High-tc superconductors based on feas compounds pdf

Jul 31, 2017 unlike the widely studied refeaso series, the newly discovered iron based superconductor thfeasn exhibits a remarkably high critical temperature of 30 k, without chemical doping or external pressure. High tc superconductor materials a volume in european materials research society symposia proceedings. Pdf hightc superconductivity in iron based pinictides and. The tetragonal to orthorhombic structural phase transition in multiband feasbased superconductors alessandro ricci, michela fratini and antonio bianconi department of physics, sapienza university of rome, p. Synthesis and characterization of hightc superconductors introduction a. Some found in 2008 to be hightemperature superconductors up to 55 k of. Magnetic and superconducting properties of feasbased hightc superconductors with gd article pdf available in jetp letters 905. Abstracthere the authors report that by a high pressure synthesis method, superconductivity with an onset transition temperature at 52 k was discovered in a fluorinedoped quaternary ironarsenide compound pro1xfx feas, with the zero resistivity and meissner transition appeared at 44 k and 50 k respectively. Physical properties and models of electronic structure are analyzed for a new class of hightc superconductors which belong to ironbased layered compounds. The highest tc of all iron based superconductors was found in the 1111 compound tc58k. They offer transition temperatures as high as 55 k as well as essentially isotropic, and extremely large, upper, superconducting critical fields, in excess of 40 t at 20 k. Superconductivity by joe khachan and stephen bosi the discovery of superconductors the phenomenon of superconductivity, in which the electrical resistance of certain materials completely vanishes at low temperatures, is one of the most interesting and sophisticated in condensed matter physics. It has also been found that some iron chalcogens superconduct. A broad introduction to high tc superconductors, their parent compounds and related novel materials, covering both fundamental questions of modern solid state physics such as correlation effects, fluctuations, unconventional symmetry of superconducting order parameter and applied problems.

The crystal structure of these compounds has much in common with the previously discussed ones, where the feas layers were an important element. By synthesis of ba1xkxfe2as2 superconductivity was observed with a critical temperature tc38k. The bcs theory bardeen, cooper, and schrieffer, 1957 17 was based. Bscco is a cuprate superconductor based on bismuth and strontium. Hightc superconductors based on feas compounds yuri. Ironbased superconductors fesc are ironcontaining chemical compounds whose superconducting properties were discovered in 2006. High t c superconductivity in undoped thfeasn nature. Reofeas 1111 oxypnictide superconductors several high tc superconductors have been discovered also in other fe based analogues compounds including ternary compound afe2as2 a is an alkali earth metal element such as sr and ba. In chemistry, oxypnictides are a class of materials composed of oxygen, a pnictogen and one or more other elements. In 2008, led by recently discovered iron pnictide compounds originally known as oxypnictides, they were in the first stages of experimentation and implementation.

Laoffeas, similar to that of the hightc cuprates, based on the temperaturedependent laser photoemission spectroscopy pes. Febased superconductors have attracted research interest because of their rich structural variety, which is due to their layered crystal structures. Some of the compounds have been known since 1995, and their semiconductive properties have been known and patented since 2006. In the cuprates there are bands of carriers associated with cuo 2 planes as well as a second layer type e. Hightc superconductors based on feas compounds book. In 2008 a new class of high transition temperature hightc superconducting materials based on iron fe and a pnictide e. They feature layers of iron and a pnictide, such as arsenic or phosphorus. Request pdf on jan 1, 2010, yuri izyumov and others published hightc superconductors based on feas compounds find, read and cite all the research you need on researchgate. As well as copperbased hightemperature superconductors htsc, these compounds have a layered structure. However, the actual use of superconducting devices is limited by the fact that they must be cooled to low temperatures to become superconducting. Depending on the strength of the applied magnetic field, applications of hts may be divided in two groups. Iron based superconductors have a high superconducting. Superconductivity at 43 k in an ironbased layered compound.

Physics of ironbased high temperature superconductors. General theory of high t c superconductors 1 wileyvch. However, due to transit disruptions in some geographies, deliveries may be delayed. A bridge between mgb2 and cuprates, journal of superconductivity and novel magnetism. Also called ferropnictides, ironbased superconductors ibscs are ironcontaining compounds that are relative newcomers to the high tc family. Ironbased high transition temperature superconductors national. The ac losses in hightc superconductors can be described by the bean critical state model as long as the exponent n. As well as copper based hightemperature superconductors htsc, these compounds have a layered structure. Physics of ironbased high t c superconductors, conventional. This, the first volume on an emerging topic in materials science, examines in depth the physical properties and models of a new class of hightc superconductors which belong to. Most high t c ceramics are layered structures, with twodimensional copperoxygen sheets along which superconduction takes place.

