论文标题
在bi $ _ {2+x} $ _ {2+x} $ sr $ _ {2-x} $ CACU $ _2 $ _2 $ o $ _ {8+Δ} $的pseudoGap阶段中，没有$μ$ $ SR的磁性订单证据
Absence of $μ$SR evidence for magnetic order in the pseudogap phase of Bi$_{2+x}$Sr$_{2-x}$CaCu$_2$O$_{8+δ}$
论文作者
论文摘要
我们提出了一项长期零场哑光旋转放松（ZF- $ $ $ SR）的研究，该研究对过多的BI $ _ {2+X} $ sr $ _ {2-x} $ _2 $ _2 $ _2 $ _2 $ o $ _ {8+Δ} $（BI2212）$ nife $ nife $ quastion jasived quastiasity的启用eartiasity的原始序列，以前最佳掺杂和过量样品的超导和正常状态。重量重量的单晶的新结果显示，单调降低的ZF- $ $ $ SR松弛率，温度升高，持续的温度持续高于PseudoGap（PG）温度$ T^*$，并且不会随孔掺杂而演变（$ P $）。使用超低背景设备的其他测量确认，这种行为是BI2212的内在特性，这不能归因于与PG相相关的磁顺序。取而代之的是，我们表明温度依赖性松弛速率很可能是由于结构变化引起的，从而改变了核偶极场对ZF-$ $ $ $ SR信号的贡献。我们在BI2212上的结果强调了不假设核偶极场贡献的重要性与Zf- $ $ $ $ $ SR的高温研究（高温（高-T_C $）cuprate cuprate超导体研究无关 阶段。
We present an extended zero-field muon spin relaxation (ZF-$μ$SR) study of overdoped Bi$_{2+x}$Sr$_{2-x}$CaCu$_2$O$_{8+δ}$ (Bi2212) single crystals, intended to elucidate the origin of weak quasistatic magnetism previously detected by $μ$SR in the superconducting and normal states of optimally-doped and overdoped samples. New results on heavily-overdoped single crystals show a similar monotonically decreasing ZF-$μ$SR relaxation rate with increasing temperature that persists above the pseudogap (PG) temperature $T^*$ and does not evolve with hole doping ($p$). Additional measurements using an ultra-low background apparatus confirm that this behavior is an intrinsic property of Bi2212, which cannot be due to magnetic order associated with the PG phase. Instead we show that the temperature-dependent relaxation rate is most likely caused by structural changes that modify the contribution of the nuclear dipole fields to the ZF-$μ$SR signal. Our results for Bi2212 emphasize the importance of not assuming the nuclear-dipole field contribution is independent of temperature in ZF-$μ$SR studies of high-temperature (high-$T_c$) cuprate superconductors, and do not support a recent $μ$SR study of YBa$_2$Cu$_3$O$_{6+x}$ that claims to detect magnetic order in the PG phase.
