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Topological Semimetal Transport Modulated by Interstitial Fe in Ba(FeCo)_2$ Superconductors
Ze-Xian Deng, Qiang-Jun Cheng, Jing Jiang +14
Topological semimetals are renowned for exhibiting large, unsaturated magnetoresistance arising from ultrahigh carrier mobility and electron-hole compensation. However, such behavi…
Intertwined Charge Stripes and Majorana Zero Modes in An Iron-Based Superconductor
Yu Liu, Li-Xuan Wei, Qiang-Jun Cheng +12
In type-II superconductors, magnetic fields modulate the amplitude and phase of the superconducting order parameter, forming quantized vortices where superconductivity is locally s…
Merohedral disorder and impurity impacts on superconductivity of fullerenes
Shu-Ze Wang, Ming-Qiang Ren, Sha Han +3
Local quasiparticle states around impurities provide essential insight into the mechanism of unconventional superconductivity, especially when the candidate materials are proximate…
Molecular beam epitaxy growth and surface structure of Sr1-xNdxCuO2 cuprate films
Jia-Qi Fan, Shu-Ze Wang, Xue-Qing Yu +5
We report on the epitaxial growth and surface structure of infinite-layer cuprate Sr1-xNdxCuO2 films on SrTiO3(001) substrates by combining ozone-assisted molecular beam epitaxy an…
Stoichiometry and defect superstructures in epitaxial FeSe films on SrTiO3
Xue-Qing Yu, Ming-Qiang Ren, Yi-Min Zhang +5
Cryogenic scanning tunneling microscopy is employed to investigate the stoichiometry and defects of epitaxial FeSe thin films on SrTiO3(001) substrates under various post-growth an…
Presence of -wave pairing in Josephson junctions made of twisted ultrathin BiSrCaCuO flakes
Yuying Zhu, Menghan Liao, Qinghua Zhang +14
Since the discovery of high temperature superconductivity in cuprates, Josephson junction based phase-sensitive experiments are believed and used to provide the most convincing evi…
Coulomb gap induced by electronic correlation and enlarged superconducting gap in laterally confined Pb islands grown on SrTiO3
Yonghao Yuan, Xintong Wang, Canli Song +6
We report high-resolution scanning tunneling microscopy (STM) study of nano-sized Pb islands grown on SrTiO3, where three distinct types of gaps with different energy scales are re…
Edge states at nematic domain walls in FeSe films
Yonghao Yuan, Wei Li*, Bin Liu +9
Quantum spin Hall (QSH) effect is an intriguing phenomenon arising from the helical edge states in two-dimensional topological insulators. We use molecular beam epitaxy (MBE) to pr…
Origin of charge transfer and enhanced electron-phonon coupling in single unit-cell FeSe films on SrTiO3
Huimin Zhang, Ding Zhang, Xiaowei Lu +7
Interface charge transfer and electron-phonon coupling have been suggested to play a crucial role in the recently discovered high-temperature superconductivity of single unit-cell…
Interface high-temperature superconductivity
Lili Wang, Xucun Ma, Qi-Kun Xue
Cuprate high temperature superconductors consist of two quasi-two-dimensional (2D) substructures: CuO2 superconducting layers and charge reservoir layers. The superconductivity is…
The Role of SrTiO3 Phonon Penetrating into thin FeSe Films in the Enhancement of Superconductivity
Shuyuan Zhang, Jiaqi Guan, Xun Jia +10
The significant role of interfacial coupling on the superconductivity enhancement in FeSe films on SrTiO3 has been widely recognized. But the explicit origination of this coupling…
Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3(110)
Guanyu Zhou, Ding Zhang, Chong Liu +9
We report high temperature superconductivity in one unit-cell (1-UC) FeSe films grown on STO(110) substrate by molecular beam epitaxy. By in-situ scanning tunneling spectroscopy me…