Physical properties and models of electronic structure are analyzed for a new class of high tc superconductors which belong to iron based layered compounds. The structures are delineated for compounds including tl2ba2cu1o6, tl2ca1ba2cu2o8, and tl2ca2ba2cu3o10. The tetragonal to orthorhombic structural phase transition in. Not to be confused with roomtemperature superconductor. Oct 26, 2010 a new family of superconductors on the basis of fe has been found in fese, fete compounds, whose t c increased under chemical doping andor external pressure 16,304307. Hightc superconductors based on feas compounds springer. Development of conductor based on htsc powderintube technology pit. Pinning force data, fp, of a variety of fe based high tc superconductors 11, 111, 122 and 1111type were analyzed by means of a scaling approach based on own experimental data and an extensive. Hightc superconductors and related materials material. Lts stands for low temperature superconductor, which typically refers to the nbbased alloy most commonly nb47wt. Although this group of compounds has been recognized since 1995, interest in these compounds increased dramatically after the publication of the superconducting properties of laofep and laofeas which. Correlation properties and band structure of feasbased.

A sample of bscco, which currently is one of the most practical hightemperature superconductors. Properties and applications leibnizinstitut for solid state and materials research dresden ruben huhne ifw dresden institute for metallic materials superconducting materials group 2 outline high temperature superconductors htsc which materials. Unlike most classic superconductors, which are based on pure metals, these new superconductors are metal oxides with a layered perovskite structure. An increased tc up of 56 k was reported in smo1xfxfeas 7. Fese is the simplest ironbased superconductor but with the diverse properties.

Hightemperature superconductivity in ironbased materials arxiv. This temperature, called the transition temperature, varies for different materials but generally is below 20 k. The label hightc may be reserved by some authors for those with critical temperature greater than the boiling point of liquid nitrogen 77ak or a196aac. Synthesis and characterization of iron arsenic feas based. Apr 23, 2008 with the exception of the copper based high tc superconductors, this is the highest tc reported to date. Their discovery in 2008 came as a surprise to many, because iron was seen as incompatible with superconductivity. Model the minimal electron model for feasbased htsc follows from the crystal structure of these compounds 1 and band structure calculations, that show that the largest contribution to the electronic density of states near the fermi level.

Fe based superconductors have attracted research interest because of their rich structural variety, which is due to their layered crystal structures. This is the temperature below which a substance is superconducting. Also called ferropnictides, iron based superconductors ibscs are ironcontaining compounds that are relative newcomers to the high tc family. As the first noncuprate compound that superconducts above.

Hightc superconductors based on feas compounds pdf free. Fermi surfaces contain sheets with both electronlike and holelike character in the doped feasbased superconductors 20 and in the transuranic superconductor pucoga 5 21. You will find here a great number of research on actual applications of hts as well as possible future applications of hts. The febased and the cubased superconductors have a common feature in that superconductivity is attained by providing itinerant electron or hole carriers to the twodimensional transport layers containing 3d transitionmetal elements. In addition, they may well provide insight into exotic superconductivity that extends beyond. Twenty years after the discovery of high temperature superconductors, practical. The result shows that the energy levels of 5 p orbitals of all cation. Hightc superconductors based on feas compounds core. Physics of iron based high temperature superconductors yuji matsuda department of physics, kyoto university, kyoto 6068502, japan abstract the discovery of high tc iron pnictide and chalcogenide superconductors has been one of the most exciting recent developments in condensed matter physics. The highest tc in bulk ironbased superconductors is 55 k in. Quaternary borocarbides, superconductors and hg based high tc superconductors studies of high temperature superconductors, no 26 vol 26 anant narlikar on. The properties of these high t c compounds are different in some respects from those of the types of superconductors known prior to 1986, which will be referred to as classic superconductors read more. This definition encompasses a wider variety of unconventional superconductors and is used in the context of theoretical models.

Hightc superconductors based on feas compounds ebook. First book on the new class of hightc superconductors based on feas. A new family of superconductors on the basis of fe has been found in fese, fete compounds, whose t c increased under chemical doping andor external pressure 16,304307. The relation in electronic structure between arsenic atom and its nearest neighbor cation a for various feas superconductor systems is studied. The recently discovered feasbased superconductors are a new, promising set of materials for technological and basic research. Practical applications of superconductivity are steadily improving every year. Entanglement supports very high tc superconductivity 021110 physicists discover how to entangle at high temperatures. Superconductivity at 52 k in iron based f doped layered. Physics of ironbased high temperature superconductors yuji matsuda department of physics, kyoto university, kyoto 6068502, japan abstract the discovery of hightc iron pnictide and chalcogenide superconductors has been one of the mostexciting recent developments in condensed matter physics. View enhanced pdf access article on wiley online library html view download pdf for offline viewing. Superconductivity, complete disappearance of electrical resistance in various solids when they are cooled below a characteristic temperature. The origin of hightemperature superconductivity is still not clear, but it seems that instead of electron phonon attraction mechanisms, as in conventional superconductivity, one is dealing with genuine electronic. Despite their variable chemical composition and differences in the crystal structure, these compounds possess similar physical.

