Extremely Overdoped Superconducting Cuprates via High Pressure Oxygenation Methods
Extremely Overdoped Superconducting Cuprates via High Pressure Oxygenation Methods
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DOI：
10.3390/condmat6040050
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发表时间：
2021-12
期刊：
影响因子：
1.7
通讯作者：
Linda Sederholm;S. Conradson;T. Geballe;C. Jin;A. Gauzzi;E. Gilioli;M. Karppinen;G. Baldinozzi
中科院分区：
文献类型：
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作者：
Linda Sederholm;S. Conradson;T. Geballe;C. Jin;A. Gauzzi;E. Gilioli;M. Karppinen;G. Baldinozzi
在铜氧化物星座中，一个固定的星星是转变温度与CuO 2-平面中Cu上的过量电荷p的量子相图中的超导圆顶，这是由O掺杂或阳离子取代引起的。然而，对文献的更广泛的搜索表明，不应该假设在过掺杂侧有利于正常费米液体的超导性的损失。通过高压氧化制备的铜酸盐的许多实验结果表明，Tc收敛到一个固定值或继续缓慢增加，超过p = 0.26-0.27的圆顶上限，直到对应于p值0.3至> 0.6的最大过量氧。这些报告受到了冷漠或漠视。我们的综述表明，Tc的破穹趋势实际上是对大量化合物进行仔细、准确的实验工作的结果。这种行为很可能要求对高温超导性的理论基础进行修正。过量的氧原子位于晶体中特定的亚稳位置，只有在HPO条件下具有极端的O化学活性才能实现，导致超导性的这种激进扩展，这表明晶格在内部化学和键合方面发挥了更重要的作用。
Within the cuprate constellation, one fixed star has been the superconducting dome in the quantum phase diagram of transition temperature vs. the excess charge on the Cu in the CuO2-planes, p, resulting from O-doping or cation substitution. However, a more extensive search of the literature shows that the loss of the superconductivity in favor of a normal Fermi liquid on the overdoped side should not be assumed. Many experimental results from cuprates prepared by high-pressure oxygenation show Tc converging to a fixed value or continuing to slowly increase past the upper limit of the dome of p = 0.26–0.27, up to the maximum amounts of excess oxygen corresponding to p values of 0.3 to > 0.6. These reports have been met with disinterest or disregard. Our review shows that dome-breaking trends for Tc are, in fact, the result of careful, accurate experimental work on a large number of compounds. This behavior most likely mandates a revision of the theoretical basis for high-temperature superconductivity. That excess O atoms located in specific, metastable sites in the crystal, attainable only with extreme O chemical activity under HPO conditions, cause such a radical extension of the superconductivity points to a much more substantial role for the lattice in terms of internal chemistry and bonding.