NMR and NQR studies of magnetism and superconductivity in the antiferromagnetic heavy fermion superconductors UM2Al3 (M=Ni and Pd)
NMR and NQR studies of magnetism and superconductivity in the antiferromagnetic heavy fermion superconductors UM2Al3 (M=Ni and Pd)
复制标题
反铁磁重费米子超导体 UM2Al3（M=Ni 和 Pd）中磁性和超导性的 NMR 和 NQR 研究
DOI：
10.1143/jpsj.62.4016
复制
发表时间：
1993
影响因子：
1.7
通讯作者：
F. Steglich
中科院分区：
文献类型：
--
作者：
M. Kyogaku;Y. Kitaoka;K. Asayama;C. Geibel;C. Schank;F. Steglich
利用27al NMR和NQR对新型重费米子超导体uni2al - 3和upd2al - 3的磁性和超导特性进行了广泛的研究。对27 Al的核自旋晶格弛豫时间t1、奈特位移和谱的系统研究揭示了这两种化合物之间不同类型的磁波动和自旋结构。upd2al3属于重费米子反铁磁体，具有普通大小的u -导矩。在超导状态下，upd2al3的弛豫行为与迄今为止报道的其他HFS中观察到的相似，为费米表面上具有间隙零线的非常规各向异性超导性提供了证据。发现奈特位移在温度以下显著减小，表明伪自旋定义良好，不受杂质散射的影响。
Both magnetic and superconducting characteristics of the new heavy fermion superconductors (HFS), UNi 2 Al 3 and UPd 2 Al 3 have been investigated extensively by means of 27 Al NMR and NQR. Systematic studies of the nuclear-spin-lattice relaxation time T 1 , the Knight shift and the spectrum of 27 Al have revealed different types of magnetic fluctuations and spin structure between these two compounds. UNi 2 Al 3 shows a band-type itinerant antiferromagnetic behavior, while UPd 2 Al 3 belongs to a heavy fermion antiferromagnet with an ordinary size of U-derived moment. In the superconducting state, the relaxation behavior in UPd 2 Al 3 is similar to those observed in the other HFS reported so far, providing an evidence for an unconventional anisotropic superconductivity with line of gap zeros on the Fermi surface as well. Knight shift has been found to decrease considerably below T c , showing that the pseudo spin is well defined, not affected by the impurity scattering.
新型重费米子超导体CePt_3Si的NMR研究
DOI：
--
发表时间：
--
期刊：
Physica B (to be published)
影响因子：
--
作者：
K.Ueda;T.Kohara;G.Motoyama;Y.Oda
通讯作者：
Y.Oda