Coexistence of superconductivity and antiferromagnetism in. Here we report on coexistence of both cooperative ordered states in recently discovered stoichiometric and fully inversion symmetric heavy fermion compound ce 3 pdin 11 at ambient pressure. We report here that in urhge a magnetic transition can be induced by applying a much larger magnetic field than that at which superconductivity is first destroyed and that at low temperature a new pocket of superconductivity emerges surrounding this transition. Coexistence of antiferromagnetism and superconductivity in heavy fermion cerium compound ce 3. Thus bulk super conductivity with a high value of tc5108 k and a static af ordering at tn560 k are realized in the alternating af and sc layers. Coexistence of antiferromagnetism and lattice distortion. This is, like ferromagnetism and ferrimagnetism, a manifestation of ordered magnetism generally, antiferromagnetic order. Model system hamiltonian in order to study the coexistence of antiferromagnetism and superconductivity in superconducting smaso1. Antiferromagnetic order coexisting with superconductivity in. Antiferromagnet ferrimagnetic ordering daiphys 342555 spring 2012 chapter 121. In addition to the generators of the usual charge so2 and spin so3 symmetries, new poperators are introduced, which rotate superconductivity and antiferro magnetism into each other. Doping dependence of the pinning efficiency in kdoped. Lan zhang, 1, hant ao lu, 1, and hong gang luo 1, 2.
Pdf competition andor coexistence of antiferromagnetism. Pdf coexistence of superconductivity and antiferromagnetism. A property possessed by some metals, alloys, and salts of transition elements in which the atomic magnetic moments, at sufficiently low temperatures, form an ordered array which alternates or spirals so as to give. May 10, 2016 coexistence of superconductivity and magnetism have always been the fascinating area of interest for condensedmatter physicists. Antiferromagnetic order coexisting with superconductivity in ba 0. The model is re ned to consider also the second nearestneighbor hopping. Therefore, the fermi surface of htsc is very close to the fermi surface of the doped cuo 2 plane or multiplanes, in case of multilayer cuprates and can be presented on the 2d reciprocal space or momentum space of the cuo 2 lattice. Evidence for coexistence of bulk superconductivity and itinerant antiferromagnetism in the heavy fermion system cecoin 1. Coexistence of antiferromagnetism and lattice distortion in.
It is not clear at present how these two phases occur together, but there is evidence that they are in a microscopic coexistence 1. Antiferromagnetism and quantum criticality in insulators 2. Experimental study on the newly discovered iron pnictide superconductor found that magnetism and superconductivity coexisted in the long rang doping in smaso1xfxfe 0. Coexistence of glassy antiferromagnetism and giant. Coexistence of superconductivity and antiferromagnetism in the hubbard model for cuprates a. This issue is tied to attempts to understand the pairing mechanism of these materials.
Despite the competition, the superconductivity sets in before the af order is completely destroyed and coexists with latter in a certain range of hole doping. Journal of magnetism and magnetic materials 263 2003 3237 coexistence of glassy antiferromagnetism and giant magnetoresistance in fecr multilayer structures. A sudden broadening of the superlattice lines on cooling below t li indicates the. If superconductivity and static longrange af order coexist microscopically and compete for the same electrons, the superconducting pairing symmetry is. S09538984023512 coexistence of charge density wave and antiferromagnetism in er 5ir 4si 10 f galli 1, r feyerherm2,rwahendrikx, e dudzik2, g j nieuwenhuys1, s ramakrishnan3,sdbrown4, s van smaalen5 and j a mydosh1 1. There are also examples of disordered materials such as iron phosphate glasses that become antiferromagnetic below their neel. Coexistence of superconductivity and antiferromagnetism in the hubbard model for cuprates article pdf available may 2019 with 116 reads how we measure reads. It also suggests the existence of further unimagined forms of superconductivity.
We consider a general dwave superconducting gap function in the presence of coexisting antiferromagnetic afm longrange order. Both orders are found to emerge from an anisotropic 3d metallic state, upon which antiferromagnetism opposes superconductivity by driving the doped holes towards localization. It is found that the antiferromagnetism as a function of doping is consistent with the existing numerical calculation in the normal state. Many current research efforts in strongly correlated systems focus on the interplay between magnetism and superconductivity. Coexistence of antiferromagnetism and superconductivity of t. Spinspin interactions can then have a great importance in the panorama of superconducting systems. Jul 30, 2015 evidence for coexistence of bulk superconductivity and itinerant antiferromagnetism in the heavy fermion system cecoin 1. It has been shown that a microscopically homogeneous coexistence phase of antiferromagnetism and superconductivity is implemented in the vicinity of the critical point, which was experimentally found in the heavyfermion compound cerhin 5. All superconducting materials known at ordinary pressures currently work far.
In this region, the pressure increase is accompanied by the experimentally observed strong growth of the. Moreover, antiferromagnetic order is shown to coexist with superconductivity. Novel coexistence of superconductivity with two distinct. In cases where super conductivity and magnetic order coexist, such as rareearth based molybdenum chalcogenides, rhodium borides and borocarbides, the superconducting d electrons and localized f electrons are weakly coupled, and the competition between superconductivity and magnetic order. Competition andor coexistence of antiferromagnetism and. The interplay of magnetism and superconductivity in heavy fermion materials is a remarkable issue. In materials that exhibit antiferromagnetism, the magnetic moments of atoms or molecules, usually related to the spins of electrons, align in a regular pattern with neighboring spins on different sublattices pointing in opposite directions.
