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首页> 外文期刊>Physica, B. Condensed Matter >Spin density and non-collinear magnetization in frustrated pyrochlore Tb2Ti2O7 from polarized neutron scattering
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Spin density and non-collinear magnetization in frustrated pyrochlore Tb2Ti2O7 from polarized neutron scattering

机译：极化中子散射对受阻烧绿石Tb2Ti2O7的自旋密度和非共线磁化强度

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摘要

We used a local susceptibility approach in extensive polarized neutron diffraction studies of the spin liquid Tb2Ti2O7. For a magnetic field applied along the [110] and [111] directions, we found that, at high temperature, all Tb moments are collinear and parallel to the field. With decreasing temperature, the Tb moments reorient from the field direction to their local anisotropy axes. For the 11101 field direction, the field induced magnetic structure at 10 K is spin ice-like, but with two types of Tb moments of very different magnitudes. For a field along [111], the magnetic structure resembles the so-called "one in-three out" found in spin ices, with the difference that all Tb moments have an additional component along the [111] direction due to the magnetic field. The temperature evolution of the local susceptibilities clearly demonstrates a progressive change from Heisenberg to Ising behavior of the Tb moments when lowering the temperature, which appears to be a crystal field effect.
机译：我们在自旋液体Tb2Ti2O7的广泛极化中子衍射研究中使用了局部磁化率方法。对于沿[110]和[111]方向施加的磁场，我们发现，在高温下，所有Tb矩都是共线的并且与磁场平行。随着温度的降低，Tb矩从磁场方向重新定向到其局部各向异性轴。对于11101磁场方向，在10 K时的磁场感应磁结构呈自旋冰状，但具有两种类型的Tb矩，其幅度相差很大。对于沿[111]的磁场，磁性结构类似于在自旋冰中发现的所谓的“一进三出”，不同之处在于，由于磁场的作用，所有Tb矩沿[111]方向都具有附加分量。局部磁化率的温度演化清楚地表明，当降低温度时，Tb矩从海森堡向伊辛行为逐渐变化，这似乎是晶场效应。

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