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Progress in Superconductivity and Cryogenics最新文献

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Synthesis of the Ni-doped ternary compound Ba(Fe 1-x Ni x ) 2 Se 3 掺镍三元化合物Ba(Fe 1-x Ni x) 2 Se 3的合成
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2015-12-31 DOI: 10.9714/PSAC.2015.17.4.030
H. Park, Soohyeon Shin, Soon-Gil Jung, Do-Yeon Hwang, Hyoyoung Lee, T. Park
{"title":"Synthesis of the Ni-doped ternary compound Ba(Fe 1-x Ni x ) 2 Se 3","authors":"H. Park, Soohyeon Shin, Soon-Gil Jung, Do-Yeon Hwang, Hyoyoung Lee, T. Park","doi":"10.9714/PSAC.2015.17.4.030","DOIUrl":"https://doi.org/10.9714/PSAC.2015.17.4.030","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"17 1","pages":"30-33"},"PeriodicalIF":0.3,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376663","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
Extended Drude model analysis of n-doped cuprate, Pr 0.85 LaCe 0.15 CuO 4 n掺杂铜的扩展Drude模型分析，Pr 0.85 LaCe 0.15 cuo4
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2015-12-31 DOI: 10.9714/PSAC.2015.17.4.016
Seokbae Lee, D. Song, E. Jung, S. Roh, Changyoung Kim, Jenq-Neng Hwang
{"title":"Extended Drude model analysis of n-doped cuprate, Pr 0.85 LaCe 0.15 CuO 4","authors":"Seokbae Lee, D. Song, E. Jung, S. Roh, Changyoung Kim, Jenq-Neng Hwang","doi":"10.9714/PSAC.2015.17.4.016","DOIUrl":"https://doi.org/10.9714/PSAC.2015.17.4.016","url":null,"abstract":"We investigated optical properties of an electron-doped copper oxide high temperature superconductor, Pr0.85LaCe0.15CuO4 (PLCCO) single crystal. We obtained the optical conductivity from measured reflectance at various temperatures. We found our data contained c-axis longitudinal optical (LO) phonon modes due to miscut and intrinsic lattice distortion. We applied an extended Drude model to study the correlations between charge carriers in the system. The LO phonons appear as strong sharp peaks in the optical scattering rate. We tried to remove the LO phonon modes by using the energy loss function, which also shows the LO phonons as peaks, and could not remove them completely. We extracted the electron-boson spectral density function using a generalized Allen's formula. We observed that the resulting electron-boson density show similar temperature dependence as hole-doped cuprates.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"17 1","pages":"16-20"},"PeriodicalIF":0.3,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376649","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
Cool-down test of HWR cryomodule for RAON 用于RAON的HWR低温模块冷却试验
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2015-12-31 DOI: 10.9714/PSAC.2015.17.4.043
Youngkwon Kim, M. K. Lee, Y. W. Jo, J. Choi, Hyobong Kim, W. Kim, Hyungjun Kim
{"title":"Cool-down test of HWR cryomodule for RAON","authors":"Youngkwon Kim, M. K. Lee, Y. W. Jo, J. Choi, Hyobong Kim, W. Kim, Hyungjun Kim","doi":"10.9714/PSAC.2015.17.4.043","DOIUrl":"https://doi.org/10.9714/PSAC.2015.17.4.043","url":null,"abstract":"The heavy ion accelerator that will be built in Daejeon utilizes four types of superconducting cavities. Cryomodules holding the superconducting cavities in them supply thermal insulation for cavities operating in 4.3 K or 2.1 K. A Prototype of cryomodule which holds two HWR (Half Wave Resonator) cavities was fabricated and tested. Since the operating temperature of the HWR is 2.1 K, the superfluid helium was generated with warm vacuum pumping system. The cyromodule was successfully cooled down below lambda point temperature of helium and any detectable leak was not observed during the test. The static thermal load at 4.2 K was measured. The result and the experience for the cool-down below lambda point of helium are reported in this paper.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"17 1","pages":"43-46"},"PeriodicalIF":0.3,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376519","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
Development of Contaminant Detection System using HTS SQUIDs HTS鱿鱼污染物检测系统的研制
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2015-12-31 DOI: 10.9714/PSAC.2015.17.4.038
T. Ohtani, Saburo Tanaka, Y. Narita, S. Ariyoshi, S. Suzuki
