低温物理学报
（DIWENWULIXUEBAO）
第28卷第1期2006年2月
目录
钙钛矿结构La1-xSrxCoO3(x=0.7,0.8,0.9,1.0)样品的铁磁相变和绝缘-金属转变…周新 马玉彬 连贵君 熊光成（1）
强钉扎高温超导体与永磁体系统的悬浮力数值模型………………………………………张亚莉 赵勇 宋宏海 (6)
实用高温超导混频器3mm锁相稳频源……………………………………………张亚凡 许伟伟 董晔 吴培亨 (13)
稀磁半导体Zn0.7Mn0.15Co0.15O
中的铁磁行为……………………………………………………………………………
……………………… 王永强 陈伟缪 菊红 任光明 肖循 肖利霞 商景林 袁力 刘胜 夏正才 (17)
电磁优化对提高Bi2223/Ag超导磁体性能的研究……… 王轶楠 李永旭 白质明 郭仁春 何砚发 王金星 (21)
晶粒尺寸对Pr0.5(Ca0.47Ba0.03)MnO3中台阶效应的影响………………王芳 方军 黄真 张勇 陈治友 陈敬林 (26)
不锈钢衬底MgB2厚膜韧性的研究…………………………… 陈莉萍 丁莉莉 庄承钢 张开诚 陈晋平 徐军 (31)
Si衬底上磁控溅射法生长MgO薄膜……………………………………………… 赵少奇 康琳 吴培亨 叶宇达 (36)
高温超导本征结的制备工艺和特性………………………张杰 闫生超 陈健 吉争鸣 康琳 许伟伟 吴培亨 (40)
前置放大器在高频信号检测系统中的作用…………………………………………龙利佳 陈健 覃朝东 吴培亨 (44)
用修改的Gandalf软件对HT-7U装置TF和PF线圈的稳定性分析…………………………黄亮 王秋良 余运佳 (49)
基于制冷机的高温超导谐波混频……………………………………………张祯 许伟伟 董晔 柯鸣岗 吴培亨 (53)
高温超导磁体指数损耗分析……………………………………………………………………张博 余运佳 王秋良 (57)
Eu替代浓度对Y1-xEuxBa2Cu3O7-δ体系电子结构和超导电性的影响…薛运才 李喜贵 苏玉玲 刘海增 陈镇平 (63)
Fe和Co离子在YBCO中团簇效应的理论和实验研究…李平林 张逸民 莫炯 陈常青 冀勇 刘丽华 张金仓 (67)
大电流冲击条件下高温超导线圈热稳定边界的数值求解…………………李晓航 王继业 陈刚 李渝 肖立业 (77)
快速测量单晶样品低温热电势的新方法……………………………………刘剑 瞿昊 柴一晟 杨宏顺 曹烈兆 (78)
力学性能对Bi-2223/Ag超导带材临界电流影响实验研究………………………………………………………………
………………………………………………宋春梅 吴云龙 刘华军 教晓东 王正道 熊玉峰 李来风 (82)
Cr掺杂对Nd0.7Sr0.3MnO3电磁性质的影响…………………………田建军 方军 王芳 黄真 陈治友 陈敬林 (86)
稀土化合物Pr3Co的低温磁性研究………………………路莹 李玉山 路庆凤 梅原出 安達義也 佐藤清雄 (90)
超导块材间狭窄缝隙中静磁场分布简化计算方法及应用…………………………………王厚生 戴银明 王秋良 (94)
CHINESE
JOURNAL OF LOW THEMPERATURE PHYSICS
VOL.28NO.1Feb.,2006
CONTENTS
Study
of Electrical and Magnetic Properties of Polycrystal La1-xSrxCoO3-δ(0.7≤x≤1)…………………………………
…………………………………………………ZHou Xin，Ma Yu-Bin，Lian Gui-Jun，Xiong Guang-CHeng （5）
Numerical
Model of Levitation Force Between a YBCO Bulk With Strong Pinning Force and a Permanent
Magnet…
…………………………………………………………………………ZHang Ya-Li,ZHao Yong,Song
Hong-Hai (12)
Practical
3mm Phase Locking Frequency Stabilized Source with High Temperature
Superconductor Mixer………
…………………………………………………………………ZHang Ya-Fan,Xu Wei-Wei,Dong
Ye,Wu Pei-Heng (16)
Ferromagnetic
Behavior of Zn0.7Mn0.15Co0.15O Diluted
Magnetic Semiconductor…………………Wang Yong-Qiang,
CHen
Wei,Miao Ju-Hong,Ren Guan-Ming,Xiao Xun,Xiao Li-Xia,SHang Jing-Lin, Yuan Li,Liu SHeng,Xia ZHeng-Cai (20)
Study
On Electromagnetic Optimize Bi2223/Ag Superconducting Magnet……………………………………………