Superconductivity dichotomy in K-coated single and double unit cell FeSe films on SrTiO3
Chenjia Tang, Ding Zhang, Yunyi Zang +12
We report the superconductivity evolution of one unit cell (1-UC) and 2-UC FeSe films on SrTiO3(001) substrates with potassium (K) adsorption. By in situ scanning tunneling spectro…
Thickness dependence of superconductivity and superconductor-insulator transition in ultrathin FeSe films on SrTiO3(001) substrate
Qingyan Wang, Wenhao Zhang, Zuocheng Zhang +7
Interface-enhanced high-temperature superconductivity in one unit-cell (UC) FeSe film on SrTiO3(001) (STO) substrate has recently attracted much attention in condensed matter physi…
Ultrafast Dynamics Evidence of High Temperature Superconductivity in Single Unit Cell FeSe on SrTiO3
Y. C. Tian, W. H. Zhang, F. S. Li +7
The recent observation of high-temperature superconductivity in one unit cell thick FeSe on SrTiO3 (1UC FeSe/STO)1 initiated a new pathway to realizing even higher transition tempe…
Visualizing the elongated vortices in -Ga nanostrips
Hui-Min Zhang, Zi-Xiang Li, Jun-Ping Peng +10
We study the magnetic response of superconducting -Ga via low temperature scanning tunneling microscopy and spectroscopy. The magnetic vortex cores rely substantially on the Ga…
High temperature superconducting FeSe films on SrTiO3 substrates
Yi Sun, Wenhao Zhang, Ying Xing +7
Interface enhanced superconductivity at two dimensional limit has become one of most intriguing research directions in condensed matter physics. Here, we report the superconducting…
Dichotomy of Electronic Structure and Superconductivity between Single-Layer and Double-Layer FeSe/SrTiO3 Films
Xu Liu, Defa Liu, Wenhao Zhang +21
The latest discovery of possible high temperature superconductivity in the single-layer FeSe film grown on a SrTiO3 substrate, together with the observation of its unique electroni…
Electronic Evidence of an Insulator-Superconductor Transition in Single-Layer FeSe/SrTiO3 Films
Junfeng He, Xu Liu, Wenhao Zhang +21
In high temperature cuprate superconductors, it is now generally agreed that the parent compound is a Mott insulator and superconductivity is realized by doping the antiferromagnet…
Fully gapped topological surface states in BiSe films induced by a d-wave high-temperature superconductor
Eryin Wang, Hao Ding, Alexei V. Fedorov +17
Topological insulators are a new class of materials, that exhibit robust gapless surface states protected by time-reversal symmetry. The interplay between such symmetry-protected t…
Superconductivity in a single layer alkali-doped FeSe: a weakly coupled two-leg ladder system
Wei Li, Hao Ding, Pengfei Zhang +10
We prepare single layer potassium-doped iron selenide (110) film by molecular beam expitaxy. Such a single layer film can be viewed as a two-dimensional system composed of weakly c…
Phase Diagram and High Temperature Superconductivity at 65 K in Tuning Carrier Concentration of Single-Layer FeSe Films
Shaolong He, Junfeng He, Wenhao Zhang +21
Superconductivity in the cuprate superconductors and the Fe-based superconductors is realized by doping the parent compound with charge carriers, or by application of high pressure…
KFe_2Se_2 is the parent compound of K-doped iron selenide superconductors
Wei Li, Hao Ding, Zhi Li +9
We elucidate the existing controversies in the newly discovered K-doped iron selenide (KxFe2-ySe2-z) superconductors. The stoichiometric KFe2Se2 with \surd2\times\surd2 charge orde…
Electronic Origin of High Temperature Superconductivity in Single-Layer FeSe Superconductor
Defa Liu, Wenhao Zhang, Daixiang Mou +21
The latest discovery of high temperature superconductivity signature in single-layer FeSe is significant because it is possible to break the superconducting critical temperature ce…