Publications (46)
Transient gap generation in BaFeAs driven by coherent lattice vibrations
Jacob A. Warshauer, Daniel Alejandro Bustamante Lopez, Qingxin Dong +2
The electronic structure and the magnetic properties of iron-based superconductors are highly sensitive to the pnictogen height. Coherent excitation of the phonon by femto…
Crystal growth and characterization of FeSeTe (0.5 1) from LiCl/KCl flux
Qiaoyu Wang, Kexin Bi, Lewei Chen +9
An eutectic LiCl/KCl flux method in a horizontal configuration has been used to grow a series of homogeneous FeSeTe single crystals of high quality with 0.5 $\…
Dominant role of processing temperature in electric field induced superconductivity in layered ZrNBr
Xinmin Wang, Shuai Zhang, Huanyan Fu +3
Recently, as a novel technique, electronic double-layer transistors (EDLTs) with ionic liquids have shown strong potential for tuning the electronic states of correlated systems. E…
Physical origin of superconductivity in EuFe2As1.4P0.6 and EuFe2As2: pressure-induce valence change of europium
Liling Sun, Jing Guo, Genfu Chen +10
Superconductivity can be realized in Eu-containing pnictides by application of chemical (internal) and physical (external) pressure, the intrinsic physical mechanism of which attra…
Structural and magnetic phase transitions near optimal superconductivity in BaFe(AsP)
Ding Hu, Xingye Lu, Wenliang Zhang +17
We use nuclear magnetic resonance (NMR), high-resolution x-ray and neutron scattering to study structural and magnetic phase transitions in phosphorus-doped BaFe(AsP$_x…
An Anomalous Circular Photogalvanic Effect in the Weyl Semimetal TaAs
Kai Sun, Shuaishuai Sun, Cong Guo +5
Weyl semimetal (WSM) is expected to be an ideal spintronic material owing to its spin currents carried by the bulk and surface states with spin-momentum locking. A photocurrent gen…
Electronic Evidence of Temperature-Induced Lifshitz Transition and Topological Nature in ZrTe5
Yan Zhang, Chenlu Wang, Li Yu +25
The topological materials have attracted much attention recently. While three-dimensional topological insulators are becoming abundant, two-dimensional topological insulators remai…
Electric field induced permanent superconductivity in layered metal nitride chloride MNCl(M: Hf and Zr)
Shuai Zhang, Moran Gao, Huanyan Fu +3
The device of electric double-layer transistor (EDLT) with ionic liquid has been employed as an effective way to dope carriers over a wide range, which can induce metallic state, m…
Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals
Chris P. Weber, Bryan S. Berggren, Madison G. Masten +13
Recent years have seen the rapid discovery of solids whose low-energy electrons have a massless, linear dispersion, such as Weyl, line-node, and Dirac semimetals. The remarkable op…
Electronic Structure Examination on the Topological Properties of CaMnSb by Angle-Resolved Photoemission Spectroscopy
Hongtao Rong, Liqin Zhou, Junbao He +15
We have carried out detailed high resolution ARPES measurements and band structure calculations to study the electronic structure of CaMnSb. The observed Fermi surface mainly…
Unified phase diagram for iron-based superconductors
Yanhong Gu, Zhaoyu Liu, Tao Xie +14
High-temperature superconductivity is closely adjacent to a long-range antiferromagnet, which is called a parent compound. In cuprates, all parent compounds are alike and carrier d…
Large transverse thermoelectric figure of merit in a Dirac semimetal
Junsen Xiang, Sile Hu, Meng Lyu +6
Thermoelectric (TE) conversion in conducting materials is of eminent importance for providing renewable energy and solid-state cooling. Although traditionally, the Seebeck effect p…
Anomalous Structural Response of Quasi-One-Dimensional Antiferromagnetic Metal KMn6Bi5 under high pressure
Hanming Ma, Qingxin Dong, Tong Shi +11
We report high-pressure single-crystal X-ray diffraction measurements on the quasi-one-dimensional (Q1D) antiferromagnetic metal KMn6Bi5 up to 12.5 GPa, revealing the detailed pres…
Ultrafast hot carrier dynamics of ZrTe from time-resolved optical reflectivity
Xiu Zhang, Hai-Ying Song, X. C. Nie +8
We investigate the hot carrier dynamics of ZrTe by ultrafast time-resolved optical reflectivity. Our results reveal a phonon-mediated across-gap recombination, consistent with…
Spin excitations in optimally P-doped BaFe2(As0.7P0.3)2superconductor
Ding Hu, Zhiping Yin, Wenliang Zhang +12
We use inelastic neutron scattering to study temperature and energy dependence of spin excitations in optimally P-doped BaFe2(As0.7P0.3)2 superconductor (Tc = 30 K) throughout the…
The role of 245 phase in alkaline iron selenide superconductors revealed by high pressure studies
Peiwen Gao, Rong Yu, Liling Sun +15
Here we show that a pressure of about 8 GPa suppresses both the vacancy order and the insulating phase, and a further increase of the pressure to about 18 GPa induces a second tran…
