JPH05139893A - Production of superconductive thin film - Google Patents

Production of superconductive thin film

Info

Publication number
JPH05139893A
JPH05139893A JP3299028A JP29902891A JPH05139893A JP H05139893 A JPH05139893 A JP H05139893A JP 3299028 A JP3299028 A JP 3299028A JP 29902891 A JP29902891 A JP 29902891A JP H05139893 A JPH05139893 A JP H05139893A
Authority
JP
Japan
Prior art keywords
film
amorphous film
single crystal
thin film
amorphous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP3299028A
Other languages
Japanese (ja)
Inventor
Hiromi Takei
廣見 武井
Yasuko Torii
靖子 鳥居
Katsuya Hasegawa
勝哉 長谷川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP3299028A priority Critical patent/JPH05139893A/en
Publication of JPH05139893A publication Critical patent/JPH05139893A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Landscapes

  • Crystals, And After-Treatments Of Crystals (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

PURPOSE:To form superconductive thin film having good crystal property and surface smoothness. CONSTITUTION:The method comprises the steps of forming an amorphous film 2 capable of producing an superconductive phase on a single crystal substrate; heating the amorphous film 2 to a temperature melting the amorphous film 2; and forming an superconductive phase film crystallographically having a good crystal property relation with a single crystal substrate 1 by gradually cooling the heated film.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、基板上に超電導薄膜
を形成する方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a superconducting thin film on a substrate.

【0002】[0002]

【従来の技術】YBa2 Cu3 x などのイットリウム
系超電導薄膜、ならびにBi2 CaSr2 Cu2 8
よびBi2 Ca2 Sr2Cu3 10などのビスマス系超
電導薄膜は、スパッタリング法、レーザアブレーション
法、およびMBE法などにより従来より作製されてい
る。
2. Description of the Related Art Yttrium-based superconducting thin films such as YBa 2 Cu 3 O x and bismuth-based superconducting thin films such as Bi 2 CaSr 2 Cu 2 O 8 and Bi 2 Ca 2 Sr 2 Cu 3 O 10 are formed by a sputtering method, a laser method. It is conventionally produced by an ablation method, an MBE method, or the like.

【0003】またTl2 CaBa2 Cu2 8 およびT
2 Ca2 Ba2 Cu3 10などのタリウム系超電導薄
膜は、Ca−Ba−Cu−Oプリカーサ膜のTl蒸気中
での熱処理などによって作製できることが知られてい
る。
Also, Tl 2 CaBa 2 Cu 2 O 8 and T
thallium-based superconducting thin film such as l 2 Ca 2 Ba 2 Cu 3 O 10 is known to be produced by such heat treatment in Tl vapor Ca-Ba-Cu-O precursor film.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、イット
リウム系薄膜は、比較的結晶性の良好なものを得ること
ができるが、臨界温度(Tc)が100K以下である。
However, although the yttrium-based thin film can have a relatively good crystallinity, the critical temperature (Tc) is 100 K or less.

【0005】ビスマス系およびタリウム系の超電導薄膜
では、臨界温度(Tc)が100Kを超える薄膜が報告
されているが、非超電導相が分散しており、元素の偏析
および格子欠陥が存在している。また薄膜の表面には大
きな凹凸が存在し、結晶性および表面平滑性などの膜の
性質において良好なものが得られていない。
With respect to bismuth-based and thallium-based superconducting thin films, it has been reported that the critical temperature (Tc) exceeds 100K, but non-superconducting phases are dispersed, and element segregation and lattice defects exist. .. Further, there are large irregularities on the surface of the thin film, and good film properties such as crystallinity and surface smoothness have not been obtained.

【0006】この発明の目的は、結晶性および表面平滑
性に優れた超電導薄膜を製造する方法を提供することに
ある。
An object of the present invention is to provide a method for producing a superconducting thin film excellent in crystallinity and surface smoothness.

【0007】[0007]

【課題を解決するための手段】この発明の製造方法は、
単結晶基板上に超電導相となり得るアモルファス膜を形
成する工程と、アモルファス膜をアモルファス膜が溶融
する温度に加熱する工程と、加熱した膜を徐冷すること
によって単結晶基板と結晶学的に晶癖関係を有する超電
導相膜を形成する工程とを備えている。
The manufacturing method of the present invention comprises:
A step of forming an amorphous film that can be a superconducting phase on the single crystal substrate, a step of heating the amorphous film to a temperature at which the amorphous film melts, and a crystallographically crystallized crystal with the single crystal substrate by gradually cooling the heated film. And a step of forming a superconducting phase film having a habit relationship.

