Microscopic Phase Separation in Triangular-Lattice Quantum Spin Magnet κ-(BEDT-TTF)2Cu2(CN)3 Probed by Muon Spin Relaxation
Microscopic Phase Separation in Triangular-Lattice Quantum Spin Magnet κ-(BEDT-TTF)2Cu2(CN)3 Probed by Muon Spin Relaxation
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DOI：
10.1143/jpsj.81.063706
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发表时间：
2012-06-01
影响因子：
1.7
通讯作者：
Sasaki, Takahiko
中科院分区：
文献类型：
--
作者：
Nakajima, Saori;Suzuki, Takao;Sasaki, Takahiko
量子自旋系统 kappa-(BEDT-TTF)(2)Cu-2(CN)(3) 的基态，其中反铁磁相互作用的 S = 1/2 自旋位于近等边三角形晶格上，引起了实验和理论方面的极大兴趣，因为简单的反铁磁有序可能由于几何挫败而受到抑制，因此， 预计会有奇异的基态。此外，最近关于该系统基态的两份报告通过显示完全有争议的结果而增加了人们的兴趣：一份表明无间隙状态，另一份表明有间隙状态。通过利用μ SR显微探针，我们研究了其0.1 K以下的自旋动力学，揭示了其在零场下的微观相分离基态。
The ground state of the quantum spin system kappa-(BEDT-TTF)(2)Cu-2(CN)(3), in which antiferromagnetically interacting S = 1/2 spins are located on a nearly equilateral triangular lattice, attracts considerable interest from both experimental and theoretical aspects, because a simple antiferromagnetic order may be inhibited owing to geometrical frustration, and hence, an exotic ground state is expected. Furthermore, two recent reports on the ground state of this system have increased the intrigue by showing completely controversial results: one indicates the gapless state and the other the gapped state. By utilizing the mu SR microscopic probe, we have investigated its spin dynamics below 0.1 K, unveiling its microscopically phase-separated ground state at zero field.