低 温 物 理 学 报

(DIWEN WULI XUEBAO)

第27卷  第1期  2005年2月

目  录

 

高温超导体Y1-xCaxBa2Cu3O7-δ和Y-123/Cax体系的超导输运特性研究

…………………冯喆韻  汪海英  黄参  潘庆谊  施利毅  徐克西  （1）

Cr80－xFe20Mnx (x=10, 15, 20)合金的低温电阻率和热导率

…………………李波  吴柏枚  高惠平  王明  杜衎  王小平  （8）

电泳共沉积含Ag的YBa2Cu3O7－δ厚膜…………李凤华  樊占国  刘常升  王珏（13）

Y1-xCaxBa2Cu3O7-δ烧结样品的直流输运特性

…………………………石庆平  冯喆韻  汪海英  黄参  徐克西 (18)

La0.7-x（Sm,Er,Dy）xSr0.3MnO3体系的相分离和渗流相变

……………………………………蔡之让  刘宁  童伟  徐素军 (25)

Bi2212体系的层间耦合对临界电流密度的影响

……………………………………………冯双久  陈春霞  李广  李晓光 (32)

Al和Fe替代对La0.67Ca0.33MnO3体系结构和M-I转变的影响

………崔玉建  贾广强  张玉凤  韩雁冰  王新燕  曹桂新  李金波 

周云  葛洪良  曹世勋  张金仓 (37)

混合物理化学气相沉积法（HPCVD）制备的MgB2超导厚膜样品的成分分析

……………………贾璋  郭荆璞  吕莹  王新峰  陈晋平  徐军  王晓楠 

朱萌  冯庆荣  (46)

低温下粗糙表面接触间隙气体热导的研究……………………徐瑞萍  徐烈  (54)

金属-绝缘层-铁磁/超导结的隧道谱与散粒噪声………………………李晓薇  (61)

La1-xAgxMnO3和La1-xNaxMnO3的对比研究

……………………………王广涛  张敏平  尚学府  戴宪起  方前锋  (67)

降温速率对La0.7Ca0.3Mn1－xCrxO3(x=0.00，0.08)电磁性质的影响

……………………………田建军  方军  王芳  黄真  陈治友  陈敬林  (74)

玻色气体的量子简并性对不可逆布雷顿制冷循环性能的影响

………………………………………………………杨宇霖  张悦  陈金灿  (79)

高温超导变压器中带材临界电流随磁场变化的研究

……………………………………………宋萌  李敬东  唐跃进  司汉松  (87)

低温大试样热胀系数测试………………………喻力弘  林鹏  张庆庚  张亮  (91)

 

 

 

 

 

 

 

CHINESE JOURNAL OF LOW TEMPERATURE PHYSICS

Vol.27   No.1   Feb.,  2005

CONTENTS

 

The Transport Properties of Y1-xCaxBa2Cu3O7-δ and Y-123/Cax Bulk Systems

……FENG ZHE-YUN,  WANG HAI-YING,  HUANG SHEN,  PAN QIN-YI,  SHI LI-YI,  XU KE-XI  (7)

Low Temperature Thermal Conductivity and Electrical Resistivity of Cr80－xFe20Mnx(x=10, 15, 20)

……………LI BO,  WU BAI-MEI,  GAO HUI-PING,  WANG MING,  DU KAN,  WANG XIAO-PING  (12)

Preparation of Ag Doped YBa2Cu3O7－δ Thick Films by Electrophoretic Coprecipitation

………………………………LI FENG-HUA,  FAN ZHAN-GUO,  LIU CHANG-SHENG,  WANG JUE  (17)

Transport Properties of Y1-xCaxBa2Cu3O7-δSintered Bulk

…………………SHI QING-PIN,  FENG ZHE-YUN,  HANG SHEN,  WANG HAI-YING,  XU KE-XI  (24)

The Separation and Percolation Transition　in La0.7-x (Sm,Er,Dy)xSr0.3Mno3　System

…………………………………………CAI ZHI-RANG,  LIU NING， TONG WEI， XU SU-JUN  (31)

The effect of interlayer coupling on critical current density in Bi2212 system

……………………………FENG SHUANG-JIU,  CHEN CHUN-XIA,  LI GUANG,  LI XIAO-GUANG  (36)

Influence of Al and Fe Substitution on Structure and M-I Transition for La2/3Ca1/3 MnO3 Perovskite

Manganese………… CUI YU-JIAN,  JIA GUANG-QIANG,  HAN YAN-BING,  ZHANG YU-FENG,CAO GUI-XIN,

 WANG XIN-YAN, LI JIN-BO,  ZHOU YUN,  CAO SHI-XUN,  ZHANG JIN-CANG  (45)

The study on component for MgB2 thick film prepared by HPCVD………JIA ZHANG,  GUO JING-PU, 

 Lü YING,WANG XIN-FENG,  CHEN JIN-PING,  XU JUN, WANG XIAO-NAN, ZHU MENG, FENG QING-RONG  (53)

