Novel in-gap spin state in Zn-doped La1.85Sr0.15CuO4 -: art. no. 067002
Novel in-gap spin state in Zn-doped La1.85Sr0.15CuO4 -: art. no. 067002
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DOI：
10.1103/physrevlett.91.067002
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发表时间：
2003-08-08
影响因子：
8.6
通讯作者：
Hirota, K
中科院分区：
文献类型：
--
作者：
Kimura, H;Kofu, M;Hirota, K
用中子散射法研究了La1.85Sr0.15Cu1-yZnyO4的低能自旋激发。在y=0.004时，不相称的磁峰在T-c以下表现出明确的“自旋间隙”。当y=0.008时，ω =3 meV处的磁信号在T-c=27 K以下下降，也表明磁隙打开。然而，在较低的温度下，信号再次增加，这意味着一种新的隙内自旋状态。在y=0.017时，自旋间隙消失，出现弹性磁峰。这些结果表明，随着Zn的增加，掺杂Zn杂质诱导了新的隙内态，隙内态变得更大，更静态。
Low-energy spin excitations of La1.85Sr0.15Cu1-yZnyO4 were studied by neutron scattering. In y=0.004, the incommensurate magnetic peaks show a well-defined "spin gap" below T-c. The magnetic signals at omega=3 meV decrease below T-c=27 K for y=0.008, also suggesting the gap opening. At lower temperatures, however, the signal increases again, implying a novel in-gap spin state. In y=0.017, the spin gap vanishes and elastic magnetic peaks appear. These results clarify that doped Zn impurities induce the novel in-gap state, which becomes larger and more static with increasing Zn.