【0008】この発明において単結晶基板として用いら
れるものとしては、たとえば、MgO、SrTiO3
およびLaAlO3 などである。
The single crystal substrate used in the present invention is, for example, MgO, SrTiO 3 ,
And LaAlO 3 .

【0009】この発明が適用される超電導薄膜の組成は
特に限定されるものではないが、従来の方法では結晶性
および表面平滑性の良いものが得られにくいビスマス系
およびタリウム系などの超電導薄膜に適用すると特に有
用である。
The composition of the superconducting thin film to which the present invention is applied is not particularly limited, but a bismuth-based or thallium-based superconducting thin film which is difficult to obtain with good crystallinity and surface smoothness by the conventional method can be used. It is especially useful when applied.

【0010】タリウム系超電導薄膜の場合、種々の組成
のものが知られている。たとえばアモルファス膜の組成
がTl、Ca、Ba、およびCuであれば、超電導相と
しては、Tl2 CaBa2 Cu2 8 またはTl2 Ca
2 Ba2 Cu310の組成のものを形成させることがで
きる。
In the case of thallium-based superconducting thin films, those having various compositions are known. For example, if the composition of the amorphous film is Tl, Ca, Ba, and Cu, the superconducting phase may be Tl 2 CaBa 2 Cu 2 O 8 or Tl 2 Ca.
A composition of 2 Ba 2 Cu 3 O 10 can be formed.

【0011】またアモルファス膜の組成が、Tl、C
a、Sr、およびCuに、Biおよび/またはPbを含
んだ組成であれば、超電導相としては、(Tl,Bi,
Pb)CaSr2 Cu2 7 または(Tl,Bi,P
b)Ca2 Sr2 Cu3 9 のものを形成させることが
できる。
The composition of the amorphous film is Tl, C
If the composition contains Bi and / or Pb in a, Sr, and Cu, the superconducting phase is (Tl, Bi,
Pb) CaSr 2 Cu 2 O 7 or (Tl, Bi, P
b) Ca 2 Sr 2 Cu 3 O 9 can be formed.

【0012】図1は、この発明に従い、単結晶基板1の
上にアモルファス膜2を形成した状態を示す断面図であ
る。この発明において、アモルファス膜の形成方法は特
に限定されるものではないが、たとえばスパッタリング
法、MBE法および多元蒸着法などにより作製すること
ができる。
FIG. 1 is a sectional view showing a state in which an amorphous film 2 is formed on a single crystal substrate 1 according to the present invention. In the present invention, the method for forming the amorphous film is not particularly limited, but the amorphous film can be formed by, for example, a sputtering method, an MBE method, a multi-source deposition method, or the like.

【0013】このようにして形成したアモルファス膜を
加熱して、アモルファス膜を溶融させる。タリウム系超
電導薄膜を形成させる場合には、たとえばこの加熱の際
の雰囲気をTl蒸気およびO2 気流中で行なうことによ
り、組成ずれを調整することができる。その後この溶融
した膜を徐冷することにより単結晶基板上に、単結晶基
板と結晶学的に晶癖関係を有する超電導相膜を形成する
ことができる。
The amorphous film thus formed is heated to melt the amorphous film. When forming a thallium-based superconducting thin film, the composition deviation can be adjusted, for example, by performing the atmosphere during this heating in Tl vapor and O 2 gas flow. Then, the melted film is gradually cooled to form a superconducting phase film having a crystallographic relationship with the single crystal substrate on the single crystal substrate.

【0014】図2は、このようにして形成した結晶性の
超電導相膜3を示す断面図である。この発明においてア
モルファスを加熱する温度はアモルファス膜が溶融する
温度であり、アモルファス膜の融点より10〜50℃高
い温度が好ましい。
FIG. 2 is a sectional view showing the crystalline superconducting phase film 3 thus formed. In the present invention, the temperature at which the amorphous film is heated is the temperature at which the amorphous film melts, and is preferably 10 to 50 ° C. higher than the melting point of the amorphous film.

【0015】また溶融した膜を徐冷する際の冷却速度
は、0.1℃/時間〜100℃/時間が好ましい。
The cooling rate for gradually cooling the melted film is preferably 0.1 ° C./hour to 100 ° C./hour.

