A Scanning Tunneling Microscope at the Milli-Kelvin, High Magnetic Field Frontier
... techniques to lower temperature and higher magnetic fields has expanded our perception to the far-ranging nuances of this symphony with mother nature as its maestro. From the liquefaction of helium by Kamerlingh Onnes in 1908 came his discovery of superconductivity in elemental mercury (1911) [1] an ...
... techniques to lower temperature and higher magnetic fields has expanded our perception to the far-ranging nuances of this symphony with mother nature as its maestro. From the liquefaction of helium by Kamerlingh Onnes in 1908 came his discovery of superconductivity in elemental mercury (1911) [1] an ...
Computer Assisted Physics - Physik
... arising from both on-site (3d) and off site (oxygen 2p) basis functions belong to region II. Region III contains no reference to the on-site basis functions. This partitioning scheme was chosen in an attempt to find a correlation with the most commonly used point-ion model, the Sternheimer equation: ...
... arising from both on-site (3d) and off site (oxygen 2p) basis functions belong to region II. Region III contains no reference to the on-site basis functions. This partitioning scheme was chosen in an attempt to find a correlation with the most commonly used point-ion model, the Sternheimer equation: ...
The unique electronic structure of Ca10 (Pt4As8)(Fe2
... Pt4 As8 layer contributes to a small electron-like Fermi surface, indicative of metallic charge reservoir layers that are rare for iron based superconductors. Moreover, the electronic structure of the FeAs-layers resembles those of other prototype iron pnictides to a large extent. However, there is ...
... Pt4 As8 layer contributes to a small electron-like Fermi surface, indicative of metallic charge reservoir layers that are rare for iron based superconductors. Moreover, the electronic structure of the FeAs-layers resembles those of other prototype iron pnictides to a large extent. However, there is ...
Article Reference - Archive ouverte UNIGE
... pnictogen).7 Among these families, iron chalcogenides are considered of particular interest because of their simple crystal structure consisting of Fe ions tetrahedrally coordinated by Se and Te arranged in layers stacked along the c axis, without any other interlayer cations, as occurs in the pnict ...
... pnictogen).7 Among these families, iron chalcogenides are considered of particular interest because of their simple crystal structure consisting of Fe ions tetrahedrally coordinated by Se and Te arranged in layers stacked along the c axis, without any other interlayer cations, as occurs in the pnict ...
PhD Thesis 2016 Prof. Xavier Obradors Berenguer
... as a function of the oxygen content. A value of =0 indicates that the oxygen vacancies are completely occupied, whereas =1 means that the structure is oxygen deficient. ................... 25 Figure 2.3 Magnetic and electric behaviour of YBa2Cu3O7- compound as a function of x=7- oxygen content.. ...
... as a function of the oxygen content. A value of =0 indicates that the oxygen vacancies are completely occupied, whereas =1 means that the structure is oxygen deficient. ................... 25 Figure 2.3 Magnetic and electric behaviour of YBa2Cu3O7- compound as a function of x=7- oxygen content.. ...
Electric field-induced superconducting transition of insulating
... It is thought that strong electron correlation in an insulating parent phase would enhance a critical temperature (Tc) of superconductivity in a doped phase via enhancement of the binding energy of a Cooper pair as known in high-Tc cuprates. To induce a superconductor transition in an insulating pha ...
... It is thought that strong electron correlation in an insulating parent phase would enhance a critical temperature (Tc) of superconductivity in a doped phase via enhancement of the binding energy of a Cooper pair as known in high-Tc cuprates. To induce a superconductor transition in an insulating pha ...
Theory of magnetic-field-induced phase transitions in quasi
... of the projection of H on the c* axis, which testifies to their orbital origin. It is remarkable that the sequence of phase transitions in a magnetic field is observed only if the material is superconducting in a zero magnetic field: for X = PF, (Refs. 4, l l ) , X = C10, (Ref. I ) , X = ReO, (Ref. ...
... of the projection of H on the c* axis, which testifies to their orbital origin. It is remarkable that the sequence of phase transitions in a magnetic field is observed only if the material is superconducting in a zero magnetic field: for X = PF, (Refs. 4, l l ) , X = C10, (Ref. I ) , X = ReO, (Ref. ...
Studies of Oxygen Deficient Complex Cobaltates with Perovskite Related Structures.
... It´s a perovskite material world. For technological development, and to meet new demands of tomorrow’s society, there is a constant need for new materials with new or improved properties. The perovskite structure 1 has long attracted interest and continues to do so, because properties suitable for ...
... It´s a perovskite material world. For technological development, and to meet new demands of tomorrow’s society, there is a constant need for new materials with new or improved properties. The perovskite structure 1 has long attracted interest and continues to do so, because properties suitable for ...
Metal
... sharing of electrons between adjacent atoms. ● Two atoms that are covalently bonded will each contribute at least one electron to the bond, and the shared electrons may be considered to belong to both atoms. ● The covalent bond is directional; it is between specific atoms and may exist only in the d ...
