Electronic liquid crystal state in the high-temperature superconductor YBa2Cu3O6.45
Electronic liquid crystal state in the high-temperature superconductor YBa2Cu3O6.45
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DOI：
10.1126/science.1152309
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发表时间：
2008-02-01
期刊：
影响因子：
56.9
通讯作者：
Keimer, B.
中科院分区：
文献类型：
--
作者：
Hinkov, V.;Haug, D.;Keimer, B.
最近在半导体异质结构和金属氧化物的毫克尔文温度下的输运实验中，发现了与传统液晶的对称性相匹配的电子相。我们报道了高温超导体YBa2Cu3O6.45在150开尔文以下冷却时，自旋系统的一维无公度调制的自发开始，而在2开尔文以上没有静态磁序。这种调制随温度和掺杂的演化与电阻率的面内各向异性的演化平行，表明电子向列相在较宽的温度范围内是稳定的。结果表明，软自旋涨落是电子液晶的微观途径，向列相有序可以与低掺杂铜酸盐的高温超导电性共存。
Electronic phases with symmetry properties matching those of conventional liquid crystals have recently been discovered in transport experiments on semiconductor heterostructures and metal oxides at millikelvin temperatures. We report the spontaneous onset of a one- dimensional, incommensurate modulation of the spin system in the high- transition- temperature superconductor YBa2Cu3O6.45 upon cooling below similar to 150 kelvin, whereas static magnetic order is absent above 2 kelvin. The evolution of this modulation with temperature and doping parallels that of the in- plane anisotropy of the resistivity, indicating an electronic nematic phase that is stable over a wide temperature range. The results suggest that soft spin fluctuations are a microscopic route toward electronic liquid crystals and that nematic order can coexist with high- temperature superconductivity in underdoped cuprates.