【0016】[0016]

【作用】この発明の製造方法では、単結晶基板上にアモ
ルファス膜を形成している。このため任意の組成に精度
よく制御しながら薄膜を形成することができる。
In the manufacturing method of the present invention, the amorphous film is formed on the single crystal substrate. Therefore, it is possible to form a thin film while controlling the composition to an arbitrary composition with high precision.

【0017】この発明では、次にこのアモルファス膜を
加熱して溶融した後徐冷することによって超電導相膜を
形成している。この際単結晶基板と結晶学的な晶癖関係
を保ちながら超電導相膜が形成されるので、結晶性の良
好な薄膜を形成することができる。
In the present invention, the superconducting phase film is then formed by heating and melting the amorphous film and then gradually cooling it. At this time, since the superconducting phase film is formed while maintaining the crystallographic habit relationship with the single crystal substrate, a thin film having good crystallinity can be formed.

【0018】図3は、この発明における加熱および徐冷
の工程におけるアモルファス膜の温度の変化を示す図で
ある。
FIG. 3 is a diagram showing changes in the temperature of the amorphous film during the heating and slow cooling steps in the present invention.

【0019】図3に示すように融点よりもやや高い温度
に加熱した後徐冷することが好ましい。
As shown in FIG. 3, it is preferable to heat to a temperature slightly higher than the melting point and then gradually cool.

【0020】[0020]

【発明の効果】この発明の製造方法に従えば、結晶性お
よび表面平滑性の良好な薄膜を得ることができるので、
J−J素子、SQUID、および共振器などエレクトロ
ニクス分野の超電導素子に応用して、ノイズおよびロス
の低減された素子特性の向上を期待することができる。
According to the manufacturing method of the present invention, a thin film having good crystallinity and surface smoothness can be obtained.
Application to superconducting devices in the electronics field such as JJ devices, SQUIDs, and resonators can be expected to improve device characteristics with reduced noise and loss.

【0021】[0021]

【実施例】焼結体ターゲットを用いたスパッタリング法
および多元蒸着法により、アモルファス膜を作製した。
基板としてはMgO(実験No.1,3,6)、SrTi
3 (実験No.2,4,7)、およびLaAlO3 (実
験No.5,8)を用いた。また蒸着中における基板温度
は室温とした。
[Example] Sputtering method using a sintered body target
An amorphous film was produced by the multi-source vapor deposition method.
As the substrate, MgO (Experiment No. 1, 3, 6), SrTi
O 3(Experiment No. 2, 4, 7), and LaAlO3(Actually
Test No. 5, 8) was used. Also, the substrate temperature during vapor deposition
Was at room temperature.

【0022】スパッタリング法においては、焼結体ター
ゲットの組成を調整することにより形成する膜の組成を
調整した。また多元蒸着法では、各元素の蒸着速度を制
御することにより、形成する膜の組成を調整した。形成
した膜がアモルファス状態であることは、X線回折で確
認した。
In the sputtering method, the composition of the formed film was adjusted by adjusting the composition of the sintered target. In the multi-source vapor deposition method, the composition of the film to be formed was adjusted by controlling the vapor deposition rate of each element. It was confirmed by X-ray diffraction that the formed film was in an amorphous state.

【0023】表1に示すように、形成したアモルファス
膜を850〜1000℃に加熱した後、0.2〜20℃
/時間の速度で冷却した。作製した薄膜は、X線回折に
よる結晶構造解析、SEMによる表面観察、EDXによ
る組成分析を行なった。また、電気抵抗−温度曲線を測
定して、臨界温度(Tc)を求めた。その結果を表1に
示す。
As shown in Table 1, after heating the formed amorphous film to 850 to 1000 ° C., 0.2 to 20 ° C.
Cooled at a rate of / hour. The produced thin film was subjected to crystal structure analysis by X-ray diffraction, surface observation by SEM, and composition analysis by EDX. Further, the electric resistance-temperature curve was measured to determine the critical temperature (Tc). The results are shown in Table 1.

【0024】[0024]

【表1】 [Table 1]

【0025】表1から明らかなように、この発明に従い
形成された超電導相膜は、c軸が基板に垂直に配向した
良好な結晶性を示し、また表面は極めて平滑である。
As is clear from Table 1, the superconducting phase film formed according to the present invention has good crystallinity with the c-axis oriented perpendicular to the substrate, and the surface is extremely smooth.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明に従い単結晶基板上にアモルファス膜
を形成した状態を示す断面図である。
FIG. 1 is a cross-sectional view showing a state in which an amorphous film is formed on a single crystal substrate according to the present invention.

