Electronic Origin of High- TCMaximization and Persistence in Trilayer Cuprate Superconductors Xiangyu Luo13y Hao Chen13y Yinghao Li13y Qiang Gao1 Chaohui Yin13 Hongtao

2025-04-26 0 0 888.87KB 20 页 10玖币

侵权投诉

Electronic Origin of High-TCMaximization and Persistence in

Trilayer Cuprate Superconductors

Xiangyu Luo1,3,†, Hao Chen1,3,†, Yinghao Li1,3,†, Qiang Gao1, Chaohui Yin1,3, Hongtao

Yan1,3, Taimin Miao1,3, Hailan Luo1,3, Yingjie Shu1,3, Yiwen Chen1,3, Chengtian Lin4,

Shenjin Zhang5, Zhimin Wang5, Fengfeng Zhang5, Feng Yang5, Qinjun Peng5,

Guodong Liu1,3,6, Lin Zhao1,3,6, Zuyan Xu5, Tao Xiang2,3,6,7and X. J. Zhou1,3,6,7,∗

1National Lab for Superconductivity,

Beijing National laboratory for Condensed Matter Physics,

Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

2Beijing National laboratory for Condensed Matter Physics,

Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

3University of Chinese Academy of Sciences, Beijing 100049, China

4Max Planck Institute for Solid State Research,

Heisenbergstrasse 1, D-70569 Stuttgart, Germany

5Technical Institute of Physics and Chemistry,

Chinese Academy of Sciences, Beijing 100190, China

6Songshan Lake Materials Laboratory,

Dongguan, Guangdong 523808, China

7Beijing Academy of Quantum Information Sciences, Beijing 100193, China

†These authors contributed equally to this work.

∗Corresponding author: XJZhou@iphy.ac.cn

(Dated: October 13, 2022)

arXiv:2210.06348v1 [cond-mat.supr-con] 12 Oct 2022

In high temperature cuprate superconductors, it was found that the super-

conducting transition temperature Tcdepends on the number of CuO2planes

(n) in the structural unit and the maximum Tcis realized in the trilayer system

(n=3). It was also found that the trilayer superconductors exhibit an unusual

phase diagram that Tckeeps nearly constant in the overdoped region which is

in strong contrast to the Tcdecrease usually found in other cuprate supercon-

ductors. The electronic origin of the Tcmaximization in the trilayer supercon-

ductors and its high Tcpersistence in the overdoped region remains unclear.

By taking high resolution laser-based angle resolved photoemission (ARPES)

measurements, here we report our revelation of the microscopic origin of the

unusual superconducting properties in the trilayer superconductors. For the

ﬁrst time we have observed the trilayer splitting in Bi2Sr2Ca2Cu3O10+δ(Bi2223)

superconductor. The observed Fermi surface, band structures, superconducting

gap and the selective Bogoliubov band hybridizations can be well described by

a three-layer interaction model. Quantitative information of the microscopic

processes involving intra- and interlayer hoppings and pairings are extracted.

The electronic origin of the maximum Tcin Bi2223 and the persistence of the

high Tcin the overdoped region is revealed. These results provide key insights

in understanding high Tcsuperconductivity and pave a way to further enhance

Tcin the cuprate superconductors.

Although signiﬁcant progress has been made in experimental and theoretical studies of

high temperature cuprate superconductors, the mechanism of high temperature supercon-

ductivity remains a prominent issue in condensed matter physics[1, 2]. In addition to pinning

down on the microscopic origin of electron pairing, the challenge also lies in uncovering the

key ingredients that dictate high temperature superconductivity. It has been found that the

doping level is a key controlling parameter in determining the superconducting transition

temperature (Tc); a maximum Tccan usually be observed at the optimal doping (p∼0.16).

It has also been found that, even within the same class of cuprate superconductors, the max-

imum Tcdepends sensitively on the number of CuO2planes (n) in one structural unit: the

maximum Tcincreases with n from single layer (n=1) to triple layer (n=3), reaches a maxi-

mum at n=3 and starts to decrease with further increase of n (Fig. S1a in Supplementary

Materials)[3–7]. For example, in the Bi-based Bi2Sr2Can−1CunO2n+4+δsuperconductors,

the maximum Tcincreases signiﬁcantly from 32 K for n=1 to 91 K for n=2, to 110 K for

n=3[7]. The strong Tcdependence on n, particularly the maximum Tcenhancement for

n=3, indicates that there is another key factor in controlling Tcin addition to the doping

level. Moreover, the three-layer Bi2Sr2Ca2Cu3O10+δ(Bi2223) superconductor exhibits an

unusual phase diagram in that its Tckeeps nearly constant in the optimally and overdoped

region (Fig. S1b in Supplementary Materials). This is in a strong contrast to the usual

phase diagram where Tcdecreases with increasing doping in the overdoped region in other

one-layer or two-layer cuprate superconductors. Revealing the underlying electronic origin of

the Tcmaximization in trilayer superconductors and its high Tcpersistence in the overdoped

region is signiﬁcant in understanding superconductivity mechanism and further enhancing

Tcin cuprate superconductors.

