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arXiv 1601.01564cond-mat.str-elcond-mat.supr-con
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Pd $_x$ HoTe $_{3}$中多重电荷密度波的相互作用及其与超导电性的关系

Interplay between multiple charge-density waves and the relationship with superconductivity in Pd$_x$HoTe$_{3}$

Rui Lou, Yipeng Cai, Zhonghao Liu, Tian Qian, Lingxiao Zhao, Yu Li, Kai Liu, Zhiqing Han, Dandan Zhang, Junbao He, Genfu Chen, Hong Ding, Shancai Wang

摘要:

利用角分辨光电子能谱(ARPES)和电阻率研究了稀土三碲化物($R$ Te $_{3}$)家族的一员HoTe $_{3}$及其Pd嵌入化合物PdPDMATHABMO HoTe $_{3}$,其中由于少量Pd的嵌入抑制了电荷密度波(CDW)跃迁而产生超导性。在HoTe $_{3}$中观察到两个具有垂直嵌套矢量的无公度CDW。随着少量Pd嵌入($x$ = 0.01),大的CDW带隙减小,小的CDW带隙增大。内费米面能隙的动量依赖性从正交性演化到近四方性,表现出两种CDW阶数的竞争。当$x$ = 0.02时,两个CDW能隙都随着SC的出现而减小,当$x$ = 0.04时,进一步增加Pd的含量将完全抑制CDW不稳定性,并产生最大的SC阶数。详细研究了多个CDW的电子结构和电子-声子耦合(EPCs)在Pd嵌入时的演化。我们讨论了多个CDW订单之间的相互作用,以及CDW和SC之间的竞争。

英文摘要:

HoTe$_{3}$, a member of the rare-earth tritelluride ($R$Te$_{3}$) family, and its Pd-intercalated compounds, Pd$_x$HoTe$_{3}$, where superconductivity (SC) sets in as the charge-density wave (CDW) transition is suppressed by the intercalation of a small amount of Pd, are investigated using angle-resolved photoemission spectroscopy (ARPES) and electrical resistivity. Two incommensurate CDWs with perpendicular nesting vectors are observed in HoTe$_{3}$ at low temperatures. With a slight Pd intercalation ($x$ = 0.01), the large CDW gap decreases and the small one increases. The momentum dependence of the gaps along the inner Fermi surface (FS) evolves from orthorhombicity to near tetragonality, manifesting the competition between two CDW orders. At $x$ = 0.02, both CDW gaps decreases with the emergence of SC. Further increasing the content of Pd for $x$ = 0.04 will completely suppress the CDW instabilities and give rise to the maximal SC order. The evolution of the electronic structures and electron-phonon couplings (EPCs) of the multiple CDWs upon Pd intercalation are carefully scrutinized. We discuss the interplay between multiple CDW orders, and the competition between CDW and SC in detail.

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。

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