………………………………Wang Yi-Nan1,Li Yong-Xu,Bai
ZHi-Ming,Guo Ren-CHun,He Yan-FaWang Jin-Xing (25)
Grain
Size Effect on the Multistip-Like Behavior in Pr0.5(Ca0.47Ba0.03)MnO3……………………………………………
…………………………………Wang Fang,Fang Jun,Huang
ZHen,ZHang Yong,CHen ZHi You,CHen Jing Ling (30)
Study
on Ductility for the Stainless Steel Substrate MgB2 Thich Film…CHen Li-Ping,Ding Li-LI,ZHuang
CHeng-Gang,
ZHang Kai-CHeng,CHen ChinpingmXu Jun,An
Ling, Xiong Guang-CHeng,Feng
Qing-Rong (35)
Growth
of MgO Thin Films on Si Substrates by Magnetron Sputtering…ZHao SHao-Qi,Kang Lin,Wu
Pei-Heng,Ye Yu-Da(39)
Fabrication
Technology and Characteristics of Intrinsic Josephson Junctions…………………………………
………………………ZHang Jie,Yan SHeng-CHao,CHen
Jian,Ji ZHeng-Ming,Kang Lin,Xu Wei-Wei,Wu Pei-Heng (43)
Effect
of Pre-Amplifiers with Different Noise Livels in High Frequency Signal
Detecting System………………
………………………………………………………………Long Li-Jia,CHen Jian,Qin
CHao-Dong,Wu Pei-Heng (48)
Stability
Analysis of the HT-7U TF and PF
Conductors Using the Revised Code Gandalf………………………
……………………………………………………………………………Huang-Liang,Wang Qiu-Liang,Yu
Yun-Jia (52)
High
Temperature Superconductor Harmonic Mixing Mounted on Cryocooler……………………………………
………………………………………………………ZHang ZHen,Xu Wei-Wi,Dong
Ye,Ke Ming-Gang,Wu Pei-Heng (56)
Study
on Hts Magnet Index L………………………………………………………ZHang Bo,Yu Yun-Jia,Wang
Qiu-Liang (62)
Nfluence
of Eu Substitute Content on the Localized Electron Structure and the
Superconductivity Y1-xEuxBa2Cu3O7-δ System
…………………………………………………Xue Yun-Cai,Li Xi-Gui,Su
Yu-Ling,Liu Hai-Zeng,CHen ZHen-Ping
(66)
Theoretic
and Experimental Research on Cluster Effect of Magnetic Ion Fe and Co In YBCO………………………
………………………Li Ping-Lin,ZHang Yi-Min,Mo
Jong,CHen CHang-Qing,Ji Yong,Liu Li-Hua,ZHang Jin-Cang (72)
Numerical
Evaluation for the Thermal Stability Profile in High Temperature
Superconductive Coil Working with High Current
Shock…………………………………………………………………Li Xiao-Hang,Wang Ji-Ye,Chen
Gang,Li Yu,Xiao Li-Ye (73)
A
Fast Method for Thermopower Measurements on Single Crystal Samples…………………………………………
……………………………………………………Liu Jian,Qu Hao,CHai
Yi-SHeng,Yang Hong-SHun,Cao Lie-Zhao (81)
Study
