Atomic disorder in the heavy fermion superconductor CeCu{sub 2+x}Si
Atomic disorder in the heavy fermion superconductor CeCu{sub 2+x}Si
复制标题
重费米子超导体 CeCu{sub 2 x}Si 中的原子无序
DOI：
10.1103/physrevb.61.r14940
复制
发表时间：
2000
影响因子：
3.7
通讯作者：
G. Kwei
中科院分区：
文献类型：
--
作者：
D. Louca;J. Thompson;J. Lawrence;R. Movshovich;C. Petrovic;J. Sarrao;G. Kwei
超导，磁性和非费米液体类基态在CeCu{sub 2+x}Si{sub 2}中演化，其中Ce/Cu比的微小变化使平均晶体结构保持不变。然而，我们发现，由中子对密度函数分析确定的超导样品（x=0.33）的局部原子结构是从根本上不同于非超导样品（x=-0.08）。铜缺乏的样品的本地晶格表现出长程原子秩序，而富铜样品是内在无序的。无序晶格中的自旋-晶格耦合产生不均匀的磁性状态，这使得超导性得以发展，并可能有助于观察到的非费米液体效应。(c)2000年，美国物理学会。
Superconducting, magnetic, and non-Fermi-liquid-like ground states evolve in CeCu{sub 2+x}Si{sub 2} with small changes in the Ce/Cu ratio that leave the average crystal structure unchanged. We find, however, that the local atomic structure determined by neutron pair density function analysis for a superconducting sample with x=0.33 is fundamentally different from a nonsuperconducting sample with x=-0.08. The local lattice of the Cu-deficient sample exhibits long-range atomic order, while the Cu-rich sample is intrinsically disordered. Spin-lattice coupling in the disordered lattice produces an inhomogeneous magnetic state that allows superconductivity to develop and may contribute to observed non-Fermi-liquid effects. (c) 2000 The American Physical Society.