel temperature ${T}_{mathrm{N}}=10$ K and 36 K at ambient pressure, respectively. The NMR results in ${mathrm{CePd}}_{2}{mathrm{Si}}_{2}$ are consistent with those obtained from the previous neutron-diffraction (ND) experiments. On the other hand, the NMR study in oriented powder ${mathrm{CeRh}}_{2}{mathrm{Si}}_{2}$ has revealed that the spectrum splits into two peaks due to the onset of the AF order with the wave vector of ${mathit{q}}_{1}=(1/21/20)$ below ${T}_{mathrm{N}1}=36 mathrm{K}$ and each peak splits further into two peaks below ${T}_{mathrm{N}2}=25 mathrm{K}$ due to the formation of AF domains with ${mathit{q}}_{2}=(1/21/21/2).$ The saturation moment ${M}_{mathrm{AF}}(mathrm{NMR})=0.36$ and $0.22{ensuremath{mu}}_{mathrm{B}}$ estimated from NMR are significantly smaller than ${M}_{mathrm{AF}}(mathrm{ND})=1.86$ and $1.69{ensuremath{mu}}_{mathrm{B}}$ from ND. From this discrepancy in the sizes of ${M}_{mathrm{AF}},$ it is proposed that a correlation time in fluctuations of f-electron moments is longer than the characteristic time of observation for thermal neutrons but shorter than that for NMR. This probe dependence of ${M}_{mathrm{AF}}$ was observed in the uranium heavy-fermion (HF) compounds ${mathrm{UPt}}_{3}$ and ${mathrm{URu}}_{2}{mathrm{Si}}_{2}.$ From the temperature dependence of the nuclear spin-lattice relaxation rate ${1/T}_{1}$ in the paramagnetic state, the Kondo temperature ${T}_{mathrm{K}}$ in ${mathrm{CeRh}}_{2}{mathrm{Si}}_{2}$ is estimated to be around $ensuremath{sim}100 mathrm{K},$ much higher than ${T}_{mathrm{K}}ensuremath{sim}12 mathrm{K}$ in ${mathrm{CePd}}_{2}{mathrm{Si}}_{2}.$ The ${1/T}_{1}$'s in both the compounds decrease markedly below ${T}_{mathrm{N}},$ followed by a ${T}_{1}T=$ constant behavior far below ${T}_{mathrm{N}}.$ From the latter result, it is suggested that low-lying excitations at low temperatures are dominated by quasiparticle excitations in the AF ordered state in ${mathrm{CePd}}_{2}{mathrm{Si}}_{2}$ and ${mathrm{CeRh}}_{2}{mathrm{Si}}_{2}.$" @default.
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• W2028856613 title "Si-NMR study of antiferromagnetic heavy-fermion compounds<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CePd</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Si</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=…" @default.
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• W2028856613 doi "https://doi.org/10.1103/physrevb.58.8634" @default.
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