on the Effects of Mechanical Properties on Critical Current of Bi-2223/Ag Tapes……………………………
…………Song CHun-Mei,Wu Yun-Long,Liu
Hua-Jun,Jiao Xiao-Dong,Wang Zheng-Dao,Xiong Yu-Feng,Li Lai-Feng (85)
Effects
of Cr Doping on the Magnetization and Resistivity in Nd0.7Sr0.3Mn1-xCrxO3…………………………………
………………………………………Tian Jian-Jun,Fang Jun,Wang
Fang,Huang ZHen,CHen Hi-You,CHen Jing-Lin (89)
Study
of Magnetic Properties at Low Temperature for Rare Earth Compound Pr3Co………………………………
………………………………………Lu Ying,Li Yu-SHan,Wang
Hai-Ying,Lu Qing-Feng,I.Umehara,Y.Adachi,K.Sato (93)
Simplified
Calculation of Static Magnetic Field in the Thin Gap Among Superconductor
Blocks and Its Application Sample
………………………………………………………………………………………Wang Hou-SHeng,Wang Qin-Liang (96)
钙钛矿结构La1-xSrxCoO3(x=0.7,0.8,0.9,1.0)样品的铁磁相变和绝缘-金属转变*
周新 马玉彬 连贵君 熊光成
北京大学物理学院，100871 北京
利用固相反应法及溶胶凝胶法我们制备了多晶La1-xSrxCoO3(x=0.7,0.8,0.9,1.0)样品.X射线衍射谱表明，La1-xSrxCoO3样品呈ABO3型钙钛矿结构，晶格常数随着x的增加而增大.与钙钛矿结构的锰氧化物类似，电阻率随温度变化以及磁化强度随温度变化的关系强烈依赖于掺杂浓度.x＝0.7和0.8的样品在低温下显示铁磁性，而x＝0.9和1.0的样品磁化强度随温度变化没有显示铁磁转变.电阻率随温度的变化似乎与磁化率测量相对应，在x＝0.8和0.9样品之间存在绝缘-金属转变.
关键词： La1-xSrxCoO3，钙钛矿结构，双交换模型
PACC： 6100,7550G，7280T
STUDY
OF ELECTRICAL AND MAGNETIC PROPERTIES OF POLYCRYSTAL La1-xSrxCoO3-δ(0.7≤x≤1)
ZHou Xin Ma Yu-Bin Lian
Gui-Jun Xiong Guang-CHeng
Department
of Physics, Peking University, Beijing
100871
(Received 28 April,2005)
Perovskites La1-xSrxCoO3
(x=0.7, 0.8, 0.9 and 1) samples were synthesized by sol-gel and solid
state reaction methods. Structures were characterized and lattice constants
were obtained by X-ray diffraction pattern. The temperature dependence of
electrical resistivity, the ferromagnetic-paramagnetic transition temperature (Tc)
and magnetization under the same magnetic field depend strongly on Co3+Co4+
ratio, which can be explained by double-exchange interaction.
Keywords: La1-xSrxCoO3，perovskites, double-exchange
interaction
PACC: 6100,7550G，7280T
强钉扎高温超导体与永磁体系统的悬浮力数值模型
张亚莉 赵勇 宋宏海
材料先进技术教育部重点实验室，西南交通大学超导研究开发中心
西南交通大学152信箱，四川成都610031
本文从数值模拟和实验两方面研究了熔融织构Y-Ba-Cu-O（YBCO）高温超导块材与永磁体组成的磁悬浮系统的悬浮特性.通过理论与实验结果的比较，在Hikihara-Moon超导磁悬浮动力学唯像模型的基础上，提出了强钉扎磁悬浮力模型，并进一步研究了熔融织构YBCO块材在不同条件下的悬浮特性，包括：场冷高度（FCH）和零场冷却(ZFC)的对磁浮力的影响，以及由不同运动速度导致的磁悬浮力的变化等.结果表明，强钉扎磁悬浮力模型适合于精确描述由熔融织构YBCO高温超导块材与永磁体所组成的磁悬浮系统的悬浮特性.
