Microscopic Phase Separation in Triangular-Lattice Quantum Spin Magnet κ-(BEDT-TTF)2Cu2(CN)3 Probed by Muon Spin Relaxation

被引:35
|
作者
Nakajima, Saori [1 ]
Suzuki, Takao [2 ,3 ]
Ishii, Yasuyuki [2 ]
Ohishi, Kazuki [2 ]
Watanabe, Isao [2 ]
Goto, Takayuki [1 ]
Oosawa, Akira [1 ]
Yoneyama, Naoki [5 ,6 ]
Kobayashi, Norio [5 ]
Pratt, Francis L. [4 ]
Sasaki, Takahiko [5 ,6 ]
机构
[1] Sophia Univ, Fac Sci & Technol, Div Phys, Chiyoda Ku, Tokyo 1028554, Japan
[2] RIKEN Nishina Ctr Accelerator Based Sci, Adv Meson Sci Lab, Wako, Saitama 3510198, Japan
[3] Shibaura Inst Technol, Coll Engn, Saitama 3378570, Japan
[4] STFC Rutherford Appleton Lab, ISIS Facil, Chilton OX11 0QX, Oxon, England
[5] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[6] CREST, Japan Sci & Technol Agcy, Chiyoda Ku, Tokyo 1020075, Japan
关键词
triangular lattice; frustration; mu SR; quantum spin antiferromagnet; organic superconductors; CHAIN SYSTEM KCUCL3; LIQUID-STATE;
D O I
10.1143/JPSJ.81.063706
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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.
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页数:4
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