^9Be-NMR Spin-Lattice Relaxation Rate in Heavy-Fermion Superconductor UBe_<13>
^9Be-NMR Spin-Lattice Relaxation Rate in Heavy-Fermion Superconductor UBe_<13>
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^9Be-NMR 重费米子超导体 UBe_<13> 中的自旋晶格弛豫率
DOI：
10.1143/jpsjs.80sa.sa099
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
et al
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文献类型：
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作者：
K.Morita;Y.Onuki;et al
本文对Tc = 0.86K的UBe_（13）单晶进行了~ 9 Be核磁共振（NMR）测量。 在H =7 T时，当外加场平行于[001]方向时，由于核电四极相互作用，得到了分裂良好的9 Be NMR谱。当磁场方向为[111]时，Be（II）四极分裂线聚集在中心线附近.在7 T下测量了H_xO [111]的Be（I）和Be（II）位的9 Be核自旋-晶格弛豫速率.在1.5- 4K温度范围内，两个位置的1/T1 s都服从反铁磁T，表明存在反铁磁自旋涨落.在4K以上，Be（II）位的1/T_1与温度的关系较弱，而Be（I）位的1/T_1与温度无关。
9Be nuclear magnetic resonance (NMR) measurements have been carried out for a single crystal UBe13withTc=0.86 K, in order to clarify unusual properties in the normal state. For the applied field parallel to [001] direction, a well-split9Be NMR spectrum due to the nuclear electric quadrupole interaction is obtained inH=7 T. When the magnetic field is applied to [111] direction, the quadrupole split Be(II) lines gather around the central line.9Be nuclear spin–lattice relaxation rate has been measured for Be(I) and Be(II) sites forH∥[111] in 7 T. 1/T1s for both sites are found to obey √T in the temperature range of 1.5–4 K, suggesting that the antiferromagnetic spin fluctuations exist. Above 4 K, 1/T1for the Be(II) site weakly depnends on temperature, whereas that for the Be(I) site is independent of temperature.