Unusual Electronic Structure of Dirac Material BaMnSb Revealed by Angle-Resolved Photoemission Spectroscopy
Hongtao Rong, Liqin Zhou, Junbao He +11
High resolution angle resolved photoemission measurements and band structure calculations are carried out to study the electronic structure of BaMnSb. All the observed bands ar…
Spin excitation anisotropy in optimal-isovalent-doped superconductor BaFe2(As0.7P0.3)2
Ding Hu, Wenliang Zhang, Yuan Wei +8
We use neutron polarization analysis to study spin excitation anisotropy in the optimal-isovalent-doped superconductor BaFe2(As0.7P0.3)2 (Tc = 30 K). Different from optimally hole…
Discovery of a metallic room-temperature d-wave altermagnet KV2Se2O
Bei Jiang, Mingzhe Hu, Jianli Bai +19
Beyond conventional ferromagnetism and antiferromagnetism, altermagnetism is a recently discovered unconventional magnetic phase characterized by time-reversal symmetry breaking an…
Giant magnetic quantum oscillations in the thermal conductivity of TaAs: Indications of chiral zero sound
Junsen Xiang, Sile Hu, Zhida Song +12
Charge transport of topological semimetals has been in the focus of intensive investigations because of their non-trivial band topology. Heat transport of these materials, on the o…
Real-space identification of distinct magnetic configurations in a candidate d-wave altermagnet
Jin-Cheng Gu, Mingzhe Hu, Ziyin Song +11
Altermagnetism is an emerging class of magnetic order characterized by momentum-dependent spin-split electronic structures despite vanishing net magnetization. Although momentum-sp…
Strong superconducting pairing strength and pseudogap features in a putative multiphase heavy-fermion superconductor CeRh2As2 by soft point-contact spectroscopy
Qingxin Dong, Tong Shi, Pengtao Yang +18
CeRh2As2 is a newly discovered candidate of multiphase heavy-fermion superconductor (Tc=0.3 K) with intriguing physical properties. Here, we employ soft point-contact spectroscopy…
Reemerging superconductivity at 48 K across quantum criticality in iron chalcogenides
Liling Sun, Xiao-Jia Chen, Jing Guo +14
Pressure plays an essential role in the induction1 and control2,3 of superconductivity in iron-based superconductors. Substitution of a smaller rare-earth ion for the bigger one to…
Unexpected weak spatial variation of local density of sates induced by individual Co impurity atoms in Na(Fe{1-x}Cox)As as revealed by scanning tunneling spectroscopy
Huan Yang, Zhenyu Wang, Delong Fang +7
We use spatially resolved scanning tunneling spectroscopy in Na(Fe{1-x}Cox)As to investigate the impurity effect induced by Co dopants. The Co impurities are successfully identifie…
Pressure induced electronic band evolution and observation of superconductivity in the Dirac semimetal ZrTe5
Sanskar Mishra, Nagendra Singh, Vinod K. Gangwar +8
We report a comprehensive investigation of the pressure effects on the magnetotransport properties of the topological material ZrTe5 within 1 to 8 GPa pressure range. With increasi…
Structural and resistivity properties of FeCoSe single crystals grown by the molten salt method
Qiaoyu Wang, Mingwei Ma, Binbin Ruan +8
A series of tetragonal FeCoSe single crystals with a complete Co doping range (0x0.52) up to its solid solubility limit in FeSe have been grown by an eute…
Growth of millimeter-sized high-quality CuFeSe single crystals by the molten salt method and study of their semiconducting behavior
Mingwei Ma, Binbin Ruan, Menghu Zhou +9
An eutectic AlCl/KCl molten salt method in a horizontal configuration was employed to grow millimeter-sized and composition homogeneous CuFeSe single crystals due to the co…
Low-energy spin excitations in optimally doped CaFeCoAsF superconductor studied with inelastic neutron scattering
Mingwei Ma, Philippe Bourges, Yvan Sidis +4
There are few inelastic neutron scattering (INS) reports on the superconducting single crystals of FeAs-1111 system, even though it was first discovered in 2008, due to the extreme…
Comparative study on the thermoelectric effect of parent oxypnictides LaAsO ( = Fe, Ni)
Qian Tao, Zengwei Zhu, Xiao Lin +5
The thermopower and Nernst effect were investigated for undoped parent compounds LaFeAsO and LaNiAsO. Both thermopower and Nernst signal in iron-based LaFeAsO are significantly lar…
Infrared spectroscopic studies of the topological properties in CaMnSb2
Ziyang Qiu, Congcong Le, Yaomin Dai +6
We present temperature-dependent infrared spectroscopic studies of CaMnSb2, a proposed threedimensional topological material. The low plasma edge in the reflectivity spectrum and s…
Observation of the chiral anomaly induced negative magneto-resistance in 3D Weyl semi-metal TaAs
Xiaochun Huang, Lingxiao Zhao, Yujia Long +9
Weyl semi-metal is the three dimensional analog of graphene. According to the quantum field theory, the appearance of Weyl points near the Fermi level will cause novel transport ph…
