Xiyu Zhu
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View article: Density wave-like behavior in a kagome material, Ce2Ru3Si
Density wave-like behavior in a kagome material, Ce2Ru3Si Open
View article: Density-wave like behavior in a new Kagome material Ce$_{2}$Ru$_{3}$Si
Density-wave like behavior in a new Kagome material Ce$_{2}$Ru$_{3}$Si Open
Kagome materials with inherent geometric frustration can produce many interesting physical properties, such as flat bands, quantum spin liquid, chiral magnetism, superconductivity and density-wave orders. Sometimes, the localized 4$f$ elec…
View article: Anomalous properties in normal and superconducting states of Sc2Ir4-xSix due to flat band effect driven by spin-orbit coupling
Anomalous properties in normal and superconducting states of Sc2Ir4-xSix due to flat band effect driven by spin-orbit coupling Open
Correlation effect may be induced by the flat band(s) near the Fermi energy, as demonstrated in twisted graphene, Kagome materials, and heavy Fermion materials. Unconventional superconductivity may arise from this correlation effect and sh…
View article: Ferromagnetism and insulating behavior with a logarithmic temperature dependence of resistivity in Pb10−xCux(PO4)6O
Ferromagnetism and insulating behavior with a logarithmic temperature dependence of resistivity in Pb10−xCux(PO4)6O Open
View article: Signature of superconductivity in pressurized La$_4$Ni$_3$O$_{10}$
Signature of superconductivity in pressurized La$_4$Ni$_3$O$_{10}$ Open
The discovery of high-temperature superconductivity near 80 K in bilayer nickelate La$_3$Ni$_2$O$_7$ under high pressures has renewed the exploration of superconducting nickelate in bulk materials. The extension of superconductivity in oth…
View article: Absence of near-ambient superconductivity in LuH2±xNy
Absence of near-ambient superconductivity in LuH2±xNy Open
A recent study demonstrated near-ambient superconductivity in nitrogen-doped lutetium hydride 1 . This stimulated a worldwide interest in exploring room-temperature superconductivity at low pressures. Here, by using a high-pressure and hig…
View article: Characterization of the (Cu,C)Ba<sub>2</sub>Ca<sub>3</sub>Cu<sub>4</sub>O 11+δ single crystals grown under high pressure
Characterization of the (Cu,C)Ba<sub>2</sub>Ca<sub>3</sub>Cu<sub>4</sub>O 11+δ single crystals grown under high pressure Open
By using a high pressure and high temperature (3.7 GPa, 1120 ∘ C) synthesis technique, we have grown (Cu,C)Ba 2 Ca 3 Cu 4 O single crystals. X-ray diffraction, scanning electron microscopy, resistivity, and magnetization measurements…
View article: Superconductivity at 44.4 K achieved by intercalating EMIM+ into FeSe
Superconductivity at 44.4 K achieved by intercalating EMIM+ into FeSe Open
Superconductivity with transition temperature Tc above 40 K was observed in protonated FeSe (Hy-FeSe) previously with the ionic liquid of EMIM-BF4 used in the electrochemical process. However, the real superconducting phase is not clear un…
View article: Charge-stripe fluctuations in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>Nd</mml:mi></mml:mrow><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>Ni</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mn>8</mml:mn></mml:msub></mml:math> as evidenced by optical spectroscopy
Charge-stripe fluctuations in as evidenced by optical spectroscopy Open
We present an investigation into the optical properties of Nd$_{4}$Ni$_{3}$O$_{8}$ at different temperatures from 300 down to 5~K over a broad frequency range. The optical conductivity at 5~K is decomposed into IR-active phonons, a far-inf…
View article: Prompt surgery is effective for acute type A aortic dissection with cerebral ischemia
Prompt surgery is effective for acute type A aortic dissection with cerebral ischemia Open
Prompt surgery is effective for aTAAD with CI, and preoperative coma and a safe duration longer than 12.75 hours would predict worse outcomes.
