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Progress in Superconductivity and Cryogenics最新文献

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Ultrafast probes of coherent oscillations in Fe-based superconductors 铁基超导体相干振荡的超快探针
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2017-03-31 DOI: 10.9714/psac.2017.19.1.001
K. W. Kim
{"title":"Ultrafast probes of coherent oscillations in Fe-based superconductors","authors":"K. W. Kim","doi":"10.9714/psac.2017.19.1.001","DOIUrl":"https://doi.org/10.9714/psac.2017.19.1.001","url":null,"abstract":"Forefront ultrafast experimental techniques have recently proven their potential as new approaches to understand materials based on non-equilibrium dynamics in the time domain. The time domain approach is useful especially in disentangling complicated coupling among charge, spin and lattice degrees of freedom. Various ultrafast experiments on Fe-based superconductors have observed strong coherent oscillations of an A 1g phonon mode of arsenic ions, which shows strong coupling to the electronic and magnetic states. This paper reviews the recent reports of ultrafast studies on Fe-based superconductor with a focus on the coherent oscillations. Experimental results with ultrashort light sources from the terahertz-infrared pulses to the hard X-rays from a free electron laser will be presented.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"1-4"},"PeriodicalIF":0.3,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43800451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Orientation and thickness dependence of magnetic levitation force and trapped magnetic field of single grain YBa2Cu3O7-y bulk superconductors 单晶粒YBa2Cu3O7-y体超导体悬浮力和俘获磁场的取向和厚度依赖性
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2017-03-31 DOI: 10.9714/PSAC.2017.19.1.030
Y. Jung, S. Go, H. Joo, Y. J. Lee, S.-D. Park, B. Jun, C. Kim
{"title":"Orientation and thickness dependence of magnetic levitation force and trapped magnetic field of single grain YBa2Cu3O7-y bulk superconductors","authors":"Y. Jung, S. Go, H. Joo, Y. J. Lee, S.-D. Park, B. Jun, C. Kim","doi":"10.9714/PSAC.2017.19.1.030","DOIUrl":"https://doi.org/10.9714/PSAC.2017.19.1.030","url":null,"abstract":"2017) Abstract The effects of the crystallographic orientation and sample thickness on the magnetic levitation forces ( F ) and trapped magnetic field ( B ) of single grain YBCO bulk superconductors were examined. Single grain YBCO samples with a (001), (110) or (100) surface were used as the test samples. The samples used for the force-distance ( F-d ) measurement were cooled at 77 K without a magnetic field (zero field cooling, ZFC), whereas the samples used for the B measurement were cooled under the external magnetic field of a Nd-B-Fe permanent magnet (field cooling, FC). It was found that F and B of the (001) surface were higher than those of the (110) or (100) surface, which is attributed to the higher critical current density ( J c ) of the (001) surface. For the (001) samples with t =5 – 18 mm, the maximum magnetic levitation forces ( F max s) of the ZFC samples were larger than 40 N. About 80% of the applied magnetic field was trapped in the FC samples. However, the F and B decreased rapidly as t decreased below 5 mm. There exists a critical sample thickness ( t =5 mm for the experimental condition of this study) for maintaining the large levitation/trapping properties, which is dependent on the material properties and magnitude of the external magnetic","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"30-35"},"PeriodicalIF":0.3,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43806930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Effects of heat treatment temperature on the formation of MgB 2 bulk superconductors prepared using MgB 4 and Mg powder 热处理温度对用MgB4和Mg粉末制备的MgB2块体超导体形成的影响
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2017-03-31 DOI: 10.9714/PSAC.2017.19.1.042
Sang-Hyun Kim, W. Kang, Y. J. Lee, B. Jun, C. Kim