Effect of pressure on the transport properties and thermoelectric performance of Dirac semimetal ZrTe5
Sanskar Mishra, Nagendra Singh, V. K. Gangwar +11
In this study, we have investigated and compared the effect of hydrostatic pressure up to ~20 kbar on the transport properties of ZrTe5 single crystals grown by chemical vapor tran…
Simultaneous achievement of record-breaking colossal magnetoresistance and angular magnetoresistance in an antiferromagnetic semiconductor EuSe2
Qingxin Dong, Pengtao Yang, Zhihao Liu +10
Magnetoresistance effect lays the foundation for spintronics, magnetic sensors and hard drives. The pursuit of magnetic materials with colossal magnetoresistance (CMR) and/or angul…
Electronic structure and open-orbit Fermi surface topology in isostructural semimetals NbAs and WAs with extremely large magnetoresistance
Rui Lou, Yiyan Wang, Lingxiao Zhao +11
In transition-metal dipnictides ( = Ta, Nb; = P, As, Sb), the origin of extremely large magnetoresistance (XMR) is yet to be studied by the direct visualization o…
Pressure-induced lattice collapse in tetragonal phase and structural phase transition in single crystalline Fe1.05Te
Chao Zhang, Wei Yi, Liling Sun +7
We report studies of in-situ x-ray diffraction (XRD) and electronic properties on the single crystalline of Fe1.05Te compound under high pressure. The results demonstrated that the…
Field-free platform for topological zero-energy mode in superconductors LiFeAs and PbTaSe
Songtian S. Zhang, Jia-Xin Yin, Guangyang Dai +22
Superconducting materials exhibiting topological properties are emerging as an exciting platform to realize fundamentally new excitations from topological quantum states of matter.…
Superconducting fluctuations in isovalently-substituted BaFe(AsP): Possible observation of multiband effects
A. Ramos-Ãlvarez, J. Mosqueira, F. Vidal +4
The nature of superconducting fluctuation effects in the isovalently-substituted iron pnictide BaFe(AsP) (x=0.35) is probed through measurements of the magnetiz…
Quantum-critical phase out of frustrated magnetism in a strongly correlated metal
Hengcan Zhao, Jiahao Zhang, Meng Lyu +11
Strange-metal phenomena often develop at the border of antiferromagnetic order in strongly correlated metals. It has been well established that they can originate from the fluctuat…
Interplay between multiple charge-density waves and the relationship with superconductivity in PdHoTe
Rui Lou, Yipeng Cai, Zhonghao Liu +10
HoTe, a member of the rare-earth tritelluride (Te) family, and its Pd-intercalated compounds, PdHoTe, where superconductivity (SC) sets in as the charge-de…
Pronounced orbital-selective electron-electron correlation and electron-phonon coupling in V2Se2O
Mingzhe Hu, Ziyin Song, Jingwen Cheng +16
Orbital-selective many-body effects, in which electrons occupying different orbitals experience distinct interaction strengths, play a crucial role in correlated multiorbital mater…
Compression-induced magnetic obstructed atomic insulator and spin singlet state in antiferromagnetic KV2Se2O
Liucheng Chen, Jiayi Yue, Jingwen Cheng +8
Among the complex many-body systems, the metal-insulator transition stands out as a cornerstone and a particularly fertile ground for scientific inquiry. The established models inc…
Correlation between intercalated magnetic layers and superconductivity in pressurized EuFe2(As0.81P0.19)2
Jing Guo, Qi Wu, Ji Feng +13
We report comprehensive high pressure studies on correlation between intercalated magnetic layers and superconductivity in EuFe2(As0.81P0.19)2 single crystal through in-situ high p…
Nodeless superconductivity in KFeSe single crystals revealed by low temperature specific heat
Bin Zeng, Bing Shen, Genfu Chen +4
Low temperature specific heat (SH) has been measured in KFeSe single crystals with T = 32 K. The SH anomaly associated with the superconducting transition is mo…
Experimental observation of an anomalous peak in isofield M(T) curves in BaFe(AsP) resembling the fish-tail in () curves further suggesting a possible phase transition in the irreversible regime
S. Salem-Sugui, J. Mosqueira, A. D. Alvarenga +5
We measure magnetization as a function of temperature, magnetic field and time in a BaFe(AsP) single crystal with = 27.6 K. The fish-tail observed o…
Nonsaturating magnetoresistance, anomalous Hall effect, and magnetic quantum oscillations in ferromagnetic semimetal PrAlSi
Meng Lyu, Junsen Xiang, Zhenyu Mi +7
We report a comprehensive investigation of the structural, magnetic, transport and thermodynamic properties of a single crystal PrAlSi, in comparison to its nonmagnetic analogue La…
Superconductivity in a layered cobalt oxychalcogenide NaCoSeO with a triangular lattice
Jingwen Cheng, Jianli Bai, Binbin Ruan +11
Unconventional superconductivity in bulk materials under ambient pressure is extremely rare among the 3d transition metal compounds outside the layered cuprates and iron-based fami…