View article: Single particle tunneling spectrum of superconducting Nd1-xSrxNiO2 thin films
Single particle tunneling spectrum of superconducting Nd1-xSrxNiO2 thin films Open
View article: NMR Evidence of Antiferromagnetism in Nd$_{0.85}$Sr$_{0.15}$NiO$_2$
NMR Evidence of Antiferromagnetism in Nd$_{0.85}$Sr$_{0.15}$NiO$_2$ Open
Despite the recent discovery of superconductivity in Nd$_{1-x}$Sr$_{x}$NiO$_2$ thin films, the absence of superconductivity and antiferromagnetism in their bulk materials remain a puzzle. Here we report the $^{1}$H NMR {measurements on pow…
View article: Superconductivity in Sm-doped 1,3,5-triphenylbenzene
Superconductivity in Sm-doped 1,3,5-triphenylbenzene Open
We report the discovery of superconductivity at about 4.3 K in the samarium doped 1,3,5-triphenylbenzene. By using a solid state reaction method, the samarium doped 1,3,5-triphenylbenzene samples are successfully synthesized. These samples…
View article: Van Hove singularity arising from Mexican-hat-shaped inverted bands in the topological insulator Sn-doped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mrow><mml:mn>1.1</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Sb</mml:mi><mml:mrow><mml:mn>0.9</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Te</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">S</mml:mi></mml:mrow></mml:math>
Van Hove singularity arising from Mexican-hat-shaped inverted bands in the topological insulator Sn-doped Open
The optical properties of Sn-doped Bi$_{1.1}$Sb$_{0.9}$Te$_{2}$S, the most\nbulk-insulating topological insulator thus far, have been examined at different\ntemperatures over a broad frequency range. No Drude response is detected in the\nl…
View article: Absence of superconductivity in bulk Nd1-xSrxNiO2 (x = 0.2, 0.4)
Absence of superconductivity in bulk Nd1-xSrxNiO2 (x = 0.2, 0.4) Open
Recently superconductivity at 9 - 15 K was discovered in an infinite-layer nickelate (Nd$_{0.8}$Sr$_{0.2}$NiO$_2$ films), which has received enormous attention. Since the $Ni^{1+}$ ionic state in NdNiO$_2$ may have the $3d^9$ outer-shell e…
View article: Observation and characterization of the zero energy conductance peak in the vortex core state of FeTe$_{0.55}$Se$_{0.45}$
Observation and characterization of the zero energy conductance peak in the vortex core state of FeTe$_{0.55}$Se$_{0.45}$ Open
The search for the Majorana fermions in condensed matter physics has attracted much attention, partially because they may be used for the fault-tolerant quantum computation. It has been predicted that the Majorana zero mode may exist in th…
View article: Accurate determination of the Fermi surface of tetragonal FeS via quantum oscillation measurements and quasiparticle self-consistent <i>GW</i> calculations
Accurate determination of the Fermi surface of tetragonal FeS via quantum oscillation measurements and quasiparticle self-consistent <i>GW</i> calculations Open
We perform de Haas-van Alphen measurements and quasiparticle self-consistent \textit{GW} (QS\textit{GW}) calculations on FeS. The calculated Fermi surface (FS) consists of two hole and two electron cylinders. We observe all the eight predi…
View article: Synergy and competition between superconductivity and antiferromagnetism in FeSe under pressure
Synergy and competition between superconductivity and antiferromagnetism in FeSe under pressure Open
Temperature dependence of resistivity under high pressures with magnetic\nfields parallel and perpendicular to the FeSe planes are measured in FeSe\nsingle crystals. It is found that the structural transition (nematic)\ntemperature is supp…
View article: Direct visualization of sign-reversal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>s</mml:mi><mml:mo>±</mml:mo></mml:msup></mml:math>superconducting gaps in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>FeTe</mml:mi><mml:mrow><mml:mn>0.55</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mrow><mml:mn>0.45</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Direct visualization of sign-reversalsuperconducting gaps in Open
In many unconventional superconductors, the pairing of electrons is driven by\nthe repulsive interaction, which leads to the sign reversal of superconducting\ngaps along the Fermi surfaces (FS) or between them. However, to measure this\nsi…
View article: Sign-reversal superconducting gaps revealed by phase-referenced quasiparticle interference of impurity-induced bound states in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mi>Li</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:msub><mml:mi>OHFe</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Zn</mml:mi><mml:mi>y</mml:mi></mml:msub><mml:mi>Se</mml:mi></mml:mrow></mml:math>