关键词： 超导磁悬浮模型，悬浮力，熔融织构YBCO
PACC:7470L,7490
NUMERICAL
MODEL OF LEVITATION FORCE BETWEEN A YBCO BULK WITH STRONG PINNING FORCE AND A
PERMANENT MAGNET
ZHang Ya-Li ZHao Yong Song
Hong-Hai
Key
Laboratory of Advanced Technologies of Materials (Ministry of Education of
China),
Superconductivity
R&D Center (SRDC), Southwest Jiaotong University, Chengdu, 610031
(Received 8 June, 2005;revised manuscript
received 10 August,2005)
The characteristics of
levitation force of the system consisted of a melt-texture YBCO
high-temperature superconductor (HTS) bulk and a permanent magnet (PM) is
researched by the two sides of numerical simulation and experiment in this
paper. After we compared the results of simulation and experiment again and
again, on the basic of the model of levitation dynamics between a HTS bulk and
a PM given by Hikihara and Moon, we put forward the numerical model of
levitation force between a YBCO bulk with strong pinning effect and a PM (the
model with strong pinning effect). and we investigate the levitation
characteristics of the system which be consisted of a melt-textured YBCO bulk
and a PM under different conditions, including the effect of field cooling
height (FCH), the effect of zero-field-cooling (ZFC) and the effect due to the
velocity of reverse motion between HTS and PM. The numerical simulation results
using the model with strong pinning effect prove the model with strong pinning
effect is fit to accurately describe the characteristics of the levitation
force of the system consisted of a melt-texture YBCO HTS bulk and a PM.
Keywords:
numerical model, levitation force,
melt-texture YBCO
PACC:
7470L, 7490
实用高温超导混频器3mm锁相稳频源
张亚凡 许伟伟
董晔 吴培亨
南京大学电子科学与工程系，南京210093
基于小型脉冲管制冷机，设计并改善了与其配套的锁相混频系统，用约瑟夫森颗粒边界结实现了高温超导3mm波段96次谐波混频，完成了60次谐波下压控振荡器的锁相稳频实验.首次实现了基于小型脉冲管制冷机的实用高温超导混频器3mm锁相稳频源.
关键词： 谐波混频锁相，约瑟夫森结，脉冲管制冷机
PACC:
7400,7450,9410L
PRACTICAL
3MM PHASE LOCKING FREQUENCY STABILIZED
SOURCE
WITH HIGH TEMPERATURE SUPERCONDUCTOR MIXER
ZHang Ya-Fan Xu Wei-Wei Dong
Ye Wu Pei-Heng
Nanjing
University Electronics and Engineering Department, Nanjing
210093
(Received 7 March,2005; revised
manuscript received 26 May,2005)
On the basis of pulse tube
cryocooler, we designed suited electromagnetic shielding system with the
function of microwave coupling, IF measuring, mixing and phase locking. After
improved this system, we successfully used Josephson grain boundary junction to
actualize high temperature superconductor 96 harmonic wave mixing in 3mm
waveband and 60 harmonic wave phase locking experiment of voltage control
oscillator. Based on pulse tube cryocooler, for the first time, we realized
this practical frequency stabilized source of high temperature superconductor
mixer in 3mm phase locking.
