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首页> 外文期刊>Physica, C. Superconductivity and its applications >Soft phonons and structural phase transition in superconducting Ba _(0.59)K_(0.41)BiO_3
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Soft phonons and structural phase transition in superconducting Ba _(0.59)K_(0.41)BiO_3

机译：Ba_（0.59）K_（0.41）BiO_3中的软声子和结构相变

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摘要

We have observed a softening of phonons and a structural phase transition in a superconducting Ba_(0.59)K_(0.41)BiO_3 (T _c = 31 K) single crystal using elastic and inelastic neutron scattering measurements. The soft phonon occurs for the [1 1 1] transverse acoustic mode at the zone boundary. The phonon energies in this vicinity are found to continuously decrease with decreasing temperature from above room temperature. This softening stops at a temperature close to T_s, where a structural phase transition from cubic to tetragonal symmetry occurs. The overall results are consistent with previous data that reported phonon softening and a (0.5, 0.5, 0.5) type superstructure in several Ba_(1-x)K_xBiO_3 systems. However, we also find weaker (0.5, 0.5, 0) type superstructure peaks that reveal an additional component to the modulation. No significant change related to the superconductivity was observed for these soft phonon energies or linewidths.
机译：我们已经使用弹性和非弹性中子散射测量在超导Ba_（0.59）K_（0.41）BiO_3（T_c = 31 K）单晶中观察到了声子的软化和结构相变。软声子在区域边界处以[1 1 1]横向声模出现。发现该附近的声子能量随着温度从室温以上的降低而连续降低。该软化在接近T_s的温度处停止，在该温度下发生从立方对称到四方对称的结构相变。总体结果与以前的数据一致，以前的数据报道了在几个Ba_（1-x）K_xBiO_3系统中声子软化和（0.5，0.5，0.5）型上部结构。但是，我们还发现较弱的（0.5、0.5、0）型超结构峰，这些峰揭示了调制的其他成分。对于这些软声子能量或线宽，未观察到与超导相关的显着变化。

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