Distinct Fe-induced magnetic states in the underdoped and overdoped regimes of La2-xSrxCu1-yFeyO4 revealed by muon spin relaxation
Distinct Fe-induced magnetic states in the underdoped and overdoped regimes of La2-xSrxCu1-yFeyO4 revealed by muon spin relaxation
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DOI：
10.1103/physrevb.86.014522
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发表时间：
2012-07-27
影响因子：
3.7
通讯作者：
Watanabe, I.
中科院分区：
文献类型：
--
作者：
Suzuki, K. M.;Adachi, T.;Watanabe, I.
在宽的空穴浓度范围内，对部分Fe取代的La_（2-x）Sr_xCu_（1-y）Fe_yO_4进行了零场和双场μ子自旋弛豫测量，以研究最近从中子散射测量中提出的Fe取代引起的磁态[R.- H. He等人，物理修订信函107，127002（2011）]。结果表明，在无Fe的La_（2-x）Sr_xCuO_4中，在很宽的空穴浓度范围内，Fe的取代显著提高了磁性转变温度，使其具有超导电性。在欠掺杂的制度，铁诱导的磁秩序可以理解的概念，由铁的条纹钉扎的情况下的Zn诱导的La 2-xSrxCu 1-yZnyO 4。在过掺杂制度，另一方面，铁诱导的磁秩序是短程的，这是从条纹不同。在La-214高Tc铜氧化物中，由于Ruderman-Kittel-Kasuya-Yosida相互作用而产生的Fe自旋在过掺杂区可能是自旋玻璃态，表明空穴掺杂使基态从强关联态转变为费米液态.
Zero-field and longitudinal-field muon-spin-relaxation measurements have been performed in partially Fe-substituted La2-xSrxCu1-yFeyO4 in a wide range of hole concentration to investigate the magnetic state induced by the Fe substitution recently suggested from the neutron-scattering measurements [R.-H. He et al., Phys. Rev. Lett. 107, 127002 (2011)]. It has been found that the magnetic transition temperature is notably enhanced through the 1% Fe substitution in a wide range of hole concentration where superconductivity appears in Fe-free La2-xSrxCuO4. In the underdoped regime, the Fe-induced magnetic order can be understood in terms of the concept of stripe pinning by Fe as in the case of the Zn-induced one in La2-xSrxCu1-yZnyO4. In the overdoped regime, on the other hand, the Fe-induced magnetic order is short-ranged, which is distinct from the stripes. It is plausible that a spin-glass state of Fe spins derived from the Ruderman-Kittel-Kasuya-Yosida interaction is realized in the overdoped regime, suggesting a change of the ground state from the strongly correlated state to the Fermi-liquid state with hole doping in La-214 high-T-c cuprates.