SUPERCONDUCTIVITY AND MAGNETISM OF THE NEW HEAVY FERMION SUPERCONDUCTORS UM2AL3 (M = NI, PD) - AL-27 NMR-STUDY

被引：24

作者：

KYOGAKU, M ^{[1
]}

KITAOKA, Y ^{[1
]}

ASAYAMA, K ^{[1
]}

GEIBEL, C ^{[1
]}

SCHANK, C ^{[1
]}

STEGLICH, F ^{[1
]}

机构：

[1] TH DARMSTADT,INST FESTKORPERPHYS,W-6100 DARMSTADT,GERMANY

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1992年 / 61卷 / 08期

关键词：

D O I：

10.1143/JPSJ.61.2660

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The magnetic and superconducting properties of the new heavy fermion superconductors (HFS), UNi2Al3 and UPd2Al3 have been investigated by Al-27 NMR. The magnetic ordering is unambiguously identified by a significant increase of Al-27 linewidth below T(N) = 4.6 K and an enhancement of the nuclear-spin-lattice relaxation rate 27(1 / Tl) around T(N) in UNi2Al3 and by a gradual increase of the linewidth and a distinct drop of 27(1 / Tl) below T(N) = 14 K in UPd2Al3. Below T(c) = 0.9 K in a magnetic field of 2.8 kOe, no anomalies of 1 / Tl and Knight shift have been observed in UNi2Al3, whereas the superconductivity in UPd2Al3 is well evidenced by a significant decrease of both 1 / Tl and Knight shift below T(c) = 1.8 K in 4.9 kOe. The behavior of 1 / Tl in UPd2Al3, with no coherence peak just below T(c), is well described down to 0.65 K by a model of gap zeros on lines at the Fermi surface, being quite similar to the behavior in HFS reported thus far.

引用

页码：2660 / 2664

页数：5