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铜氧化物超导体中压致超导-绝缘体量子相变

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按照固体能带理论,固体的导电性质通常是由其能带结构所决定的.对于具有能隙的绝缘体或半导体,在压力的作用下其能带的展宽可以使能隙闭合,从而使系统发生绝缘体-金属相变,甚至在低温下呈现出超导电性.这种绝缘体-金属相变被称为"威尔森相变".而"反威尔森相变",即在压力的作用下产生金属(或超导体)-绝缘体转变是经典理论不能预测或解释的问题.本文将主要介绍最近在空穴掺杂铋系铜氧化物高温超导体中发现的压力导致的超导-绝缘体量子相变,并对其形成机制和生成绝缘相的性质进行了简要讨论.新发现的铜氧化物高温超导体中压致超导-绝缘体量子相变不仅提供了一个强关联电子系统在压力下产生奇异量子态的新范例,也说明了超导与其紧邻量子态在压力调制参量作用下所表现出的"同源性",这为深刻理解强关联电子系统中超导态与其他各种量子态之间的关系提供了新的实验依据.此外,分析了这种超导-绝缘体量子相变的普适性,并提出了在此方面开展进一步研究的一些关键问题.作者希望通过本文的介绍能使读者对铜氧化物高温超导体中高压导致的超导-绝缘体相变实验研究方面的新进展和其可能存在的普适意义有所了解,同时希望能对高温超导机理的深入理解及为最终高温超导机理问题的解决提供高压实验研究方面有价值的新信息.
Pressure-induced superconducting-insulating phase transition in copper oxide superconductors
According to the band theory of solid-state physics,the electrical conductivity of solids is determined by their band structure.For insulators or semiconductors with an energy gap,the pressure-induced broadening of the bands can close the energy gap and lead the system to transfer into a normal metallic or superconducting ground state.This type of insulator-metal phase transition is known as the Wilson phase transition.However,a pressure-induced transition from the metallic or superconducting phase to the insulating phase is beyond the predictability of the classic theory.In this study,we primarily introduced the recent discovery of the pressure-induced,superconducting-insulating quantum phase transition(QPT)in hole-doped bismuth-based copper oxide high-temperature superconductors(HTSCs),and discussed and analyzed the universality of the QPT.This finding offers a new paradigm for generating exotic quantum states under pressure in strongly correlated electron systems,demonstrating the intrinsic connections between superconductivity and adjacent quantum states.Moreover,it provides new experimental evidence for a deeper understanding of the relationship between the superconducting state and other quantum states in strongly correlated electron systems.Furthermore,we analyzed the universality of this superconducting-insulating QPT and proposed some important issues for future research,aiming to provide useful information for further elucidating the underlying mechanism of HTSC.

high-pressurecopper-oxide superconductorshole-dopingquantum phase transition

赵金瑜、周亚洲、郭静、蔡树、韩金宇、王鹏玉、吴奇、孙力玲

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中国科学院物理研究所,北京凝聚态物理国家研究中心,北京 100190

中国科学院大学,北京 100190

北京高压科学研究中心,北京 100094

高压 铜氧化物超导体 空穴掺杂 量子相变

国家重点基础研究发展计划国家重点基础研究发展计划国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金中国科学院先导项目(B类)

2017YFA03029002021YFA1401800U2032214121224141200441912104487XDB25000000

2023

10.1360/SSPMA-2023-0260

中国科学(物理学 力学 天文学)
中国科学院

中国科学(物理学 力学 天文学)

CSTPCDCSCD北大核心
影响因子：0.644
ISSN：1674-7275
年,卷(期)：2023.53(12)
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