论文标题
Muon自旋放松和波动的磁性在YBA $ _ {2} $ cu $ _ {3} $ o $ $ _ {y} $的pseudogap阶段中
Muon Spin Relaxation and fluctuating magnetism in the pseudogap phase of YBa$_{2}$Cu$_{3}$O$_{y}$
论文作者
论文摘要
我们报告了MUON自旋松弛研究的结果，该研究对不足的单晶YBA $ _ {2} $ CU $ _ {3} $ o $ $ $ $ $ _ {y} $，$ y = 6.77 $和6.83 $和6.83 $ _ {3} $ _ {3} $ _ {3} $ _ {3} $ _ {3} $ _ {3} $ _ {3} $ _ {3} $ _ {3} $ _ {3} $ _ {3} $ _ {3} $ _ {3} $ _ {3} $ _ {3} $ _ {3} $ _ = 6.77 $和6.83。动态MUON自旋松弛率对应用磁场的依赖性产生了RMS幅度〜$ b \ Mathrm {_ {loc}^{rms}} $，并且在MUON网站上波动的本地田地波动的时间〜$τ_c$。观察到的放松速率不会随着pseudogap发作的降低而在$ t^\ ast $下方降低，正如常规磁性转换所期望的那样； $ b \ mathrm {_ {loc}^{rms}} $和$τ_c$在伪随阶段大致是恒定的，直到超导过渡。估计相应的NMR弛豫率太小而无法观察到。我们的结果对yba $ _ {2} $ cu $ _ {3} $ o $ $ $ _ {y} $中异常伪磁的理论施加了强烈的限制。
We report results of a muon spin relaxation study of slow magnetic fluctuations in the pseudogap phase of underdoped single-crystalline YBa$_{2}$Cu$_{3}$O$_{y}$, $y = 6.77$ and 6.83. The dependence of the dynamic muon spin relaxation rate on applied magnetic field yields the rms magnitude~$B\mathrm{_{loc}^{rms}}$ and correlation time~$τ_c$ of fluctuating local fields at muon sites. The observed relaxation rates do not decrease with decreasing temperature~$T$ below the pseudogap onset at $T^\ast$, as would be expected for a conventional magnetic transition; both $B\mathrm{_{loc}^{rms}}$ and $τ_c$ are roughly constant in the pseudogap phase down to the superconducting transition. Corresponding NMR relaxation rates are estimated to be too small to be observable. Our results put strong constraints on theories of the anomalous pseudogap magnetism in YBa$_{2}$Cu$_{3}$O$_{y}$.
