Abstract:
A method includes: providing a first wafer including a first substrate, a first insulator layer on the first substrate, and a first dielectric layer on the first insulator layer; providing a second wafer including a second substrate, a second insulator layer on the second substrate, and a second dielectric layer on the second insulator layer; forming a first superconductor layer on the first dielectric layer; forming a second superconductor layer on the second dielectric layer; joining a surface of the first superconductor layer to a surface of the second superconductor layer to form a wafer stack; and forming a third superconductor layer on exposed first surface of the first dielectric layer.
Abstract:
A composite medium may be artificially structured to enhance electron-phonon coupling in the composite medium, whereby to enhance a Cooper pairing instability in the composite medium. This yields a composite superconductor with superconducting properties (energy gap, critical temperature, etc.) more robust than the superconducting properties of the constituent media. The electron-phonon coupling may be enhanced by increasing the phononic density of states in the composite medium, by introducing hyperbolic phononic dispersion, phononic van Hove singularities, and/or reduced phonon group velocities.
Abstract:
Some embodiments are directed to a device including multiple substrates comprising one or more troughs. The substrates are disposed such that the one or more troughs form at least one enclosure. At least one superconducting layer covers at least a portion of the at least one enclosure. Other embodiments are directed to a method for manufacturing a superconducting device. The method includes acts of forming at least one trough in at least a first substrate; covering at least a portion of the first substrate with a superconducting material; covering at least a portion of a second substrate with the superconducting material; and bonding the first substrate and the second substrate to form at least one enclosure comprising the at least one trough and the superconducting material.
Abstract:
2가닥의 고온 초전도체의 안정화층들을 화학적 습식 에칭 또는 플라즈마 건식 에칭 등을 통하여 제거한 후, 2개의 고온 초전도체층 표면끼리 직접 접촉하고, 이를 진공 상태에서 열처리로 내에서 가열하여 고온 초전도체층 표면을 부분 미세 용융시켜 원자들을 상호 확산시킴으로써 2개의 초전도체층 표면을 접합하는 2세대 ReBCO 고온 초전도체의 접합 방법에 대하여 개시한다.
Abstract:
The present invention provides a method for joining tube superconductor tubes, which are formed of (Bi, Pb) -2223 oxide superconductors. The (Bi, Pb) -2223 oxide superconductors of the superconducting tubes, which are oppositely joined to each other, are clubbed together on a common bush. A method of joining oxide superconducting tubes formed from cold isostatic pressing, which comprises a step of preparing oxide superconducting tubes having end faces to be joined, a step of polishing inner/outer surfaces of both end portions and both end faces of these tubes for exposing a fresh surface, a step of applying superconducting paste on the said polished end faces/inner surfaces, a step of clubbing these tubes together on a common bush, a step of close pressing the said coated end faces together, a step of coating the joined end portions with the superconducting paste to form a joint, a step of wrapping the said coated end portions with a perforated silver sheet followed by a step of sintering the joint portion and the tubes in air for 100 to 150 hours and at temperatures in the range from 830° C to 850°C. According to the invention, the superconducting paste is obtained by mixing (Bi, Pb) -2223 powder in lignin powder and boiled organic linseed oil. In the joint obtained according to this method, it is possible to stably carry more than 91% of the transport current of the high temperature superconducting tubes. A method of joining together oxide superconductors whereby, when joining the oxide superconductors by use of a bush made of an oxide superconducting material, the modified superconducting paste is applied in a region inner surface/outer surface, where a transmission path of electric current flowing between oxide superconductors component tubes as joined together is not obstructed by rendering at least portions of butting surfaces/tube -bush interface of the oxide superconducting tubes to be joined together into polished end faces/surfaces, thereby improving the superconductivity of the joined superconductors.
Abstract:
The present invention relates to a welding method for a second generation high temperature superconducting wire including a substrate, a buffer layer, a superconductor layer, and a stabilizing material layer, wherein parts of the stabilizing material layers contained in two strands of the second generation high temperature superconducting wire are removed, the superconductor layers of two strands of the second generation high temperature superconducting wire exposed by the removal of the stabilizing material layer abut each other and are heated to the melting point of the superconductor layer to melt-diffuse the abutting superconductor layers and weld two strands of the second generation high temperature superconducting wire together. Subsequently, the welded portion is oxygenation-annealed under an oxygen atmosphere to recover superconducting properties of the second high temperature superconducting wire. The above-described configuration of the present invention enables superconductor layers to directly abut each other and to be melt-diffused without using a mediator, thus producing a wire having a full length with a rare junction resistance as compared to a normal conduction junction method. Specifically, the present invention brings a partial oxygen pressure to a nearly vacuum state to lower the melting point, thereby enabling junction processes to be performed without melting a stabilizing material layer containing silver (Ag).
Abstract:
The present invention relates to a welding method for a second generation high temperature superconducting wire including a substrate, a buffer layer, a superconductor layer, and a stabilizing material layer, wherein parts of the stabilizing material layers contained in two strands of the second generation high temperature superconducting wire are removed, the superconductor layers of two strands of the second generation high temperature superconducting wire exposed by the removal of the stabilizing material layer abut each other and are heated to the melting point of the superconductor layer to melt-diffuse the abutting superconductor layers and weld two strands of the second generation high temperature superconducting wire together. Subsequently, the welded portion is oxygenation-annealed under an oxygen atmosphere to recover superconducting properties of the second high temperature superconducting wire. The above-described configuration of the present invention enables superconductor layers to directly abut each other and to be melt-diffused without using a mediator, thus producing a wire having a full length with a rare junction resistance as compared to a normal conduction junction method. Specifically, the present invention brings a partial oxygen pressure to a nearly vacuum state to lower the melting point, thereby enabling junction processes to be performed without melting a stabilizing material layer containing silver (Ag).
Abstract:
Cryogenic refrigeration employs a pulse tube cryo-cooler and a dilution refrigerator to provide very low temperature cooling, for example, to cool superconducting processors. Continuous cryogenic cycle refrigeration may be achieved using multiple adsorption pumps. Various improvements may include multiple distinct thermal-linking points, evaporation pots with cooling structures, and/or one or more gas-gap heat switches which may be integral to an adsorption pump. A reservoir volume may provide pressure relief when the system is warmed above cryogenic temperature, reducing the mass of the system. Additional heat exchangers and/or separate paths for condensation and evaporation may be provided. Multi-channel connectors may be used, and/or connectors formed of a regenerative material with a high specific heat capacity at cryogenic temperature. Flexible PCBs may provide thermal links to components that embody temperature gradients. Various components may be pre-cooled, for example via a switchable thermalization system.
Abstract:
According to an embodiment, a portable system for joining two superconductor pieces comprises a support arranged for holding the two superconductor pieces adjacent to each other in a reaction area, a distribution head positioned to deposit at least one material onto the reaction area used in joining the two superconductor pieces, an ion gun positioned to bombard the reaction area with ions, a gas port arranged for providing at least one gas to the system, and a vacuum port arranged for establishing a desired atmospheric pressure in the system.