We report superconductivity in an ironbased layered oxypnictide laofep. The a15 type compounds crystallize in the cubic system, as shown in figure. This book is a collection of the chapters intended to study only practical applications of hts materials. However, they differ distinctly from each other in. One of the most appropriate model for these compounds is the twoorbital model 9, 10 which is a typical. The synthesis and properties of lifeas, a hightc febased superconducting stoichiometric compound, are reported. Lowhigh temperature superconductivity center of excellence. With the exception of the copperbased hightc superconductors, this is the highest tc reported to date. Select effects of substitution of copper by iron and cation distribution in the bicasrcuo superconducting compounds. The fe based and the cu based superconductors have a common feature in that superconductivity is attained by providing itinerant electron or hole carriers to the twodimensional transport layers containing 3d transitionmetal elements.

The tetragonal to orthorhombic structural phase transition. Magnetic and electrical resistivity measurements verify the occurrence of the superconducting transition at. Power applications of htsc what are possible applications. Applications of hightc superconductivity intechopen. Special safety precautions are needed for the handling of the volatile and highly toxic hg and tl compounds. Bishop, superconductivity in fe and as based compounds. Hightc superconductors based on feas compounds request pdf. Photograph your local culture, help wikipedia and win. Iron pnictide oxides of the rare earth elements, such as lafeaso 1. Superconductors differ fundamentally in quantum physics behavior. Correlation properties and band structure of feasbased superconductors vladimir kashurnikov, andrey krasavin.

Physical properties and models of electronic structure are analyzed for a new class of hightc superconductors which belong to iron based layered compounds. The tetragonal to orthorhombic structural phase transition in multiband feas based superconductors alessandro ricci, michela fratini and antonio bianconi department of physics, sapienza university of rome, p. A muchneeded update on complex hightemperature superconductors, focusing on materials aspects. Magnetic and superconducting properties of feasbased high. Unlike the widely studied refeaso series, the newly discovered ironbased superconductor thfeasn exhibits a remarkably high critical temperature of. Hightc superconductors based on feas compounds yuri izyumov, ernst kurmaev auth. Superconductivity at 43 k in an iron based layered compound lao 1x f x feas. Superconductors ceramic conductors are the socalled high t c superconductors, materials that lose their resistance at much higher critical temperatures than their metal alloy counterparts. Hightc superconductors based on feas compounds springer series in materials science izyumov, yuri, kurmaev, ernst on. Synthesis and characterization of iron arsenic feas. Newest article in european physical journal b as pdf file 2. Fep or feas layers, where fe atoms form a planar square lattice, and.

The superconductor with the highest transition temperature is the cuprate of mercury, barium, and calcium, at around 3 k. It is these differences that give rise to the unique properties and performance benefits that. By synthesis of ba1xkxfe2as2 superconductivity was observed with a critical temperature tc 38k. Overview of possible applications of high tc superconductors. Hightc superconductivity related to deep inner orbital. Here we report the newstructuretype fe based superconductors caafe4as4 a k, rb, cs and srafe4as4 a rb, cs, which can be regarded as hybrid phases between aefe2as2 ae ca, sr and afe2as2. Because the 122type m 2asfe 2 such as kfe 2as 2 is heavily hole doped 9, both families of hybrid materials are hole doped by itself, making them stoichiometric superconductors without extra carrier doping 2, 5, 7, 10. Here we report the newstructuretype febased superconductors caafe4as4 a k, rb, cs and srafe4as4 a rb, cs, which can be regarded as hybrid phases between aefe2as2 ae ca, sr and afe2as2.

Effect of pressure on the selfholedoped superconductor. The simplest feasbased superconductor in structure is the afeas a. Ernst kurmaev physical properties and models of electronic structure are analyzed for a new class of hightc superconductors which belong to ironbased layered compounds. Previously most hightemperature superconductors were cuprates and being based on layers of. Band structure of feasbased superconductors sciencedirect. Hightc superconductors based on feas compounds springer series in materials science.