Muon spin relaxation detection of the soft mode toward the exotic magnetic ground state in the bond-disordered quantum spin system IPA-Cu(Cl0.35Br0.65)3
Muon spin relaxation detection of the soft mode toward the exotic magnetic ground state in the bond-disordered quantum spin system IPA-Cu(Cl0.35Br0.65)3
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键无序量子自旋系统IPA-Cu(Cl0.35Br0.65)3中软模式朝向奇异磁性基态的μ子自旋弛豫检测
DOI：
10.1103/physrevb.78.054422
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发表时间：
2008
影响因子：
3.7
通讯作者：
H. Manaka
中科院分区：
文献类型：
--
作者：
T. Goto;Takao Suzuki;K. Kanada;T. Saito;A. Oosawa;I. Watanabe;H. Manaka
通过对宏观的均匀磁化率和比热的实验，报道了具有键无序${({\text{CH}}_{3})}_{2}{\text{CHNH}}_{3}\text{-Cu}{({\text{Cl}}_{x}{\text{Br}}_{1\ensuremath{-}x})}_{3}$的自旋能隙系统在低温下(当$x$的值在0.44和0.87)，否则是有间隙的行为。我们用介子自旋弛豫方法研究了x=0.35的样品的基态，观察到随着温度的降低，自旋涨落的频谱趋于零能附近。这一行为被解释为在绝对零度时向可能的磁相变方向的软模。
The spin-gap system with a bond-disorder ${({\text{CH}}_{3})}_{2}{\text{CHNH}}_{3}\text{-Cu}{({\text{Cl}}_{x}{\text{Br}}_{1\ensuremath{-}x})}_{3}$ is reported by experiments on macroscopic quantities of the uniform susceptibility and the specific heat to show a magnetic order at low temperatures (when the value of $x$ is within the limited region between 0.44 and 0.87) and otherwise a gapped behavior. We have investigated microscopically the ground state of the sample with $x=0.35$ by muon spin relaxation $(\ensuremath{\mu}\text{SR})$ to observe that the frequency spectrum of the spin fluctuation tends to concentrate around zero energy as lowering temperatures. This behavior was interpreted as the soft mode toward the possible magnetic phase transition at absolute zero.