Half-Heusler compounds UPtSn and ThPtSn: 119Sn and 195Pt NMR studies

被引：0

作者：

Grykalowska, A. ^{[1
]}

Nowak, B. ^{[1
]}

机构：

[1] W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroclaw 2, Poland

来源：

Journal of Alloys and Compounds | 2008年 / 453卷 / 1-2期

关键词：

Intrinsic magnetic susceptibilities of ThPtSn and UPtSn have been determined from the analysis of magnetisation isotherms recorded in the temperature range 1.9-300 K; and in magnetic field strengths up to 5 T. ThPtSn is found to be diamagnetic. Susceptibility data of UPtSn exhibit a cusp-like behaviour in the vicinity of 35 K and Curie-Weiss law above 150 K. Microscopic properties of UPtSn have been studied by 119Sn and 195Pt NMR Knight shift; K; and the spin-lattice relaxation rate 1 / T1 in the paramagnetic state (35 K B for 119Sn nuclei; and - 13.5 kOe/μB for 195Pt nuclei. Plots of K (T) against χ (T) for T 1 data of 195Pt nuclei is consistent with a model of electronic structure possessing an energy gap Δ = 12.3 meV and can explain the reported activated resistivity. Paramagnetic impurities act as relaxation centers in ThPtSn. Rapid spin diffusion plays an important role in 195Pt relaxation while 119Sn nuclear spins relax directly through dipole-dipole interactions with electron spins on magnetic impurities. © 2006 Elsevier B.V. All rights reserved;

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Journal article (JA)

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页码：7 / 14