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Implications for the origin of the pseudogap: Microwave spectroscopy of PrBa_2Cu_4O_8

机译：假间隙起源的含义：PrBa_2Cu_4O_8的微波光谱

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Using techniques of microwave spectroscopy at 13 GHz, we have observed antiferromagnetic resonance arising from the magnetically ordered cuprate planes of conducting PrBa_2Cu_4O_8; the Cu Neel temperature is approximately 80 K. In addition, we have detected a Cu electron spin resonance which is due either to Cu in chain fragments or more likely to Cu in a minority impurity phase, BaCuO_2, a phase also detected by x-ray diffraction. Although this sample was conducting to the lowest temperatures, no indication of even granular superconductivity was detected. The c-axis parameter of PrBa_2Cu_4O_8 is dependent on processing and varies more than in other Lnl24 materials; we propose that the lack of superconductivity is a consequence of a defect, namely, substitution of a variable content of smaller Pr on the Ba site. Such substitution also results in the formation of the minority phase BaCuO_2. Our observation of cuprate-plane antiferromagnetism coupled with evidence that the cuprate planes are insulating (provided by Horii et al. [Phys. Rev. B 6, 6327 (2000)]) indicates that any conductivity is associated with the CuO chains, not with the CuO_2 planes. These results imply that the existence of the pseudogap detected at 150 K in Prl24 by Baeckstroem et al. [Phys. Rev. B. 61, 7049 (2000)] is unrelated to either carriers or spin fluctuations in the cuprate planes.
机译：使用13 GHz的微波光谱技术，我们已经观察到由传导PrBa_2Cu_4O_8的磁有序的铜酸盐平面引起的反铁磁共振。 Cu Neel温度约为80K。此外，我们检测到Cu电子自旋共振是由于链状片段中的Cu或更可能是少数杂质相Cu BaCuO_2引起的，该相也通过X射线检测衍射。尽管该样品的导电温度最低，但仍未检测到颗粒状超导性。 PrBa_2Cu_4O_8的c轴参数取决于工艺，并且其变化比其他Lnl24材料更大；我们提出缺乏超导性是缺陷的结果，即在Ba位点上替换了较小含量Pr的可变含量。这种取代还导致形成少数相BaCuO_2。我们对铜酸盐平面反铁磁性的观察以及铜酸盐平面是绝缘的证据（由Horii等人提供[Phys。Rev. B 6，6327（2000）]）表明，任何电导率都与CuO链有关，而不与CuO_2平面。这些结果表明Baeckstroem等人在Prl24中在150 K处检测到假间隙的存在。 [物理B. 61，7049（2000）。[Rev. B. 61，7049（2000）]与铜酸盐平面中的载流子或自旋波动无关。

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