{"title":"Development of Contaminant Detection System using HTS SQUIDs","authors":"T. Ohtani, Saburo Tanaka, Y. Narita, S. Ariyoshi, S. Suzuki","doi":"10.9714/PSAC.2015.17.4.038","DOIUrl":"https://doi.org/10.9714/PSAC.2015.17.4.038","url":null,"abstract":"豊橋技術科学大学, ○ 大谷 剛義,内田 陽介, 田中 三郎 Toyohashi Univ. of Technol. , ○T. Otani, Y. Uchida, S. Tanaka E-mail: to013@edu.imc.tut.ac.jp 1.はじめに 食品の製造工程において加工機械の破損等 により金属異物が混入する事故が発生し、社会 問題となっている。既に渦電流式金属検査装置 や X 線異物検査装置が広く普及しているが、 十分な検出感度が得られていないため、高感度 な金属異物検出技術が求められている。我々は これまでに HTS dc-SQUID を用いた磁性金属 異物検査装置の開発を行い、更に Julicher SQUID GmbH 社のHTS rf-SQUID magnetometer を用い異物-センサ間距離(Stand-off) 68mm で鉄球φ0.5mm まで検出可能な、食品向け異物 検査装置の試作開発に成功してきた。 本研究では、20m/分のライン速度を想定し、 食品厚さ 100mm まで検査可能なシステムを試 作。食品高さ≧80mm において、鉄球φ0.5mm を検出可能なシステムを開発することを目的 とした新たに装置を試作し、検出性能評価を行 った。 2.検出原理とシステム 対象となる食品を予め磁気回路を通過させ ることにより、食品内の磁性金属を磁化し、 SQUID センサにより残留磁化の計測を行う。 Fig. 1 にシステムの概略図を示す。 3 個の SQUID(ホワイトノイズレベル 200 fT/ Hz @1kHz)を個別ガラスデュワに入れ、","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"17 1","pages":"38-42"},"PeriodicalIF":0.3,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376514","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
Local structural study of commercial grade MBa 2 Cu 3 O 7-x (M = Y and/or Gd) coated conductors by polarized Raman spectroscopy 用偏振拉曼光谱研究商业级mba2cu3o7 -x (M = Y和/或Gd)涂层导体的局部结构
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2015-12-31 DOI: 10.9714/PSAC.2015.17.4.025
H. Moon, H. Shin, H. Jin, W. Jo, Seokhyun Yoon
{"title":"Local structural study of commercial grade MBa 2 Cu 3 O 7-x (M = Y and/or Gd) coated conductors by polarized Raman spectroscopy","authors":"H. Moon, H. Shin, H. Jin, W. Jo, Seokhyun Yoon","doi":"10.9714/PSAC.2015.17.4.025","DOIUrl":"https://doi.org/10.9714/PSAC.2015.17.4.025","url":null,"abstract":"In 1987, M. K. Wu and Paul Chu discovered Y 1.2 Ba 0.8 CuO 4 (YBCO) with critical temperature (T c ) of 93 K. It has significantly lowered the cost of cooling of a material up to the point where superconductivity set in. Utilizing the cost reduction of attaining superconductivity and the vast amount of research to understand characteristics of high temperature oxide superconducting materials, there has been effort to use a high temperature superconductor as a coated conductor. It is important to characterize the materials precisely for stable performance before commercializing. We used polarized Raman scattering spectroscopy to study structural and stoichiometric information regarding YBa 2 Cu 3 O 7-x , GdYBa 2 Cu 3 O 7-x , and GdBa 2 Cu 3 O 7-x produced by three leading groups of producing commercial grade high temperature superconductor coated conductors American Superconductor Corporation, Superpower, and SuNAM.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"17 1","pages":"25-29"},"PeriodicalIF":0.3,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376658","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
Review : Thermal contact problems at cryogenic temperature 综述:低温下的热接触问题
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2015-12-31 DOI: 10.9714/PSAC.2015.17.4.001
Sangkwon Jeong, Changgi Park
{"title":"Review : Thermal contact problems at cryogenic temperature","authors":"Sangkwon Jeong, Changgi Park","doi":"10.9714/PSAC.2015.17.4.001","DOIUrl":"https://doi.org/10.9714/PSAC.2015.17.4.001","url":null,"abstract":"Abstract This paper addresses technical problems of thermal contact conductance or resistance which inevitably occurs in most cryogenic engineering systems. The main focus of this paper is to examine what kind of physical factors primarily influences the thermal contact resistance and to suggest how it can be minimized. It is a good practical rule that the contact surface must have sub-micron roughness level with no oxide layer and be thinly covered by indium, gold, or Apiezon-N grease for securing sufficient direct contact area. The higher contact pressure, the lower the thermal contact resistance. The general description of this technique has been widely perceived and reasonable engineering results have been achieved in most applications. However, the detailed view of employing these techniques and their relative efficacies to reduce thermal contact resistances need to be thoroughly reviewed. We should consider specific thermal contact conditions, examine the engineering requirements, and execute each method with precautions to fulfil their maximum potentials.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"17 1","pages":"1-7"},"PeriodicalIF":0.3,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376635","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
Measurement of the occipital alpha rhythm and temporal tau rhythm by using magnetoencephalography 用脑磁图测量枕α节律和颞tau节律
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2015-12-31 DOI: 10.9714/PSAC.2015.17.4.034
Jieun Kim, Bakul Gohel, Kiwoong Kim, Hyukchan Kwon, Kyung-min An