{"title":"Effects of heat treatment temperature on the formation of MgB 2 bulk superconductors prepared using MgB 4 and Mg powder","authors":"Sang-Hyun Kim, W. Kang, Y. J. Lee, B. Jun, C. Kim","doi":"10.9714/PSAC.2017.19.1.042","DOIUrl":"https://doi.org/10.9714/PSAC.2017.19.1.042","url":null,"abstract":"2017) Abstract The effects of the heat treatment temperature (600 ℃ -1050 ℃ ) on the formation of MgB 2 and the superconducting properties have been examined. The self-synthesized MgB 4 and commercial Mg powders were used as raw materials for the formation of MgB 2 . The superconducting critical temperatures ( T c s) of MgB 2 bulk superconductors prepared at 600 ℃ -850 ℃ were as high as 37-38 K regardless of the heat treatment temperature. However, because MgB 4 is more stable than MgB 2 at above 850 ℃ , no superconducting signals were detected in the susceptibility-temperature curves of the samples prepared above 850 ℃ . As for the critical current density ( J c ), the sample heat-treated at a low temperature (600 ℃ ) for a prolonged period (40 h) showed a J c higher than those prepared at 650 ℃ -850 ℃ for a short period (1 h). The FWHM (full width at half maximum) result showed that the grain size of MgB 2 of the 600 ℃ sample was smaller than that of the other samples. The high J c of the 600 ℃ sample is attributed to the presence of large numbers of grain boundaries, which can act as flux pinning centers of MgB 2","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"42-46"},"PeriodicalIF":0.3,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43201912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Field gradient calculation of HTS double-pancake coils considering the slanted turns and the splice 考虑倾斜匝数和拼接的高温超导双扁线圈的场梯度计算
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2017-03-31 DOI: 10.9714/PSAC.2017.19.1.051
Geonwoo Baek, Jinsub Kim, W. Lee, Seunghyun Song, Onyou Lee, Hyoungku Kang, T. Ko
{"title":"Field gradient calculation of HTS double-pancake coils considering the slanted turns and the splice","authors":"Geonwoo Baek, Jinsub Kim, W. Lee, Seunghyun Song, Onyou Lee, Hyoungku Kang, T. Ko","doi":"10.9714/PSAC.2017.19.1.051","DOIUrl":"https://doi.org/10.9714/PSAC.2017.19.1.051","url":null,"abstract":"2017) Abstract To obtain Nuclear Magnetic Resonance (NMR) measurement of membrane protein, an NMR magnet is required to generate high intensity, homogeneity, and stability of field. A High-Temperature Superconducting (HTS) magnet is a promising alternative to a conventional Low-Temperature Superconducting (LTS) NMR magnet for high field, current density, and stability margin. Conventionally, an HTS coil has been wound by several winding techniques such as Single-Pancake (SP), Double-Pancake (DP), and layer-wound. The DP winding technique has been frequently used for a large magnet because long HTS wire is generally difficult to manufacture, and maintenance of magnet is convenient. However, magnetic field generated by the slanted turns and the splice leads to field inhomogeneity in Diameter of Spherical Volume (DSV). The field inhomogeneity degrades performance of NMR spectrometer and thus effect of the slanted turns and the splice should be analyzed. In this paper, field gradient of HTS double-pancake coils considering the slanted turns and the splice was calculated using Biot-Savart law and numerical integration. The calculation results showed that magnetic field produced by the slanted turns and the splice caused significant inhomogeneity of","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"51-55"},"PeriodicalIF":0.3,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45235317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Enrichment of valuable elements from vanadium slag using superconducting HGMS technology 利用超导HGMS技术从钒渣中富集有价元素
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2017-03-31 DOI: 10.9714/PSAC.2017.19.1.017
S. He, Changqiao Yang, Suqin Li, Changquan Zhang
{"title":"Enrichment of valuable elements from vanadium slag using superconducting HGMS technology","authors":"S. He, Changqiao Yang, Suqin Li, Changquan Zhang","doi":"10.9714/PSAC.2017.19.1.017","DOIUrl":"https://doi.org/10.9714/PSAC.2017.19.1.017","url":null,"abstract":"Vanadium slags is a kind of vanadiferous solid waste from steelmaking process. It not only occupies land, pollutes environment, but also leads to waste of resources. Based on the difference of magnetic susceptibility of different particles caused by their chemical and physical properties from vanadium slag, a new technology, superconducting high gradient magnetic separation was investigated for separation and extraction of valuable substances from vanadium slag. The magnetic concentrate was obtained under optimal parameters, i.e., a particle size -200 mesh, a magnetic flux density of 0.8 T, a slurry concentration of 5 g/L, an amount of steel wools of 25 g and a slurry flow velocity of 2 L/min. The content of Fe2O3 in concentrate could be increased from 39.6% to 55.0% and V2O5 from 2.5% to 4.0%, respectively. The recovery rate is up to 42.9%, and the vanadium slag has been effectively reused.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"17-21"},"PeriodicalIF":0.3,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44946199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Effect of double pinning mechanism in BSO-added GdBa 2 Cu 3 O 7-x thin films 双钉钉机制对添加bso的gdba2cu3o7 -x薄膜的影响
