Fe-based superconductors represent a fascinating class of materials,extensively studied for their complex interplay of superconductivity,magnetism,spin density waves,and nematicity,along with the interactions among th...Fe-based superconductors represent a fascinating class of materials,extensively studied for their complex interplay of superconductivity,magnetism,spin density waves,and nematicity,along with the interactions among these orders.An intriguing yet unexplained phenomenon observed in Fe-based superconductors is the emergence of superconductivity below 25K in the non-superconducting parent compound SrFe_(2)As_(2)following exposure to water at its surface.In this study,we employed in situ angle-resolved photoemission spectroscopy and low-energy electron diffraction to meticulously examine the electronic structure evolution of SrFe_(2)As_(2)upon in situ water dosing.Our findings indicate that water dosing markedly attenuates the spin density wave phase and surface Sr reconstruction while preserving the nematic order in SrFe_(2)As_(2).Furthermore,we detected an enhancement in the spectral weight of bands near the Fermi level.Our observations highlight the critical role of the intricate interplay among various orders induced by water dosing,which effectively modifies the band structure and favors the emergence of superconductivity in SrFe_(2)As_(2).展开更多
为了与低温共烧陶瓷(LTCC)技术兼容,采用热压烧结工艺在870℃制备了添加不同Bi_2O_3含量的SrFe_(12)O_(19)铁氧体材料,着重研究了材料的晶相组成、烧结密度、气孔率和磁性能等低温烧结特性。研究结果表明,材料在870℃烧结时,Bi_2O_3的...为了与低温共烧陶瓷(LTCC)技术兼容,采用热压烧结工艺在870℃制备了添加不同Bi_2O_3含量的SrFe_(12)O_(19)铁氧体材料,着重研究了材料的晶相组成、烧结密度、气孔率和磁性能等低温烧结特性。研究结果表明,材料在870℃烧结时,Bi_2O_3的添加促进了SrFe_(12)O_(19)晶相结构的形成,提高了材料的烧结致密度和磁性能。当Bi_2O_3的添加量(质量分数)为2%~4%,材料可以获得致密的结构,烧结密度达到4.65 g·cm^(-3)以上,气孔率低于10%,材料的饱和磁化强度Ms和内禀矫顽力Hci较高,分别达到252.4 k A·m^(-1)和312.9k A·m^(-1)以上。此外,基于SrFe_(12)O_(19)材料的低温烧结特性讨论了该材料在微波LTCC环行器当中的应用。展开更多
基金supported by the National Nature Science Foundation of China[Grant Nos.92365204 and 12274298(Z.K.Liu)]the National Key R&D program of China[Grant No.2022YFA1604400/03(Z.K.Liu)]Zhangjiang Laboratory(Y.M.Zhang).The authors thank BL02B at the Shanghai Synchrotron Radiation Facility supported by the National Natural Science Foundation of China(Contract No.11227902).
文摘Fe-based superconductors represent a fascinating class of materials,extensively studied for their complex interplay of superconductivity,magnetism,spin density waves,and nematicity,along with the interactions among these orders.An intriguing yet unexplained phenomenon observed in Fe-based superconductors is the emergence of superconductivity below 25K in the non-superconducting parent compound SrFe_(2)As_(2)following exposure to water at its surface.In this study,we employed in situ angle-resolved photoemission spectroscopy and low-energy electron diffraction to meticulously examine the electronic structure evolution of SrFe_(2)As_(2)upon in situ water dosing.Our findings indicate that water dosing markedly attenuates the spin density wave phase and surface Sr reconstruction while preserving the nematic order in SrFe_(2)As_(2).Furthermore,we detected an enhancement in the spectral weight of bands near the Fermi level.Our observations highlight the critical role of the intricate interplay among various orders induced by water dosing,which effectively modifies the band structure and favors the emergence of superconductivity in SrFe_(2)As_(2).
基金The Scientific Research Foundation of Education Office of Sichuan Province(13Z198)The Young and Middle-aged Academic Leaders of Scientific Research Funds of Chengdu University of Information Technology(J201222)
文摘为了与低温共烧陶瓷(LTCC)技术兼容,采用热压烧结工艺在870℃制备了添加不同Bi_2O_3含量的SrFe_(12)O_(19)铁氧体材料,着重研究了材料的晶相组成、烧结密度、气孔率和磁性能等低温烧结特性。研究结果表明,材料在870℃烧结时,Bi_2O_3的添加促进了SrFe_(12)O_(19)晶相结构的形成,提高了材料的烧结致密度和磁性能。当Bi_2O_3的添加量(质量分数)为2%~4%,材料可以获得致密的结构,烧结密度达到4.65 g·cm^(-3)以上,气孔率低于10%,材料的饱和磁化强度Ms和内禀矫顽力Hci较高,分别达到252.4 k A·m^(-1)和312.9k A·m^(-1)以上。此外,基于SrFe_(12)O_(19)材料的低温烧结特性讨论了该材料在微波LTCC环行器当中的应用。