The Bi2223 superconductor has provided an ideal system for angle-resolved photoemission

(ARPES) measurements because of the availability of high quality single crystals and the

easiness of cleavage to get clean and ﬂat surface. So far Bi2223 is also the only trilayer

superconductor on which extensive ARPES studies have been carried out[8–16]. In Bi2223

with three adjacent CuO2planes in one structural unit (Fig. 1a), it is expected from

band structure calculations that three Fermi surface sheets should arise due to interlayer

interactions[17]. However, only one Fermi surface[8–11] or two Fermi surface sheets[12–16]

have been observed in all the previous ARPES measurements on Bi2223. The absence of

three Fermi surface sheets measured in Bi2223 has been attributed to the charge imbalance

between the inner and outer CuO2planes and the weak interlayer coupling[12, 13, 15, 16].

It was also pointed out that trilayer and higher-multilayer splittings would be increasingly

diﬃcult to observe because of the induced pseudogap of the inner layers[4].

In this paper, by taking high resolution laser-based ARPES measurements, we report

for the ﬁrst time the observation of three Fermi surface sheets in Bi2223. The momentum-

dependence of the superconducting gap along all the three Fermi surface sheets is determined

and the Bogoliubov band hybridization between two speciﬁc bands is observed. These ob-

servations make it possible to analyse in detail the intralayer and interlayer couplings and

pairings. The observed Fermi surface topology, the selective band hybridization and the un-

usual Fermi surface- and momentum-dependent superconducting gap can be well understood

by a three-layer interaction model with a global set of parameters. Our results reveal the

microscopic origin of the unusual superconducting properties in the trilayer superconductors.

The ARPES measurements were carried out on an overdoped Bi2223 sample with a Tc

of 108.0 K (Fig. S2 in Supplementary Materials). The high resolution and high statistics

data from our laser ARPES system are essential for the new observations we present in

the paper (see Methods). Fig. 1 shows the Fermi surface mapping and constant energy

contours measured at 18 K. The corresponding band structures along the momentum cuts

from the nodal direction to the antinodal region are presented in Fig. 2. From these results,

three main Fermi surface sheets (labelled as α,βand γin Fig. 1f) and three main bands

(marked as α,βand γin Fig. 2) are clearly observed. In the Fermi surface mapping (Fig.

1b), the spectral weight is mainly conﬁned to the nodal region because of the anisotropic

gap opening that is large near the antinodal region. Upon increasing the binding energy,

the spectral weight spreads to the antinodal region in the constant energy contours (Fig.

1c-1e) and the full contours of the three main Fermi surface show up clearly. By analyzing

the Fermi surface mapping and the constant energy contours in Fig. 1b-1e, combined with

the analysis of the band structures in Fig. 2, we have determined quantitatively the three

main Fermi surface sheets as shown in Fig. 1f. It is the ﬁrst time that three main Fermi

surface sheets are observed in Bi2223. The γFermi surface is well separated from the (α,β)

sheets. The splitting between the αand βsheets increases from the nodal to the antinodal

regions, similar to the bilayer splitting observed in Bi2Sr2CaCu2O8+δ(Bi2212)[18–21]. The

corresponding doping levels of the α,βand γFermi surface sheets, determined from their

areas, are 0.37, 0.22 and 0.08, respectively.

Figure 2 shows the band structure evolution with momentum going from the nodal di-

rection to the antinodal region. Three main bands are clearly observed, labelled as α,βand

γand marked by colored arrows in Fig. 2a. Along the nodal direction (ﬁrst panel in Fig.

2a), the γband is well separated from the (α,β) bands. Although the splitting between the

αand βbands is a minimum along the nodal direction, careful analyses indicate that the α

and βband splitting already exists along the nodal direction with a ∆kF=0.011π/a (see Fig.

S3 in Supplementary Materials). The αand βband splitting increases with the momentum

moving from the nodal to the antinodal regions. The γband sinks quickly to the high

binding energy due to the gap opening, accompanied by strong spectral weight suppression

when the momentum cut shifts from the nodal direction to the antinodal region. Near the

antinodal region, the βband becomes dominant which has much stronger spectral weight

文档加载中……请稍候！
如果长时间未打开，您也可以点击刷新试试。

下载文档到电脑，查找使用更方便

10 玖币 0人已下载

立即下载

摘要：

ElectronicOriginofHigh-TCMaximizationandPersistenceinTrilayerCuprateSuperconductorsXiangyuLuo1;3;y,HaoChen1;3;y,YinghaoLi1;3;y,QiangGao1,ChaohuiYin1;3,HongtaoYan1;3,TaiminMiao1;3,HailanLuo1;3,YingjieShu1;3,YiwenChen1;3,ChengtianLin4,ShenjinZhang5,ZhiminWang5,FengfengZhang5,FengYang5,QinjunPeng5,Guod...

展开>> 收起<<

Electronic Origin of High- TCMaximization and Persistence in Trilayer Cuprate Superconductors Xiangyu Luo13y Hao Chen13y Yinghao Li13y Qiang Gao1 Chaohui Yin13 Hongtao.pdf

共20页,预览4页

还剩页未读，继续阅读

声明：本站为文档C2C交易模式，即用户上传的文档直接被用户下载，本站只是中间服务平台，本站所有文档下载所得的收益归上传人(含作者)所有。玖贝云文库仅提供信息存储空间，仅对用户上传内容的表现方式做保护处理，对上载内容本身不做任何修改或编辑。若文档所含内容侵犯了您的版权或隐私，请立即通知玖贝云文库，我们立即给予删除！

Electronic Origin of High- TCMaximization and Persistence in Trilayer Cuprate Superconductors Xiangyu Luo13y Hao Chen13y Yinghao Li13y Qiang Gao1 Chaohui Yin13 Hongtao

相关推荐

开通VIP享超值会员特权

作者详情

相关内容

热门标签

举报选择: