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Analytical microscopy of iron-based superconducting materials 铁基超导材料的分析显微镜
Novel Superconducting Materials Pub Date : 2015-11-06 DOI: 10.1515/nsm-2015-0004
S. Speller, T. Mousavi, P. Dudin
{"title":"Analytical microscopy of iron-based superconducting materials","authors":"S. Speller, T. Mousavi, P. Dudin","doi":"10.1515/nsm-2015-0004","DOIUrl":"https://doi.org/10.1515/nsm-2015-0004","url":null,"abstract":"Abstract Inhomogeneity and phase separation in unconventional superconducting materials is a topic of increasing interest, as the competition between phases with different types of ordering is thought to play an important role in the emergence of the high temperature superconducting state. A wide range of experimental techniques are available for investigating the crystallography of these complex materials, however the majority are bulk probes. Here we briefly review some spatially resolved techniques that are being used to investigate phase separation in ironbased superconductors, with a focus on analytic Scanning Electron Microscopy techniques and synchrotron-based Photoelectron Microscopy.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124955227","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
Growth and characterization of R(O,F)BiS2 (R = La, Ce, Pr, Nd) superconducting single crystals R(O,F)BiS2 (R = La, Ce, Pr, Nd)超导单晶的生长与表征
Novel Superconducting Materials Pub Date : 2015-11-01 DOI: 10.1515/nsm-2015-0007
M. Nagao
{"title":"Growth and characterization of R(O,F)BiS2 (R = La, Ce, Pr, Nd) superconducting single crystals","authors":"M. Nagao","doi":"10.1515/nsm-2015-0007","DOIUrl":"https://doi.org/10.1515/nsm-2015-0007","url":null,"abstract":"Abstract R(O,F)BiS2 (R: La, Ce, Pr, Nd) superconducting single crystals with different F concentrations are grown using a CsCl/KCl flux. The obtained 1-2 mm-sized single crystals have a plate-like shape and are cleavable along the ab-plane. The crystal structure is tetragonal of space group P4/nmm (#129). The as-grown single crystals exhibit superconductivity at around 3–5 K. The superconducting transition temperature increases with decreasing the ionic radius of the R element. The superconducting anisotropies of the R(O,F)BiS2 single crystals are estimated to be 30–60 according to the effective mass model, whereas the anisotropies for Ce(O,F)BiS2 single crystals are 13–21. The c-axis transport measurements of a single crystal of Pr(O,F)BiS2 under a magnetic field parallel to the ab-plane reveal a “lock-in” state attributed to the Josephson vortex flow. Furthermore, the Ce(O,F)BiS2 single crystals exhibit a magnetic order at the temperature range of 5–7 K that apparently coexist with superconductivity below approximately 3 K.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131463261","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: 19
Motion of Magnetic Flux Quanta in Type-II Superconductors – Some Open Questions ii型超导体中磁通量量子的运动——一些悬而未决的问题
Novel Superconducting Materials Pub Date : 2015-07-22 DOI: 10.1515/nsm-2015-0003
R. Huebener
{"title":"Motion of Magnetic Flux Quanta in Type-II Superconductors – Some Open Questions","authors":"R. Huebener","doi":"10.1515/nsm-2015-0003","DOIUrl":"https://doi.org/10.1515/nsm-2015-0003","url":null,"abstract":"Abstract The motion of the magnetic flux quanta in the mixed state of a type-II superconductor, due to the Lorentz force of an electric transport current, represents the key mechanism for generating resistive losses. Whereas the most common result is Joule heating of the superconductor, also purely electronic non-equilibrium effects can play a dominant role in the case of effective cooling of the sample. The latter situation can be realized by means of very thin superconducting films (having a large surface/ volume ratio). In this paper we discuss experiments with Nd2−xCexCuOy (NCCO) films performed some time ago, yielding evidence for electronic non-equilibrium effects due to the energy dependence of the quasi-particle density of states in the mixed state of the films. The films were imbedded within super-fluid helium for cooling. The recent advances in the fabrication of epitaxial ultra-thin superconducting films promise to contribute to further clarification of these electronic non-equilibrium effects.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126162910","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
Lifshitz transitions and zero point lattice fluctuations in sulfur hydride showing near room temperature superconductivity 硫化物的Lifshitz跃迁和零点晶格波动显示出接近室温的超导性
Novel Superconducting Materials Pub Date : 2015-07-04 DOI: 10.1515/nsm-2015-0006
A. Bianconi, T. Jarlborg
{"title":"Lifshitz transitions and zero point lattice fluctuations in sulfur hydride showing near room temperature superconductivity","authors":"A. Bianconi, T. Jarlborg","doi":"10.1515/nsm-2015-0006","DOIUrl":"https://doi.org/10.1515/nsm-2015-0006","url":null,"abstract":"Abstract Emerets’s experiments on pressurized sulfur hydride have shown that H3S metal has the highest known superconducting critical temperature Tc = 203 K. The Emerets data show pressure induced changes of the isotope coefficient between 0.25 and 0.5, in disagreement with Eliashberg theory which predicts a nearly constant isotope coefficient.We assign the pressure dependent isotope coefficient to Lifshitz transitions induced by pressure and zero point lattice fluctuations. It is known that pressure could induce changes of the topology of the Fermi surface, called Lifshitz transitions, but were neglected in previous papers on the H3S superconductivity issue. Here we propose thatH3S is a multi-gap superconductor with a first condensate in the BCS regime (located in the large Fermi surface with high Fermi energy) which coexists with second condensates in the BCS-BEC crossover regime (located on the Fermi surface spots with small Fermi energy) near the and Mpoints.We discuss the Bianconi-Perali-Valletta (BPV) superconductivity theory to understand superconductivity in H3S since the BPV theory includes the corrections of the chemical potential due to pairing and the configuration interaction between different condensates, neglected by the Eliashberg theory. These two terms in the BPV theory give the shape resonance in superconducting gaps, similar to Feshbach resonance in ultracold fermionic gases, which is known to amplify the critical temperature. Therefore this work provides some key tools useful in the search for new room temperature superconductors.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114302229","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: 66
Review on origin of the unusual high-Tc superconductivity in Ca1−xRExFe2As2 (RE = La, Ce, Pr, Nd) Ca1−xRExFe2As2 (RE = La, Ce, Pr, Nd)异常高tc超导性的来源综述
Novel Superconducting Materials Pub Date : 2015-02-16 DOI: 10.1515/nsm-2015-0002
W. Zhou, Z. Shi
{"title":"Review on origin of the unusual high-Tc superconductivity in Ca1−xRExFe2As2 (RE = La, Ce, Pr, Nd)","authors":"W. Zhou, Z. Shi","doi":"10.1515/nsm-2015-0002","DOIUrl":"https://doi.org/10.1515/nsm-2015-0002","url":null,"abstract":"Abstract Since the discovery of high temperature superconductivity in iron pnictides in 2008, many iron-based superconductors (IBSs) with various crystal structures have been exploited.Among them, superconductivity with the onset transition temperature Tc up to 49 K has been detected in rare earth element doped CaFe2As2 system (CaRE122). The electron doping induced high Tc values clearly exceed the highest Tcs induced by both hole doping (~ 38 K) and chemical or physical pressure (~ 33 K) in the 122-type iron-based superconductors. The occurrence of high-Tc superconductivity in this unique system is quite strange in terms of the much lower Tc observed in the sister compounds bearing structural and chemical similarities. Though the high–Tc superconductivity in Ca1−xRExFe2As2 is of the non-bulk feature, its superconducting origin served as a most important question has attracted tremendous attentions ever since its discovery. In this review, we summarize the previous experimental results observed in this series of superconductors and list the possible key points that may be related to the understanding of the nature for the strange high-Tc superconductivity.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133463537","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
On the nature of filamentary superconductivity in metal-doped hydrocarbon organic materials 金属掺杂碳氢化合物有机材料中丝状超导性质的研究
Novel Superconducting Materials Pub Date : 2015-01-03 DOI: 10.1515/nsm-2015-0001
D. Hillesheim, K. Gofryk, A. Sefat
{"title":"On the nature of filamentary superconductivity in metal-doped hydrocarbon organic materials","authors":"D. Hillesheim, K. Gofryk, A. Sefat","doi":"10.1515/nsm-2015-0001","DOIUrl":"https://doi.org/10.1515/nsm-2015-0001","url":null,"abstract":"Abstract High temperature superconductivity in K-doped 1,2:8,9-dibenzenopentacene (C30H18) has been recently reported [1] with Tc = 33 K, the highest among organic superconductors at ambient pressure. Here we report on our search for superconductivity in K, Ba, and Ca-doped hydrocarbon organic materials. We find that Ba-anthracene (C14H10) and K-Picene (C22H14) show features characteristics of superconducting state, although very weak. The data suggests that Ba-anthracene might be a new organic superconductor with Tc ~35 K.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124690730","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
Emergent Magnéli-type crystal phases and their mixture in pressurized sulfur hydride 加压氢化硫中涌现的magnsamli型晶相及其混合物
Novel Superconducting Materials Pub Date : 1900-01-01 DOI: 10.1515/nsm-2017-0004
R. Akashi, W. Sano, R. Arita, S. Tsuneyuki
{"title":"Emergent Magnéli-type crystal phases and their mixture in pressurized sulfur hydride","authors":"R. Akashi, W. Sano, R. Arita, S. Tsuneyuki","doi":"10.1515/nsm-2017-0004","DOIUrl":"https://doi.org/10.1515/nsm-2017-0004","url":null,"abstract":"Abstract The pressure-induced superconductivity in sulfur hydride has recently received tremendous amount of interest for its record-breaking transition temperature (Tc) of 203 K. We extensively discuss an infinite sequence of metastable structures of sulfur hydride under high pressure which has been recently proposed theoretically [R. Akashi et al., Phys. Rev. Lett. 117, 075503 (2016)]. The newly found structures are understood as the stacked layers of H2S and H3S, showing close similarity to the Magnéli phases formed in transition-metal oxides. The possible emergence of the “HxS Magnéli” phases are discussed as intermediate metastable phases in the formation of the high-Tc H3S phase. Superconducting transition temperatures and the Xray diffraction patterns are simulated with the first-principles calculations. It is demonstrated that the HxS Magnéli phases could serve as the silver bullet to explain the complicated dependences of the observed Tcs and diffraction patterns on the experimental protocol.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122658325","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: 5
Terahertz studies of superconducting gaps in Co-doped BaFe2As2 pnictide superconductors 共掺杂BaFe2As2镍基超导体中超导间隙的太赫兹研究
Novel Superconducting Materials Pub Date : 1900-01-01 DOI: 10.2478/nsm-2013-0001
P. Dore, B. Joseph, S. Lupi, A. Perucchi
{"title":"Terahertz studies of superconducting gaps in Co-doped BaFe2As2 pnictide superconductors","authors":"P. Dore, B. Joseph, S. Lupi, A. Perucchi","doi":"10.2478/nsm-2013-0001","DOIUrl":"https://doi.org/10.2478/nsm-2013-0001","url":null,"abstract":"Abstract In the present paper we report a summary of the infrared studies on the multi-band Ba(Fe1-xCox)2As2 pnictide system, devoted to the detection of superconducting gaps in the terahertz region. Generally, results obtained in the superconducting state indicate the presence of two gaps, but univocal results have not been obtained so far. We show that all the literature gap values of the Ba(Fe1-xCox)2As2 system, when put together as a function of Tc, show a tendency to cluster along two main curves, thus allowing to describe the seemingly contradictory reports into a unified perspective. Below a temperature around 20 K, the sizes of the two gaps as a function of Tc seem to have a BCS-like linear behavior, but with different slopes. In particular, the Δ/kBTc ratio is compatible with the weak-coupling BCS prediction (1.76) for the large gap, while it is close to 1 for the small gap. For Tc above 20 K, a clear supra-linear behavior is observed for the large gap. Although not so clear, such a tendency is also observable for the small gap.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122124678","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
Control of sputtering parameters for deposition of NbN thick films NbN厚膜沉积溅射参数的控制
Novel Superconducting Materials Pub Date : 1900-01-01 DOI: 10.2478/nsm-2013-0002
R. Jha, V. Awana
{"title":"Control of sputtering parameters for deposition of NbN thick films","authors":"R. Jha, V. Awana","doi":"10.2478/nsm-2013-0002","DOIUrl":"https://doi.org/10.2478/nsm-2013-0002","url":null,"abstract":"Abstract We report a detailed study on control of sputtering parameters for synthesizing NbN superconducting thick films. The NbN films are deposited on single crystalline silicon (100) by DC reactive sputtering, i.e., deposition of Nb in the presence of reactive N2 gas. After several runs, samples were prepared with Ar:N2 partial gas ratios of 90:10, 80:20 and 70:30 for a deposition time of 10 minutes. The fabricated films (400 nm thick) crystallize with a cubic structure, with a small quantity of Nb/NbOx embedded in the main NbN phase. All three samples are characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDAX), to examine their microstructure and elemental compositional distributions, respectively. The roughness was mesured by atomic force microscopy (AFM). The optimized film prepared with Ar:N2 gas ratio of 80:20 has a Tc(R = 0) in zero and 140 kOe fields of 14.8 K and 8.8 K, respectively. The upper critical field Hc2(0) of the studied superconducting films is calculated from magneto-transport [R(T )H] measurements using GL and WHH equations.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133241512","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
Accelerated materials design approaches based on structural classification: application to low enthalpy high pressure phases of SH3 and SeH3 基于结构分类的加速材料设计方法:在SH3和SeH3低焓高压相中的应用
Novel Superconducting Materials Pub Date : 1900-01-01 DOI: 10.1515/nsm-2017-0002
J. A. Flores-Livas, A. Sanna, S. Goedecker
{"title":"Accelerated materials design approaches based on structural classification: application to low enthalpy high pressure phases of SH3 and SeH3","authors":"J. A. Flores-Livas, A. Sanna, S. Goedecker","doi":"10.1515/nsm-2017-0002","DOIUrl":"https://doi.org/10.1515/nsm-2017-0002","url":null,"abstract":"Abstract We propose a methodology that efficiently asseses major characteristics in the energy landscape for a given space of configurations (crystal structures) under pressure. In this work we study SH3 and SeH3 , both of fundamental interest due to their superconducting properties. Starting from the crystal fingerprint, which defines configurational distances between crystalline structures, we introduce an optimal one dimensional metric space that is used to both classify and characterize the structures. Furthermore, this is correlated to the electronic structure. Our analysis highlights the uniqueness of the Im − 3m phase of H3S and H33Se for superconductivity. This approach is an useful tool for future material design applications.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123481853","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
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