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| 1 | Metamagnetic transitions and anomalous magnetoresistance in EuAg4As2 crystals显示文摘In this work,we systematically studied the magnetic and transport properties of EuAg4As2 single crystals.It was found that the two antiferromagnetic transitions(TN1=10 K and TN2=15 K)were driven to lower temperatures by an applied magnetic field.Below TN1,two successive metamagnetic transitions were observed when a magnetic field was applied in the ab plane(H//abplane).For both H//ab and H//c,EuAg4As2 showed a positive,unexpectedly large magnetoresistance(up to 202%)in lower magnetic fields below TN1,and a large negative magnetoresistance(up to-78%)at high fields/intermediate temperatures,thus presenting potential applications in magnetic sensors.Finally,the magnetic phase diagrams of EuAg4As2 were constructed for both H//ab and H//c using the resistivity and magnetisation data. | QinQing Zhu Liang Li ZhiHua Yang ZheFeng Lou JianHua Du JinHu Yang Bin Chen HangDong Wang MingHu Fang | 2021 | Science China(Physics,Mechanics & Astronomy)2021，64，2： | 0 |
| 2 | The noncanonical role of the protease cathepsin D as a cofilin phosphatase显示文摘Cathepsin D(cathD)is traditionally regarded as a lysosomal protease that degrades substrates in acidic compartments.Here we report cathD plays an unconventional role as a cofilin phosphatase orchestrating actin remodeling.In neutral pH environments,the cathD precursor directly dephosphorylates and activates the actin-severing protein cofilin independent of its proteolytic activity,whereas mature cathD degrades cofilin in acidic pH conditions.During development,cathD complements the canonical cofilin phosphatase slingshot and regulates the morphogenesis of actin-based structures.Moreover,suppression of cathD phosphatase activity leads to defective actin organization and cytokinesis failure.Our findings identify cathD as a dual-function molecule,whose functional switch is regulated by environmental pH and its maturation state,and reveal a novel regulatory role of cathD in actin-based cellular processes. | Yi-Jun Liu Ting Zhang Sicong Chen Daxiao Cheng Cunjin Wu Xingyue Wang Duo Duan Liya Zhu Huifang Lou Zhefeng Gong Xiao-Dong Wang Margaret S.Ho Shumin Duan | 2021 | Cell Research2021，31，7： | 0 |
| 3 | Bulk superconductivity in the Dirac semimetal TlSb显示文摘A feasible strategy for realizing the Majorana fermions is searching for a simple compound with both bulk superconductivity and Dirac surface states.In this paper,we perform calculations of electronic band structure,the Fermi surface,and the surface states,and measure the resistivity,magnetization,and specific heat of a TlSb compound with a CsCl-type structure.The band structure calculations show that TlSb is a Dirac semimetal when spin-orbit coupling is considered.TlSb is first determined to be a type-Ⅱsuperconductor with T_(c)=4.38 K,Hc1(0)=148 Oe,H_(c2)(0)=1.12 T,andκ_(GL)=10.6.We also confirm that TlSb is a moderately coupled s-wave superconductor.Although we cannot determine the band near the Fermi level EF that is responsible for superconductivity,its coexistence with topological surface states implies that the TlSb compound may be a simple material platform to realize the fault-tolerant quantum computations. | YuXing Zhou Bin Li ZheFeng Lou HuanCheng Chen Qin Chen BinJie Xu ChunXiang Wu JianHua Du JinHu Yang HangDong Wang MingHu Fang | 2021 | Science China(Physics,Mechanics & Astronomy)2021，64，4： | 0 |
| 4 | Highly insulating phase of Bi_(2)O_(2)Se thin films with high electronic performance显示文摘Bi_(2)O_(2)Se is highly competitive as a candidate of next-generation high-performance semiconductors.Though dubbed as semiconductor,Bi_(2)O_(2)Se films exhibited high conductance,i.e.,metallic behavior,due to spontaneously ionized defects.Semiconducting/insulating films are of practical importance in broad applications based on low-power,high-performance electronics,the existence of which lacks firm evidence.Here,we synthesized highly insulating films in a controlled way,which exhibit semiconducting behavior with channel resistance up to 1 TΩ.The electron chemical potential lies within the band gap,in some cases,even below the charge neutrality level,signifying the trace of hole-type semiconducting.The performance of insulating devices remains high,comparable to high-quality devices previously.Especially,the threshold voltage(Vth)is positive,contrary to common negative values reported.Calculations indicate that our synthesis conditions suppress electron donors(Se vacancies(VSe))and promote the formation of compensating acceptors(Bi vacancies(VBi)),leading to insulating behaviors.Our work offers insights into electron dynamics of Bi_(2)O_(2)Se,moves one step further towards p-type transistors and provides a valuable playground for engineering ferroelectricity in high-performance semiconductors. | Tao Wang Zhuokai Xu Ziye Zhu Mengqi Wu Zhefeng Lou Jialu Wang Wanghua Hu Xiaohui Yang Tulai Sun Xiaorui Zheng Wenbin Li Xiao Lin | 2023 | Nano Research2023，16，2： | 0 |
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