Keywords:
Harmonic Frequency Mixing, and Phase Locking, Josephson Junction, Cryocooler
Pacc:7400,7450,9410L
稀磁半导体Zn0.7Mn0.15Co0.15O中的铁磁行为
王永强 陈伟缪
菊红 任光明 肖循
肖利霞
商景林 袁力
刘胜 夏正才
华中科技大学物理系，武汉 430074
用固相反应法在不同温度下制备了名义组分为Zn0.7Mn0.15Co0.15O的Mn、Co共掺杂ZnO块状样品，并研究了烧结温度（Ts）对其结构和磁性质的影响。结构研究表明：掺杂样品除ZnO纤锌矿结构外还存在第二相，且第二相与Ts有关。磁测量表明，所有样品低温（约低于50K）下呈现铁磁行为，但其行为在Ts≤700℃和Ts>700℃时表现出明显的不同。对低温烧结的样品，磁有序程度随Ts增加而增强，而对较高温度烧结的样品，磁有序程度随Ts增加而减弱。结合结构分析，文中就这些观察的可能起因进行了讨论。
关键词： 稀磁半导体，铁磁有序，反铁磁耦合作用
PACC： 7550P, 7650, 8140R
FERROMAGNETIC
BEHAVIOR OF Zn0.7Mn0.15Co0.15O DILUTED
MAGNETIC SEMICONDUCTOR
Wang Yong-Qiang CHen Wei Miao
Ju-Hong Ren Guan-Ming Xiao Xun
Xiao Li-Xia SHang Jing-Lin
Yuan Li Liu ShengXia ZHeng-Cai
Department
of Physics, Huazhong University of Science and Technology, Wuhan430074
(Received 03 March,2005)
Mn、Co co-doped ZnO bulk samples
with nominal composition Zn0.7Mn0.15Co0.15O
were fabricated by the standard solid-state reaction method. The effect of
sintering temperature (Ts) on structure and magnetic behavior
was studied. The structural analysis shows that beside the wurtzite structure
of ZnO, all the samples contain secondary phase which is sensitive to Ts.
Magnetization measurement indicates that all the samples are ferromagnetic
ordering at low temperatures (T<50K), but the behavior of the samples
sintered at lower Ts
(≤700℃) is different from that of
the samples sintered at higher Ts (>700℃). For the samples prepared at
Ts≤700℃, ferromagnetic ordering
increase with the increase of Ts, while for the samples
prepared at Ts>700 ℃, ferromagnetic ordering decrease
with the increase of Ts. Based on the structural analyses,
the experimental observation is discussed.
Keywords:
diluted magnetic semiconductor, ferromagnetic ordering, anti-ferromagnetic
coupling interaction
PACC:7550P,
7650, 8140R
电磁优化对提高Bi2223/Ag超导磁体性能的研究
王轶楠1 李永旭2
白质明1 郭仁春1
何砚发1 王金星1
1东北大学物理系，沈阳，110006;2东软数字医疗系统有限责任公司，沈阳110179
在Bi2223/Ag超导磁体里，磁场的径向分量是限制其超导带临界电流和性能的主要因素之一.我们用有限元方法分析了螺线管超导磁体场强的分布，发现磁体两端磁场的径向分量最大，通过在其两端增加铁磁性导磁结构，优化其磁场分布，降低磁体端部径向磁场强度，提高了磁体的临界电流，增强了超导磁体承受过电流脉冲冲击的能力，并有效地加速了磁体在过电流冲击后的恢复速度.
关键词： 高温超导磁体，有限元方法，电磁优化，Bi2223/Ag超导磁体稳定性
PACC： 7470， 7490
STUDY
ON ELECTROMAGNETIC OPTIMIZE Bi2223/Ag SUPERCONDUCTING MAGNET
Wang Yi-Nan1 Li Yong-Xu2 Bai ZHi-Ming1 Guo Ren-CHun1
He Yan-Fa1 Wang Jin-Xing1
1Northestern
University，Shenyang110006
2NEUSOFT
digital medical system Ltd. Co.，Shenyang 110179
(Received 15 March,2005; revised
manuscript received 11 April 2005)
Abstract: Radial component
of magnetic field is one of main limits of Bi2223/Ag magnet’s critical current
and stability. Finite Element Method (FEM) is used to analyze magnetic field
distribution. And a pair of ferromagnetic disk is set on both magnet’s end to
optimize its magnetic field distribution. We measured magnets critical current and
recovery time after a over current pulse with and without ferromagnetic disks.
The results showed that setting the disks increased the critical current and
stabilize magnet.
Keywords： HTS，FEM，electromagnetic optimize，Bi2223/Ag magnet stability
PACC： 7470，7490