Study of  the Gas Gap Conductance Between Rough Contact Surfaces at Low Temperature

………………………………………………………………………XU RUI-PING,  XU LIE  (60)

The differential conductance and shot noise in normal metal-insulator ferromagnet/superconductor

tunnel junctions…………………………………………………………………… LI XIAO-WEI  (66)

Comparative study La1-xAgxMnO3 and La1-xNaxMnO3…………WANG GUANG-TAO, ZHANG MIN-PING, 

SHANG XUE-FU,  DAI XIAN-QI,  FANG QIAN-FENG  (73)

The Magnetization and Resistivity in La0.7Ca0.3Mn1-xCrxO3-Δ(x=0.00, 0.08 Effects Of Cooling Speed On)

…TIAN JIAN-JUN,  FANG JUN,  WANG FANG,  HUANG ZHEN, CHEN ZHI-YOU, CHEN JING-LIN  (78)

The Influence of the Quantum Degeneracy of a Bose Gas on the Performance of an Irreversible

Brayton Refrigeration Cycle……………………………… YANG YU-LIN,ZHANG YUE, CHEN JIN-CAN  (86)

Study on the Ic-B Characteristics of Bi-2223 Tape Used in HTS Transformer

…………………………………… SONG MENG,  LI JING-DONG,  TAN YUE-JIN,  SI HAN-SONG  (90)

The Measurement of Thermal Expansion Coefficient of Some large size of specimen at Low Temperature

…………………………………… YU LI-HONG,  LIN PENG,  ZHANG QING-GEN,  ZHANG LIANG  (96)

 

 

 

 

 

高温超导体Y1-xCaxBa2Cu3O7-δ和Y-123/Cax

体系的超导输运特性研究

 

冯喆1  汪海英1  黄参1  潘庆谊2  施利毅2  徐克西1

                      上海大学物理系1，上海 200436

            上海大学化学系2，上海 200436

 

本文系统地研究了Y-123高温超导体Ca掺杂样品Y1-xCaxBa2Cu3O7-δ（x=0，0.1，0.2，0.3）和Y-123/Cax（x=0.1，0.2，0.3）样品的超导特性，对样品的临界温度Tc及输运特性进行了对比分析。实验发现：随着Ca含量增加两组样品的Tc有不同程度的递减，样品Y1-xCaxBa2Cu3O7-δ的Tc随Ca含量增加的变化规律正好与样品Y-123/Cax相反。Ca元素的加入使两组样品临界电流都有明显提高，但在Y-123/Cax中表现得更为明显，并且受磁场的影响更小。实验中还发现，Y1-xCaxBa2Cu3O7-δ的I～V曲线存在负磁阻区，而在Y-123/Cax中却没有发现。

 

关键词：铜氧化物超导体，钙掺杂，直流输运特性

PACC:   7430F, 7460J, 7460M

 

 

THE TRANSPORT PROPERTIES OF Y1-xCaxBa2Cu3O7-δ

AND Y-123/Cax BULK SYSTEMS

 

FENG ZHE-YUN1  WANG HAI-YING1  HUANG SHEN1

 PAN QIN-YI2  SHI LI-YI2    XU KE-XI1

1Physics Department of Shanghai University, Shanghai 200436

2Chemistry Department of Shanghai University, Shanghai 200436

 

We report systematic studies of the normal-state properties of Y1-xCaxBa2Cu3O7-δ(x=0，0.1，0.2，0.3) and Y-123/Cax(x=0.1，0.2，0.3) bulks in aspects of the critical temperature Tc and transport characterizations, respectively. As increasing of Ca content, all samples presented a Tc-decreasing with a different way.  In the case of the Y1-xCaxBa2Cu3O7-δ, the value of Tc decrease fast and then slowly, while in the case of Y-123/Cax, the Tc behavior presented a complete different way, in which Tc decrease slowly first and then fast. Ca-doping is able to improve the Ic more enhanced in the Y-123/Cax samples than in the Y1-xCaxBa2Cu3O7-δsamples. Additionally, for Y-123/Caxsamples, the critical current Ic is less sensitive to the external magnetic fields. Also, a negative resistant region was observed in the Y1-xCaxBa2Cu3O7-δ samples.

 

Key words:  High-Tc cuperate, doping, Y1-xCaxBa2Cu3O7-δ,Y－123/Cax, Transport properties

PACC:       7430F, 7460J, 7460M

 

 

 

Cr80－xFe20Mnx (x=10, 15, 20)合金

的低温电阻率和热导率

 

李波2  吴柏枚1,2  高惠平2  王明2  杜衎2  王小平3

1 中国科学技术大学 结构分析开放实验室

2 中国科学技术大学 物理系

3 北京有色金属研究总院

 

