Nuclear Magnetic Relaxation in Palladium
Nuclear Magnetic Relaxation in Palladium
复制标题
钯的核磁弛豫
DOI：
10.1143/jpsj.51.787
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发表时间：
1982
影响因子：
1.7
通讯作者：
H. Yasuoka
中科院分区：
文献类型：
--
作者：
M. Takigawa;H. Yasuoka
在4.2 ~ 300 K温度范围内，测量了105个Pd原子核的Knight位移和自旋-晶格弛豫速率（1/T1）。由Knight位移测量得到的纤芯极化超精细场为-（3.39±0.03）× 105 Oe/μ B . 1/T1与温度成正比，在150 K以下，1/（T1 T）=1.35±0.03 sec-1 K-1，而在较高温度下，1/T1开始偏离这种关系，变为较小的值。由于d-电子自旋的弛豫速率，（1/T1）d，通过从测量的1/T1减去其他贡献的估计值得到。由（1/T1）d的值和温度依赖关系可知，在整个温度范围内，（1/T1）主要由自旋涨落的长波长分量决定。
The Knight shift and the nuclear spin-lattice relaxation rate (1/ T 1 ) of 105 Pd nuclei has been measured in an exchange-enhanced paramagnet Pd metal, in the temperature range between 4.2 and 300 K. Frorn the Knight shift measurement the core polarization hyperfine field is obtained to be -(3.39±0.03)×10 5 Oe/µ B . 1/ T 1 is proportional to temperature with the value, 1/( T 1 T )=1.35±0.03 sec -1 K -1 , below about 150 K, while 1/ T 1 begins to deviate from this relation to smaller values at higher temperature. Relaxation rate due to d-electron spin, (1/ T 1 ) d , was obtained by subtracting the estimated values of other contributions from measured 1/ T 1 . Frorn the value and the temperature dependence of (1/ T 1 ) d , we conclude that (1/ T 1 ) is mostly determined by the long wavelength component of the spin fluctuation in the whole temperature range.