Institute for Solid State Physics, TU Dresden, D-01069 Dresden, Germany.
J Phys Condens Matter. 2013 Sep 11;25(36):365601. doi: 10.1088/0953-8984/25/36/365601. Epub 2013 Aug 8.
We report zero and longitudinal magnetic field muon spin relaxation (μSR) measurements of the spin S = 1/2 antiferromagnetic Heisenberg chain material SrCuO2. We find that in a weak applied magnetic field B0 the spin-lattice relaxation rate λ follows a power law λ is proportional to B(0)(-n) with n = 0.9(3). This result is temperature independent for 5 K ≤ T ≤ 300 K. Within conformal field theory and using the Müller ansatz we conclude ballistic spin transport in SrCuO2.
我们报告了零场和纵向磁场μ子自旋弛豫（μSR）测量自旋 S = 1/2 反铁磁海森堡链材料 SrCuO2 的结果。我们发现，在较弱的外磁场 B0 下，自旋晶格弛豫率 λ 遵循幂律 λ∝B(0)(-n)，其中 n = 0.9(3)。在 5 K ≤ T ≤ 300 K 的温度范围内，该结果与温度无关。根据共形场理论并使用 Müller 假设，我们得出结论，SrCuO2 中存在弹道自旋输运。