【図2】この発明に従い単結晶基板上に形成したアモル
ファス膜を加熱した後徐冷して超電導相膜を形成した状
態を示す断面図である。
FIG. 2 is a cross-sectional view showing a state in which an amorphous film formed on a single crystal substrate according to the present invention is heated and then gradually cooled to form a superconducting phase film.

【図3】この発明に従いアモルファス膜を加熱した後徐
冷する工程における膜温度の変化を示す図である。
FIG. 3 is a diagram showing a change in film temperature in a process of heating an amorphous film and then gradually cooling it according to the present invention.

【符号の説明】[Explanation of symbols]

1 単結晶基板 2 アモルファス膜 3 超電導相膜 1 Single crystal substrate 2 Amorphous film 3 Superconducting phase film

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 単結晶基板上に超電導相となり得るアモ
ルファス膜を形成する工程と、 前記アモルファス膜を、前記アモルファス膜が溶融する
温度に加熱する工程と、 前記加熱した膜を徐冷することによって、前記単結晶基
板と結晶学的に晶癖関係を有する超電導相膜を形成する
工程とを備える、超電導薄膜の製造方法。
1. A step of forming an amorphous film capable of forming a superconducting phase on a single crystal substrate, a step of heating the amorphous film to a temperature at which the amorphous film melts, and a step of gradually cooling the heated film. And a step of forming a superconducting phase film having a crystallographic habit relationship with the single crystal substrate.
JP3299028A 1991-11-14 1991-11-14 Production of superconductive thin film Withdrawn JPH05139893A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3299028A JPH05139893A (en) 1991-11-14 1991-11-14 Production of superconductive thin film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3299028A JPH05139893A (en) 1991-11-14 1991-11-14 Production of superconductive thin film

Publications (1)

Publication Number Publication Date
JPH05139893A true JPH05139893A (en) 1993-06-08

Family

ID=17867285

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3299028A Withdrawn JPH05139893A (en) 1991-11-14 1991-11-14 Production of superconductive thin film

Country Status (1)

Country Link
JP (1) JPH05139893A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6461484B2 (en) 2000-09-13 2002-10-08 Anelva Corporation Sputtering device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6461484B2 (en) 2000-09-13 2002-10-08 Anelva Corporation Sputtering device

Similar Documents

Publication Publication Date Title
EP0498306B1 (en) Method of preparing oxide superconducting material
US5856277A (en) Surface texturing of superconductors by controlled oxygen pressure
KR20050118294A (en) Metal base plate for oxide superconductive wire rod, oxide superconductive wire rod and process for producing the same
JPH05139893A (en) Production of superconductive thin film
JPH0218974A (en) Supeconducting device and its manufacture
JPH0297427A (en) Production of oxide superconducting thin film
JP3096050B2 (en) Method for manufacturing semiconductor device
JP2814563B2 (en) Manufacturing method of oxide superconducting film
US6929695B2 (en) Method for preparing single crystal oxide thin film
WO1992022426A1 (en) A-axis high temperature superconducting films with preferential in-plane alignment
JPH01100096A (en) Production of oxide superconductor thin film
JPH0244029A (en) Production of thin oxide superconducting film
JP2754494B2 (en) Method for producing an oriented layer of Bi-Sr-Ca-Cu-oxide or T1-Ba-Ca-Cu-oxide high temperature superconductor
JP3188912B2 (en) Method for producing oxide superconducting thin film
JPH01119076A (en) Manufacture of oxide superconductive film
JPH04349108A (en) Formation of high temperature superconducting thin film
JPH01115899A (en) Production of oxide superconductor film
JPH03261608A (en) Manufacture of high-temperature superconducting thin film
JPH01167912A (en) Sheathing material of superconducting material and manufacture thereof
JPH01100095A (en) Production of oxide superconductor circuits
JPH03261607A (en) Manufacture of high-temperature superconducting thin film
JPH02196004A (en) Formation of oxide superconducting film
JPH0244024A (en) Production of thin oxide superconducting film
JPH01220876A (en) Wiring of oxide superconductor film
Lathrop et al. In-Situ Production of Superconducting YBa2Cu3O7-y Thin Films by High Pressure Reactive Evaporation with Rapid Thermal Annealing

Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 19990204