... sharing of electrons between adjacent atoms. ● Two atoms that are covalently bonded will each contribute at least one electron to the bond, and the shared electrons may be considered to belong to both atoms. ● The covalent bond is directional; it is between specific atoms and may exist only in the d ...
Fermionic Vortices Find their Dual - Physics (APS)
... When I said that (3+1)-dimensional QED had a duality that interchanged the electric and magnetic charges, one could have complained that the electron is a fermion, while a magnetic monopole may not be. However, the authors observe that in a TI, a charge-two monopole is also a fermion. By analyzing t ...
... When I said that (3+1)-dimensional QED had a duality that interchanged the electric and magnetic charges, one could have complained that the electron is a fermion, while a magnetic monopole may not be. However, the authors observe that in a TI, a charge-two monopole is also a fermion. By analyzing t ...
Low temperature London penetration depth and superfluid density
... spins and momenta. The pairing is caused by electron-phonon interactions, the strength of which determines Tc . Pairing is isotropic and leads to a superconducting gap which is constant over the Fermi surface, so-called s-wave pairing. In the BCS scenario, Tc would be dependent on the strength of el ...
... spins and momenta. The pairing is caused by electron-phonon interactions, the strength of which determines Tc . Pairing is isotropic and leads to a superconducting gap which is constant over the Fermi surface, so-called s-wave pairing. In the BCS scenario, Tc would be dependent on the strength of el ...
Josephson current in a superconductor
... Fermi level,5 the Cooper pair wave function shows damped oscillations in the ferromagnet, leading to the appearance of the so-called “π state” in SFS junctions.6 In the π state, the superconducting order parameter is of opposite sign in the two S electrodes of the Josephson junction, and thus a macr ...
... Fermi level,5 the Cooper pair wave function shows damped oscillations in the ferromagnet, leading to the appearance of the so-called “π state” in SFS junctions.6 In the π state, the superconducting order parameter is of opposite sign in the two S electrodes of the Josephson junction, and thus a macr ...
Spintronic materials based on main-group elements
... splitting in the case of a magnetic system, while the second degeneracy can be strongly lifted by the chemical bonding in a solid. Consequently, the net result is very much dependent on details of the bandstructure. In NiMnSb, for example, it is minimal, since the three bands intersecting the Fermi ...
... splitting in the case of a magnetic system, while the second degeneracy can be strongly lifted by the chemical bonding in a solid. Consequently, the net result is very much dependent on details of the bandstructure. In NiMnSb, for example, it is minimal, since the three bands intersecting the Fermi ...
Characteristic properties of two-dimensional superconductors close
... With the discovery of superconductivity in mercury at 4K by Kamerlingh Onnes in 1911, a search for more superconducting materials with higher transition temperatures Tc began. Over decades this led to a gradual increase in the highest known transition temperature, up to a plateau at 23K with the dis ...
... With the discovery of superconductivity in mercury at 4K by Kamerlingh Onnes in 1911, a search for more superconducting materials with higher transition temperatures Tc began. Over decades this led to a gradual increase in the highest known transition temperature, up to a plateau at 23K with the dis ...
Effect of MnO2 doping on the dielectric properties of barium titanate
... Polycrystalline samples of BaTiO3 + x wt. % MnO2 (x = 0.01; 0.1) were prepared using a solidstate synthesis. The samples were synthesised from an analytically pure barium carbonate BaCO3, titanium oxide TiO2, and manganese oxide MnO2. A mixture of the raw materials was homogenised and ground in an a ...
... Polycrystalline samples of BaTiO3 + x wt. % MnO2 (x = 0.01; 0.1) were prepared using a solidstate synthesis. The samples were synthesised from an analytically pure barium carbonate BaCO3, titanium oxide TiO2, and manganese oxide MnO2. A mixture of the raw materials was homogenised and ground in an a ...
High-temperature superconductivity
High-temperature superconductors (abbreviated high-Tc or HTS) are materials that behave as superconductors at unusually high temperatures. The first high-Tc superconductor was discovered in 1986 by IBM researchers Georg Bednorz and K. Alex Müller, who were awarded the 1987 Nobel Prize in Physics ""for their important break-through in the discovery of superconductivity in ceramic materials"".Whereas ""ordinary"" or metallic superconductors usually have transition temperatures (temperatures below which they superconduct) below 30 K (−243.2 °C), and must be cooled using liquid helium in order to achieve superconductivity, HTS have been observed with transition temperatures as high as 138 K (−135 °C), and can be cooled to superconductivity using liquid nitrogen. Until 2008, only certain compounds of copper and oxygen (so-called ""cuprates"") were believed to have HTS properties, and the term high-temperature superconductor was used interchangeably with cuprate superconductor for compounds such as bismuth strontium calcium copper oxide (BSCCO) and yttrium barium copper oxide (YBCO). However, several iron-based compounds (the iron pnictides) are now known to be superconducting at high temperatures.For an explanation about Tc (the critical temperature for superconductivity), see Superconductivity § Superconducting phase transition and the second bullet item of BCS theory § Successes of the BCS theory.