Muon-spin-relaxation investigation of the spin dynamics of geometrically frustrated chromium spinels
Muon-spin-relaxation investigation of the spin dynamics of geometrically frustrated chromium spinels
复制标题
几何受挫铬尖晶石自旋动力学的μ子自旋弛豫研究
DOI：
10.1103/physrevb.66.174434
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发表时间：
2002
影响因子：
3.7
通讯作者：
A. Savici
中科院分区：
文献类型：
--
作者：
M. Rovers;P. Kyriakou;H. Da̧bkowska;G. Luke;M. Larkin;A. Savici
dc magnetic susceptibility $(\ensuremath{\chi})$ and muon-spin-relaxation measurements $(\ensuremath{\mu}\mathrm{SR})$ on the geometrically frustrated systems ${\mathrm{MgCr}}_{2}{\mathrm{O}}_{4}$ and ${\mathrm{CdCr}}_{2}{\mathrm{O}}_{4}$ indicate a transition from a paramagnetic state to a quasistatic spin state at 12.5 K and 7.8 K, respectively. Comparison of low-temperature field strength measured by $\ensuremath{\mu}\mathrm{SR}$ to that predicted by a dipole model suggests that only about 15% of the spin is static on the muon time scale. We observe slow spin fluctuations persisting to millikelvin temperatures, indicating that extremely low-energy magnetic excitations are present in these materials to the lowest temperatures. Our results demonstrate that substantial magnetic frustration remains, in spite of the tetragonal distortion occurring at ${T}_{N}.$
dc magnetic susceptibility $(\ensuremath{\chi})$ and muon-spin-relaxation measurements $(\ensuremath{\mu}\mathrm{SR})$ on the geometrically frustrated systems ${\mathrm{MgCr}}_{2}{\mathrm{O}}_{4}$ and ${\mathrm{CdCr}}_{2}{\mathrm{O}}_{4}$ indicate a transition from a paramagnetic state to a quasistatic spin state at 12.5 K and 7.8 K, respectively. Comparison of low-temperature field strength measured by $\ensuremath{\mu}\mathrm{SR}$ to that predicted by a dipole model suggests that only about 15% of the spin is static on the muon time scale. We observe slow spin fluctuations persisting to millikelvin temperatures, indicating that extremely low-energy magnetic excitations are present in these materials to the lowest temperatures. Our results demonstrate that substantial magnetic frustration remains, in spite of the tetragonal distortion occurring at ${T}_{N}.$