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国家重点基础研究发展计划(2006CB921107)

作品数:7 被引量:5H指数:2
相关作者:郑东宁王宁张玉吴玉林储海峰更多>>
相关机构:中国科学院更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:理学一般工业技术电气工程电子电信更多>>

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Low temperature specific heat in BaFe_(1.9)Ni_(0.1)As_2 single crystals被引量:2
2010年
Low-temperature specific heat was measured on the BaFe1.9Ni0.1As2 single crystals with critical transition temperature Tc = 20.1 K.A clear specific heat jump with the value ΔC/T|Tc ≈ 23 mJ/mol K2 was observed.In addition,a roughly linear magnetic field dependence of the electronic specific heat coefficient Δγ(H) was found in the zero-temperature limit,suggesting that at least one Fermi pocket,probably the hole derivative one,was fully gapped with a small anisotropy in the present sample.A slight curvature of the curve Δγ(H) may suggest a complex gap structure(anisotropic gap or nodes) at other Fermi surfaces.
ZENG BinMU GangLUO HuiQianWEN HaiHu
Nb/Al-AlO_x/Nb junctions with controllable critical current density for qubit application被引量:1
2009年
Nb/Al-AlOx/Nb tunnel junctions with controllable critical current density Jc are fabricated using the standard selective Nb etching process. Tunnel barriers are formed in different oxygen exposure conditions (oxygen pressure P and oxidation time t), giving rise to Jc ranging from 100A/cm^2 to above 2000A/cm^2. Jc shows a familiar linear dependence on P×t in logarithmic scales. We calculate the energy levels of the phase- and flux-type qubits using the achievable junction parameters and show that the fabricated Nb/Al-AlOx/Nb tunnel junctions can be used conveniently for quantum computation applications in the future.
曹文会于海峰田野于洪伟任育峰陈赓华赵士平
关键词:FABRICATION
Sr_2CoO_(4-δ)薄膜中的自旋玻璃态的磁性质研究被引量:1
2010年
用脉冲激光沉积方法(PLD)在铝酸镧衬底上制备了c取向的高氧空位含量的锶钴氧薄膜.X射线衍射分析表明薄膜单一取向且没有明显杂相.原位的高气压反射式高能电子衍射仪(RHEED)监测显示,薄膜为层状生长.通过对薄膜磁化强度随温度、磁场及时间的变化曲线进行测量,发现零场冷曲线上可能存在两个特征温度:Tf和Ta.Tf为对应玻璃态的冻结温度而Ta对应少量的不缺氧锶钴氧团簇沿c轴的各项异性场的特征温度.磁弛豫、记忆效应和磁滞回线等进一步研究均表明体系中主要成分更可能是自旋玻璃,且在冻结温度之上自旋玻璃即开始了冻结.较高缺氧样品引入的三价钴离子和体系原有的四价钴离子共存,两者的共同效果形成了双交换和超交换作用的竞争,从而导致了系统复杂的自旋玻璃行为.
储海峰李洁李绍黎松林王佳高艳丽邓辉王宁张玉吴玉林郑东宁
关键词:自旋玻璃脉冲激光沉积
Fabrication of high-quality submicron Nb/Al-AlO_x/Nb tunnel junctions被引量:2
2008年
Nb/Al-AlOx/Nb tunnel junctions are often used in the studies of macroscopic quantum phenomena and superconducting qubit applications of the Josephson devices. In this work, we describe a convenient and reliable process using electron beam lithography for the fabrication of high-quality, submicron-sized Nb/Al-AlOx/Nb Josephson junctions. The technique follows the well-known selective Nb etching process and produces high-quality junctions with Vm=100 mV at 2.3 K for the typical critical current density of 2.2 kA/cm^2, which can be adjusted by controlling the oxygen pressure and oxidation time during the formation of the tunnelling barrier. We present the results of the temperature dependence of the sub-gap current and in-plane magnetic-field dependence of the critical current, and compare them with the theoretical predictions.
于海峰曹文会朱晓波杨海方于洪伟任育峰顾长志陈赓华赵士平
关键词:FABRICATION
Superconductivity in Ti-doped iron-arsenide compound Sr_4Cr_(0.8)Ti_(1.2)O_6Fe_2As_2
2009年
Superconductivity was achieved in Ti-doped iron-arsenide compound Sr4Cr0.8Ti1.2O6Fe2As2 (abbreviated as Cr-FeAs-42622). The X-ray diffraction measurement shows that this material has a layered structure with the space group of P4/nmm,and with the lattice constants a = b = 3.9003  and c = 15.8376 . Clear diamagnetic signals in ac susceptibility data and zero-resistance in resistivity data were detected at about 6 K,confirming the occurrence of bulk superconductivity. Meanwhile we observed a supercon-ducting transition in the resistive data with the onset transition temperature at 29.2 K,which may be induced by the nonuniform distribution of the Cr/Ti content in the FeAs-42622 phase.
ZHU XiYu,HAN Fei,MU Gang,CHENG Peng,SHEN Bing,ZENG Bin & WEN HaiHu National Laboratory for Superconductivity,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China
关键词:IRON-BASEDSUPERCONDUCTORSUPERCONDUCTORPEROVSKITE
基于偏振叠加和干涉两种方法的可控光脉冲延时器
2010年
可控的光信号延时在科研和通信领域有着广泛的应用.本文提出了两种可控光脉冲延时器的方案,分别基于偏振叠加和干涉原理.通过相位调制器的调制将光脉冲约束在一个环路中,需要时再释放,以达到光脉冲延时的目的.调节环路的长度和循环的次数便可以实现延时时间的可控.这两种方案均可以应用于全光纤光路中,通过集成光学技术可以实现微小尺寸的封装.基于偏振叠加的方案还可以方便地应用于自由空间光延时.
赵建领吴令安
关键词:偏振
Phase escape of current-biased Josephson junctions
2010年
Switching current distributions of an Nb/Al-AlO2/Nb Josephson junction are measured in a temperature range from 25 mK to 800 mK. We analyse the phase escape properties by using the theory of Larkin and Ovchinnikov (LO) which takes discrete energy levels into account. Our results show that the phase escape can be well described by the LO approach for temperatures near and below the crossover from thermal activation to macroscopic quantum tunneling. These results are helpful for further study of macroscopic quantum phenomena in Josephson junctions where discrete energy levels need to be considered.
曹文会于海峰田野陈赓华赵士平
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