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2017-01-01 DOI: 10.9714/psac.2017.19.3.013
J. Oh, H. Jeon, J. M. Lee, W. Kang, B. Kang
{"title":"Effect of double pinning mechanism in BSO-added GdBa 2 Cu 3 O 7-x thin films","authors":"J. Oh, H. Jeon, J. M. Lee, W. Kang, B. Kang","doi":"10.9714/psac.2017.19.3.013","DOIUrl":"https://doi.org/10.9714/psac.2017.19.3.013","url":null,"abstract":"We investigated the effect of self-assembled BSO nano-defects as pinning centers in BSO-added GdBCO films when the thicknesses of films were varied. 3.5 vol. % BSO-added GdBCO films with varying thicknesses from 200 nm to 1000 nm were deposited on SrTiO 3 (STO) substrate by using pulsed laser deposition (PLD) process. For the films with thicknesses of 400 nm and 600 nm, ‘anomaly shoulders’ in J c - H characteristic curves were observed near the matching field. The anomaly shoulders appeared in the field dependence of J c may be attributed to the existence of double pinning mechanisms in thin films. The fit to the pinning force density as a function of reduced field h (H/H irr ) using the Dew-Hughes’ scaling law shows that both the 400 nm- and the 600 nm-thick films have double pinning mechanisms while the other films have a single pinning mechanism. These results indicate that the self-assembled property of BSO result in different role as pinning centers with different thickness.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"13-17"},"PeriodicalIF":0.3,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Characterization of electromechanical properties of Sn-Cu double layer stabilized GdBCO coated conductor tapes at 77 K 77 K下Sn-Cu双层稳定GdBCO涂层导体带机电性能表征
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2017-01-01 DOI: 10.9714/PSAC.2017.19.4.026
Shin Hyung Seop, Mark Angelo Diaz, Jae-Hun Lee
{"title":"Characterization of electromechanical properties of Sn-Cu double layer stabilized GdBCO coated conductor tapes at 77 K","authors":"Shin Hyung Seop, Mark Angelo Diaz, Jae-Hun Lee","doi":"10.9714/PSAC.2017.19.4.026","DOIUrl":"https://doi.org/10.9714/PSAC.2017.19.4.026","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"26-30"},"PeriodicalIF":0.3,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Interior seeding combined with top seeding for the fabrication of single grain REBCO bulk superconductors 内播种与顶播种相结合制备单粒REBCO块状超导体
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2017-01-01 DOI: 10.9714/PSAC.2017.19.2.014
H. Lee
{"title":"Interior seeding combined with top seeding for the fabrication of single grain REBCO bulk superconductors","authors":"H. Lee","doi":"10.9714/PSAC.2017.19.2.014","DOIUrl":"https://doi.org/10.9714/PSAC.2017.19.2.014","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"14-18"},"PeriodicalIF":0.3,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of seed orientation on the growth behavior of single grain REBCO bulk superconductors 种子取向对单粒REBCO块体超导体生长行为的影响
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2017-01-01 DOI: 10.9714/psac.2017.19.2.009
H. Lee
{"title":"Effects of seed orientation on the growth behavior of single grain REBCO bulk superconductors","authors":"H. Lee","doi":"10.9714/psac.2017.19.2.009","DOIUrl":"https://doi.org/10.9714/psac.2017.19.2.009","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"9-13"},"PeriodicalIF":0.3,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of seed geometry on the crystal growth and the magnetic properties of single grain REBCO bulk superconductors 种子几何形状对单粒REBCO块体超导体晶体生长和磁性能的影响
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2017-01-01 DOI: 10.9714/PSAC.2017.19.3.033
Hwi-Joo Lee, Park Soondong, B. Jun, Chan-Joon Kim, H. Lee
{"title":"Effects of seed geometry on the crystal growth and the magnetic properties of single grain REBCO bulk superconductors","authors":"Hwi-Joo Lee, Park Soondong, B. Jun, Chan-Joon Kim, H. Lee","doi":"10.9714/PSAC.2017.19.3.033","DOIUrl":"https://doi.org/10.9714/PSAC.2017.19.3.033","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"33-39"},"PeriodicalIF":0.3,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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