报道了Cr80－xFe20Mnx(x=10, 15, 20)合金在10-300K的电阻率和热导率。结果表明样品的电输运性质和热输运性质均与样品的磁状态有关。在SDW反铁磁转变附近，电阻率出现极小。对Neel温度以下电阻率-温度曲线拟合结果表明：取温度相关的能隙函数2A∝(TN-T)1/2可以很好地描述SDW反铁磁能隙随温度降低而打开的过程。合金在反铁磁转变温度以下表现出与无序样品或者玻璃态样品类似的热导率温度关系，这可能是源于合金中磁性团簇的散射。

 

关键词：CrFeMn合金，电阻率，热导率，SDW反铁磁

PACC:   7215E, 7530F, 7550E

 

LOW TEMPERATURE THERMAL CONDUCTIVITY

 AND ELECTRICAL RESISTIVITY OF

 Cr80－xFe20Mnx (x=10, 15, 20)

 

LI BO 2  WU BAI-MEI 1, 2  GAO HUI-PING 2  WANG MING 2

DU KAN 2   WANG XIAO-PING3

1 Structural Research Lab, University of Science and Technology of China

2 Department of Physics, University of Science and Technology of China

3 General Research Institute for Nonferrous Metals, Beijing

 

Thermal conductivity and electrical resistivity of Cr80－xFe20Mnx, x=10, 15, 20 are measured. It is found that the thermal and electrical transport properties are related to the magnetic state of these alloys. Near Neel temperature, a minimum is observed in electrical resistivity. The temperature dependence of electrical resistivity indicates the progressive opening up of the SDW antiferromagnetic energy gap and can be well described by a temperature-dependent function 2A∝(TN-T)1/2. Below Neel temperature, the alloys experiences similar thermal conductivity temperature dependence to the amorphous or glass sample due to the existence of scatterings from magnetic clusters.

 

Keywords: CrFeMn Alloy, Electrical Resistivity, Thermal Conductivity, SDW AFM

PACC:     7215E, 7530F, 7550E

 

 

电泳共沉积含Ag的YBa2Cu3O7－δ厚膜

李凤华  樊占国  刘常升  王珏

东北大学材料与冶金学院，沈阳 110004

 

电泳共沉积了含Ag的YBa2Cu3O7－δ厚膜。共沉积膜中的Ag含量随着原料中Ag量的增加而增加。YBa2Cu3O7－δ与Ag两种粒子吸附质子所带电量之间的关系为 QYBCO＝-0.1638QAg＋0.1519F。添加剂聚乙二醇消弱了固体粒子之间的静电斥力作用，使膜的表面光滑平整。在Ag基带表面有垂直于基带面的沿a-b面生长织构形成。

 

关键词：YBa2Cu3O7－δ；Ag；电泳共沉积；添加剂

PACC:  7475, 8120

 

PREPARATION OF Ag DOPED YBa2Cu3O7－δ

THICK FILMS BY ELECTROPHORETIC COPRECIPITATION

 

LI FENG-HUA  FAN ZHAN-GUO  LIU CHANG-SHENG  WANG JUE

College of material and metallurgy， Northeastern University，Shenyang 110004

 

Ag doped YBa2Cu3O7－δ thick films were prepared by electrophoretic coprecipitation. The contents of Ag in films increased with Ag addition in original powder mixture. The relation of coulomb values between YBa2Cu3O7－δ and Ag particle by absorbing protons was expressed as formula QYBCO＝-0.1638QAg＋0.1519F. Additive glycol weakened the repulsive electrostatic effect, which made the surface of films smooth. There was YBa2Cu3O7－δ texture formed on Ag substrate surface grown along a-b crystal plan. It might be induced by orientated Ag substrate.

 

Key words: YBa2Cu3O7－δ； Ag；electrophoresis； additive

PACC:      7475, 8120

 

 

Y1-xCaxBa2Cu3O7-δ烧结样品的直流输运特性

 

石庆平  冯喆韻  汪海英  黄参  徐克西

上海大学物理系  上海200436

 

本文主要报道了对烧结样品YBa2Cu3O7-δ(Y-123)进行部分元素替代的初步实验结果。用Ca2+部分替代Y3+形成的Y1-xCaxBa2Cu3O7-δ(YCBCO)样品呈现出如下特征：样品的正常态电阻率ρ随Ca的替代浓度增加而依次降低，而超导临界温度Tc也依次下降。这一现象与通常情况下对铜氧化物超导材料进行元素替代所引起的行为截然不同。实验还显示: 样品在低温下的临界电流密度Jc得到明显提高，掺Ca后烧结样品的临界电流受外磁场的影响明显减小。在弱磁场下，不同掺杂浓度样品的临界电流Ic随外磁场呈不同比例地线性下降，与一般颗粒多晶高温超导体临界电流Ic随外磁场行为明显不同。

 

关键词:   铜氧化物超导体    元素替代    晶界弱连接   临界电流

PACC:     7460, 7470

 

TRANSPORT PROPERTIES OF

 Y1-xCaxBa2Cu3O7-δSINTERED BULK

 

SHI QING-PIN  FENG ZHE-YUN  HANG SHEN  WANG HAI-YING  XU KE