An extended hubbard model is used to investigate the conditions for the existence and the stability of a spindensitywave sdw antiferromagnetic afm state with lattice distortion in a system with a chemicallyinduced charge density wave cdw. How is antiferromagnetism related to superconductivity. Experimental study on the newly discovered iron pnictide superconductor found that magnetism and super conductivity coexisted in the long rang doping in smaso1xfxfe 0. When the superconducting instability is considered, the superconductivity and antiferromagnetism can coexist in a broad doping regime, which is again in good agreement with the numerical calculation. Antiferromagnetic order coexisting with superconductivity. The evolution of the high temperature superconductors containing cu2o planes known as cuprates from the mott insulating state in the parent composition to the superconducting phase with insertion or extraction of electrons doping remains an important unsolved problem. Unconventional superconductors are those which are not described by bcs theory. Theory predicts that coexistence of an sdw and super conductivity is possible where phases of the superconducting wave functions on different portions of the fermi surface with s gap symmetry are different by a factor of. Iron selenide superconductors exhibit a number of unique characteristics that are helpful for understanding the mechanism of superconductivity in hightc ironbased superconductors more generally. Coexistence of charge density wave and antiferromagnetism in er5ir4si10 5069 the hightemperature transition strongly suggests that the mechanism of this transition is a commensurate structural transformation followed by the development of an incommensurate cdw. Coexistence of dwave super conductivity with other phases in underdoped cuprates, such as antiferromagnetism or chargedensity waves, may drastically alter. Coexistence of antiferromagnetism and superconductivity of tt. Nmr investigation of superconductivity and antiferromagnetism in cafe2as2 under pressure.
An antiferromagnetparamagnet firstorder phase transition is found. Novel coexistence ofsuperconductivity withtwodistinct. The electronic structure of superconducting cuprates is highly anisotropic see the crystal structure of ybco or bscco. Coexistence of superconductivity and magnetism in low. The coexistence of felectron superconductivity with two distinct felectron magnetic orders is unique among unconventional superconductors, adding a new variety to the usual coexistence found in magnetic superconductors. Coexistence of charge density wave and antiferromagnetism. Novel coexistence ofsuperconductivity withtwodistinct magnetic orders. Coexistence and competition of the shortrange incommensurate. Antiferromagnetism exists near superconductivity in the electronic phase diagram of a variety of seemingly unrelated unconventional superconductors. The model is re ned to consider also the second nearest. The afspin polarization at the ip is found to induce the cu moments of. Furthermore, while too much antiferromagnetism quenches superconductivity, experiments indicate that too little, in the form of residual. Microscopic coexistence of a twocomponent incommensurate.
Both orders are found to emerge from an anisotropic 3d metallic state, upon which antiferromagnetism opposes superconductivity by. Coexistence of antiferromagnetism and superconductivity in heavy fermion cerium compound ce 3 pdin 11. T of ce 3 pdin 11 with current applied along different crystallographic axes is shown in fig. At intermediate x where antiferromagnetism coexists with superconductivity, two types of magnetic. A variety of systems, such as cuprates, heavy fermions, and iron pnictides showed superconductivity in a narrow region near the border to antiferromagnetism afmas a function of pressure or doping. To shed light on this physics, the zerotemperature value of. We find that the dwave order parameter develops additional nodes without lowering the symmetry of the state due to the. Request pdf coexistence of superconductivity and antiferromagnetism in cerh1xcoxin5 singlecrystal specimens of cerh1xcoxin5 have been investigated by means of specific heat, electrical.
Chapter 12 ferromagnetism and antiferromagnetism a ferromagnet has a spontaneous maggppnetic moment in zero applied magnetic field. Motivated by recent experimental study of antiferromagnetic property of honeycomb compound in 3 cu 2 vo 9 yan et al. Request pdf the coexistence of superconductivity and antiferromagnetism it is shown that the exchange interaction in an ensemble of itinerant electrons gives rise to a super. In this letter we consider the interplay of antiferro magnetism af and triplet superconductivity tsc in quasionedimensional q1d electron systems.
Coexistence of antiferromagnetism and superconductivity in a meanfield theory of hightc superconductors. Renormalizationgroup analysis of coupled superconducting order and stripe order. Coexistence of antiferromagnetism and superconductivity of. So4 theory of antiferromagnetism and superconductivity in. Doping dependence of the pinning efficiency in kdoped ba122. Spinspin interactions can then have a great importance in the panorama of. Coexistence of antiferromagnetism and superconductivity in a. Coexistence of superconductivity and magnetism have always been the fascinating area of interest for condensedmatter physicists. So4 theory of antiferromagnetism and superconductivity. The coexistence of superconductivity and antiferromagnetism. The present article is an extension of the previous work.
J model on the honeycomb lattice as our starting point and employ the slaveboson meanfield theory. In cases where super conductivity and magnetic order coexist, such as rareearth based molybdenum chalcogenides, rhodium borides. A quantity which is of interest, not just for applications, but also for the understanding of the microscopic pinning. Coexistence of antiferromagnetism and superconductivity in. We report on detailed ac calorimetry measurements under high pressure and magnetic field of cerhin5. Coexistence of superconductivity, ferromagnetism and.
Coexistence of superconductivity and antiferromagnetism in low dimensional conductors can be explained by a phase segregation scenario. Renormalizationgroup analysis of coupled superconducting. Coexistence of antiferromagnetism and superconductivity in cerhin5 under high pressure and magnetic field authors. Coexistence of antiferromagnetism and d id superconducting. Coexistence of charge density wave and antiferromagnetism in. Ahi ifassume each magnetic atom experience a fild i l hield proportional to the.
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