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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Synchrotron X-ray diffraction studies of magnetic materials under extreme conditions
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Synchrotron X-ray diffraction studies of magnetic materials under extreme conditions

机译：极端条件下磁性材料的同步辐射X射线衍射研究

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The synchrotron X-Ray diffraction studies of magnetic materials under extreme conditions performed at the beam-line BL19LXU at SPring-8 are reviewed. After a description of the experimental setup. we report recent results of non-resonant X-ray magnetic and charge scattering measurements on some antiferromagnets obtained in high magnetic fields and low temperatures. The first result is the observation of the spin-flop transition in the prototypical uniaxial antiferromagnet MnF2 and we find that the intensity of the magnetic X-ray diffraction depends on the angle the magnetic moment in the sample makes with the scattering vector. The second result is the synchrotron X-ray diffraction measurement of the high field phase of a spin-Peierls system. We have measured the X-ray diffraction by CuGeO3 in magnetic field, H, up to 15T. We find that the temperature, T, dependence of the incommensurate peak is quite different at lower H from that at higher H At magnetic fields slightly above the critical field, H-SP, for the commensurate to incommensurate transition, the incommensurability, deltal, depends much on T, whereas at H well above H-SP, deltal is almost independent of T. We interpret this finding as due to a stabilization of the incommensurate state by a strong magnetic field which suppresses thermal fluctuations. The third one is the synchrotron X-ray diffraction measurement at a very low temperature. We have observed a jump in the lattice constant of the ladder-like compound Cu-2(C5H12N2)(2)Cl-4 at about 40 mK associated with the field induced magnetic ordering from the non-magnetic spin-liquid state. This is the first experimental confirmation of the theoretical prediction on the generalized spin-Peierls phenomenon in quantum magnets.
机译：综述了在SPring-8光束线BL19LXU上在极端条件下对磁性材料进行的同步X射线衍射研究。经过实验设置的说明。我们报告了在高磁场和低温下获得的一些反铁磁体的非共振X射线磁性和电荷散射测量的最新结果。第一个结果是观察到典型的单轴反铁磁体MnF2中的自旋跃迁跃迁，我们发现磁X射线衍射的强度取决于样品中磁矩与散射矢量所成的角度。第二个结果是自旋Peierls系统高场相的同步加速器X射线衍射测量。我们已经测量了CuGeO3在磁场H下（最高15T）的X射线衍射。我们发现，在较低的H处，与较高的H处的不相称峰的温度T的依赖性大不相同。在磁场略高于临界场H-SP的磁场中，从相称到不相称的过渡，不可相称性取决于在T上有很多，而在H远高于H-SP时，delta几乎与T无关。我们将此发现解释为是由于抑制磁场波动的强磁场稳定了不相称的状态。第三个是在非常低的温度下进行的同步加速器X射线衍射测量。我们已经观察到梯形化合物Cu-2（C5H12N2）（2）Cl-4的晶格常数在大约40 mK处发生跳跃，这与非磁性自旋液体状态下的磁场感应磁序有关。这是对量子磁体中广义自旋Peierls现象的理论预测的第一个实验确认。

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