Sign-reversal superconducting gaps revealed by phase-referenced quasiparticle interference of impurity-induced bound states in Open
By measuring the spatial distribution of differential conductance near impurities on Fe sites, we have obtained the quasi-particle interference (QPI) patterns in the (Li$_{1-x}$Fe$_x$)OHFe$_{1-y}$Zn$_y$Se superconductor with only electron …
View article: Structure and physical properties of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CsV</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mi mathvariant="normal">O</mml:mi></mml:mrow></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">V</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">O</mml:mi></mml:mrow></mml:math>
Structure and physical properties of and Open
By using solid-state reactions, we successfully synthesize new oxyselenides CsV$_2$Se$_{2-x}$O (x = 0, 0.5). These compounds containing V$_2$O planar layers with a square lattice crystallize in the CeCr$_2$Si$_2$C structure with the space …
View article: Vortex lattice and vortex bound states in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CsFe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> investigated by scanning tunneling microscopy/spectroscopy
Vortex lattice and vortex bound states in investigated by scanning tunneling microscopy/spectroscopy Open
We investigate the vortex lattice and vortex bound states in CsFe$_2$As$_2$\nsingle crystals by scanning tunneling microscopy/spectroscopy (STM/STS) under\nvarious magnetic fields. A possible structural transition or crossover of\nvortex l…
View article: Pressure induced superconductivity in the compound ScZrCo
Pressure induced superconductivity in the compound ScZrCo Open
It is widely perceived that the correlation effect may play an important role\nin several unconventional superconducting families, such as cuprate, iron-based\nand heavy-fermion superconductors. The application of high pressure can tune\nt…
View article: Magnetization of potassium-doped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>p</mml:mi></mml:math>-terphenyl and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>p</mml:mi></mml:math>-quaterphenyl by high-pressure synthesis
Magnetization of potassium-doped -terphenyl and -quaterphenyl by high-pressure synthesis Open
By using high pressure synthesis method, we have fabricated the potassium\ndoped para-terphenyl. The temperature dependence of magnetization measured in\nboth zero-field-cooled and field-cooled processes shows step like transitions\nat abo…
View article: Concurrence of superconductivity and structure transition in Weyl semimetal TaP under pressure
Concurrence of superconductivity and structure transition in Weyl semimetal TaP under pressure Open
Weyl semimetal defines a material with three-dimensional Dirac cones, which appear in pair due to the breaking of spatial inversion or time reversal symmetry. Superconductivity is the state of quantum condensation of paired electrons. Turn…
View article: Sign reversal of the order parameter in (Li1−xFex)OHFe1−yZnySe
Sign reversal of the order parameter in (Li1−xFex)OHFe1−yZnySe Open
View article: Highly anisotropic superconducting gaps and possible evidence of antiferromagnetic order in FeSe single crystals
Highly anisotropic superconducting gaps and possible evidence of antiferromagnetic order in FeSe single crystals Open
Specific heat has been measured in FeSe single crystals down to 0.414 K under\nmagnetic fields up to 16 T. A sharp specific heat anomaly at about 8.2 K is\nobserved and is related to the superconducting transition. Another jump of\nspecifi…
View article: BCS-like critical fluctuations with limited overlap of Cooper pairs in FeSe
BCS-like critical fluctuations with limited overlap of Cooper pairs in FeSe Open
In conventional superconductors, very narrow superconducting fluctuation\nregions are observed above $T_c$ because of the strong overlapping of Cooper\npairs in a coherence volume. In the bulk form of iron chalcogenide\nsuperconductor FeSe…
View article: Pressure-induced superconductivity in Bi single crystals
Pressure-induced superconductivity in Bi single crystals Open
Measurements on resistivity and magnetic susceptibility have been carried out\nfor Bi single crystals under pressures up to 10.5GPa. The temperature dependent\nresistivity shows a semimetallic behavior at ambient and low pressures (below\n…
View article: Superconductivity in LiOHFeS single crystals with a shrunk c-axis lattice constant
Superconductivity in LiOHFeS single crystals with a shrunk c-axis lattice constant Open