MAGNETIC EXCITATIONS AND ORDERING IN THE HEAVY-ELECTRON SUPERCONDUCTOR URU2SI2
MAGNETIC EXCITATIONS AND ORDERING IN THE HEAVY-ELECTRON SUPERCONDUCTOR URU2SI2
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DOI：
10.1103/physrevlett.58.1467
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发表时间：
1987-04-06
影响因子：
8.6
通讯作者：
MYDOSH, JA
中科院分区：
文献类型：
--
作者：
BROHOLM, C;KJEMS, JK;MYDOSH, JA
中子散射证明了重电子体系u2si2在1k以下存在反铁磁有序和超导性。发现上（17.5 K）跃迁到具有（100）调制波矢量的反铁磁相，并沿四方c轴自旋。有序矩异常小，为（0.03±0.01）μ b。然而，自旋波是由阻尼的有限间隙激励在T N以上产生的，它们是强烈的、传播的、纵向的，带中心间隙为1.8 meV。
Neutron scattering demonstrates the coexistence of antiferromagnetic order and superconductivity below 1 K in the heavy-electron system URu 2 Si 2. It is found that the upper (17.5 K) transition is to an antiferromagnetic phase with a (100) modulation wave vector and spins along the tetragonal c-axis. The ordered moment is unusually small,(0.03±0.01) μ B. However, spin waves develop from damped, finite-gap excitations above T N, and they are intense, propagating, and longitudinal with a zone centre gap of 1.8 meV.