arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0912.0095cond-mat.supr-concond-mat.str-el
收藏

条序强度对La_{2-x} Sr_xCu_4单晶能斯特效应的影响

Effect of stripe order strength for the Nernst effect in La_{2-x}Sr_xCu_4 single crystals

Takenori Fujii, Tomonori Matsushima, Toshihide Maruoka, Atsushi Asamitsu

摘要:

我们精确地测量了掺Nd的La $_{2-x}$ Sr $_x$ CuO $_4$单晶中的能斯特效应。我们发现,起始温度$T_{onset}$,能斯特信号开始增加,不改变显着,尽管钕掺杂。另一方面,在低温下,能斯特信号的绝对值根据条纹顺序的强度被强烈抑制。这些结果表明,在高温下,(电荷)条纹序的涨落增强了$T_{onset}$以下的能斯特信号,而在低温下,Nd掺杂增强的条纹序抑制了超导涨落,从而降低了能斯特信号.我们还观察到在衍射测量中观察到的电荷有序温度$T_{ch}$以下能斯特信号的增加。

英文摘要:

We have precisely measured the Nernst effect in Nd-doped La$_{2-x}$Sr$_x$CuO$_4$ single crystals with controlling the strength (stability) of the stripe order. We found that the onset temperature $T_{onset}$, where the Nernst signal starts increasing, does not change conspicuously in spite of Nd-doping. At low temperatures, on the other hand, the absolute value of the Nernst signal is strongly suppressed in accordance with the strength of the stripe order. These results imply that the fluctuation of (charge) stripe order enhances the Nernst signal below $T_{onset}$ at high temperatures, and then the stripe order enhanced by Nd-doping suppresses the superconducting fluctuation to reduce the Nernst signal at low temperatures. We also observed an increase of the Nernst signal below the charge order temperature $T_{ch}$ which is observed in diffraction measurement.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