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arXiv 1703.04620cond-mat.str-el
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高$T_c$铜氧化物中电荷密度波序导致的霍尔数抑制

Suppression of Hall number due to charge density wave order in high-$T_c$ cuprates

Gargee Sharma, S. Nandy, A. Taraphder, Sumanta Tewari

AI总结:

针对高温铜氧化物赝能隙相,提出在最佳掺杂附近高磁场下存在单向不公度CDW、中等掺杂下双向与单向序共存的假设,解释了低温霍尔效应的异常行为。

摘要:

理解空穴掺杂高温铜氧化物超导体中的赝能隙相,仍然是凝聚态物理学中的一个核心挑战。从近期的大量实验中,目前有令人信服的证据表明,在该相内很宽的掺杂范围内存在打破平移对称性的电荷密度波(CDW)序。迄今为止,在$p\simeq 0.08$和$p\simeq 0.16$之间大致相同的掺杂范围内,报道了两种不同类型的不公度电荷序——在零磁场或低磁场下的双向电荷序,以及在高磁场且接近上临界场$H_{c2}$时的单向电荷序。与此同时,近期的高场霍尔实验也揭示了赝能隙相中费米面重建的两个间接但显著的标志,即在中等空穴掺杂范围内低温下霍尔系数变为负值,以及在最佳掺杂$p\sim 0.19$附近正霍尔数快速抑制且不改变符号。我们表明,假设在最佳掺杂附近的高磁场下存在单向不公度CDW(有或无共存的弱双向序),并且在中等掺杂范围的高磁场下两种类型的序以大致相等的幅度共存,可能有助于解释整个赝能隙相中低温霍尔效应的显著行为。

英文摘要:

Understanding the pseudogap phase in hole-doped high temperature cuprate superconductors remains a central challenge in condensed matter physics. From a host of recent experiments there is now compelling evidence of translational symmetry breaking charge density wave (CDW) order in a wide range of doping inside this phase. Two distinct types of incommensurate charge order -- bidirectional at zero or low magnetic fields and unidirectional at high magnetic fields close to the upper critical field $H_{c2}$ -- have been reported so far in approximately the same doping range between $p\simeq 0.08$ and $p\simeq 0.16$. In concurrent developments, recent high field Hall experiments have also revealed two indirect but striking signatures of Fermi surface reconstruction in the pseudogap phase, namely, a sign change of the Hall coefficient to negative values at low temperatures at intermediate range of hole doping and a rapid suppression of the positive Hall number without change in sign near optimal doping $p \sim 0.19$. We show that the assumption of a unidirectional incommensurate CDW (with or without a coexisting weak bidirectional order) at high magnetic fields near optimal doping and a coexistence of both types of orders of approximately equal magnitude at high magnetic fields at intermediate range of doping may help explain the striking behavior of low temperature Hall effect in the entire pseudogap phase.

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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