{"title":"Measurement of the occipital alpha rhythm and temporal tau rhythm by using magnetoencephalography","authors":"Jieun Kim, Bakul Gohel, Kiwoong Kim, Hyukchan Kwon, Kyung-min An","doi":"10.9714/PSAC.2015.17.4.034","DOIUrl":"https://doi.org/10.9714/PSAC.2015.17.4.034","url":null,"abstract":"Developing Magnetoencephalography (MEG) based on Superconducting Quantum Interference Device (SQUID) facilitates to observe the human brain functions in non-invasively and high temporal and high spatial resolution. By using this MEG, we studied alpha rhythm (8-13 Hz) that is one of the most predominant spontaneous rhythm in human brain. The 8–13 Hz rhythm is observed in several sensory region in the brain. In visual related region of occipital, we call to alpha rhythm, and auditory related region of temporal call to tau rhythm, sensorimotor related region of parietal call to mu rhythm. These rhythms are decreased in task related region and increased in task irrelevant regions. This means that these rhythms play a pivotal role of inhibition in task irrelevant region. It may be helpful to attention to the task. In several literature about the alpha-band inhibition in multi-sensory modality experiment, they observed this effect in the occipital and somatosensory region. In this study, we hypothesized that we can also observe the alpha-band inhibition in the auditory cortex, mediated by the tau rhythm. Before that, we first investigated the existence of the alpha and tau rhythm in occipital and temporal region, respectively. To see these rhythms, we applied the visual and auditory stimulation, in turns, suppressed in task relevant regions, respectively.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"17 1","pages":"34-37"},"PeriodicalIF":0.3,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376666","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
Study on visible emission of Cu-ion-doped perovskite hafnate in view of excitation energy dependence 基于激发能依赖性的cu离子掺杂半酸钙钛矿可见光发射研究
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2015-12-31 DOI: 10.9714/PSAC.2015.17.4.008
D. Lee, Y. Lee, H. Noh
{"title":"Study on visible emission of Cu-ion-doped perovskite hafnate in view of excitation energy dependence","authors":"D. Lee, Y. Lee, H. Noh","doi":"10.9714/PSAC.2015.17.4.008","DOIUrl":"https://doi.org/10.9714/PSAC.2015.17.4.008","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"17 1","pages":"8-11"},"PeriodicalIF":0.3,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376640","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
Superconducting transition in the Presence of Magnetic order in BaFe1.89Co0.11As2 磁序存在下BaFe1.89Co0.11As2的超导转变
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2015-12-31 DOI: 10.9714/PSAC.2015.17.4.021
K. W. Kim, Thomas Wolf, C. Bernhard
{"title":"Superconducting transition in the Presence of Magnetic order in BaFe1.89Co0.11As2","authors":"K. W. Kim, Thomas Wolf, C. Bernhard","doi":"10.9714/PSAC.2015.17.4.021","DOIUrl":"https://doi.org/10.9714/PSAC.2015.17.4.021","url":null,"abstract":"We report optical spectra of underdoped BaFe1.89Co0.11As2 that hosts both of magnetic and superconducting orders. The temperature dependent evolution of optical conductivity shows finger prints of the magnetic order and the s-wave nature of the superconducting gaps. Careful inspection on the superconducting state reveals that the two orders compete but coexist in the ground state.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"17 1","pages":"21-24"},"PeriodicalIF":0.3,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376653","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
Normal-state charge dynamics of ternary platinum germanide superconductor La2Pt3Ge5 三元锗化铂超导体La2Pt3Ge5的正态电荷动力学
IF 0.3
Progress in Superconductivity and Cryogenics Pub Date : 2015-12-31 DOI: 10.9714/PSAC.2015.17.4.012
S. J. Song, N. Sung, B. Cho, S. Moon
{"title":"Normal-state charge dynamics of ternary platinum germanide superconductor La2Pt3Ge5","authors":"S. J. Song, N. Sung, B. Cho, S. Moon","doi":"10.9714/PSAC.2015.17.4.012","DOIUrl":"https://doi.org/10.9714/PSAC.2015.17.4.012","url":null,"abstract":"We report on the infrared spectroscopic studies of the normal-state electronic response of rare-earth ternary platinum germanide superconductor La2Pt3Ge5. We analyzed the temperature-dependent optical conductivity spectra using the Drude-Lorentz oscillator model. We found that the two Drude responses with distinct scattering rates are required to explain the charge dynamics at 10 K while a single Drude mode could reproduce the far-infrared conductivity at higher temperatures. Our results indicated the two-band character of the electronic structure and highlighted the disparate temperature evolution of the electrodynamics of the two electronic states.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"17 1","pages":"12-15"},"PeriodicalIF":0.3,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376644","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
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