Ferroelectrics from first principles Designing ferroelectrics
... ferroelectricity has been theoretically predicted in ordered perovskites and the Ruddlesden–Popper compounds (Ca3 Ti2 O7 , Ca3 Mn2 O7 and (Ca/Sr/Ba)3 (Sn/Zr/Ge)2 O7 ). However, the ferroelectricity of these compounds has never been experimentally confirmed and even their polar nature has been under ...
... ferroelectricity has been theoretically predicted in ordered perovskites and the Ruddlesden–Popper compounds (Ca3 Ti2 O7 , Ca3 Mn2 O7 and (Ca/Sr/Ba)3 (Sn/Zr/Ge)2 O7 ). However, the ferroelectricity of these compounds has never been experimentally confirmed and even their polar nature has been under ...
Complete list of Abstracts - MSU Department of Physics and
... combination reactions to synthesize a family of supertetrahedral mixed metal clusters. Unlike other known supertetrahedral clusters which can be considered as excised fragments form the diamond lattice, the ones we describe here have a different structural motif. In this talk we present extension of ...
... combination reactions to synthesize a family of supertetrahedral mixed metal clusters. Unlike other known supertetrahedral clusters which can be considered as excised fragments form the diamond lattice, the ones we describe here have a different structural motif. In this talk we present extension of ...
________________Table des Matières_______________
... In Part I we present the study of the growth of manganite based thin films on single crystalline substrates. This work focuses on ferromagnetic lanthanum based manganites with an optimum Ca doping of x=1/3, which exhibit Colossal Magnetoresistance at the metal/insulator transition temperature. Such ...
... In Part I we present the study of the growth of manganite based thin films on single crystalline substrates. This work focuses on ferromagnetic lanthanum based manganites with an optimum Ca doping of x=1/3, which exhibit Colossal Magnetoresistance at the metal/insulator transition temperature. Such ...
SOLIDE STATE Introduction : Crystalline and
... crystal are assumed to be spherical then in crystal formation this particles are arranged as under. In crystalline solid, each type of crystal is described by crystal lattice OR space lattice. (network OR pattern) A crystal lattice is defined as a pattern of points which describe the arrangement of ...
... crystal are assumed to be spherical then in crystal formation this particles are arranged as under. In crystalline solid, each type of crystal is described by crystal lattice OR space lattice. (network OR pattern) A crystal lattice is defined as a pattern of points which describe the arrangement of ...
Nonequilibrium transport in mesoscopic multi-terminal SNS Josephson junctions * M. S. Crosser,
... junction.” This effect is produced by applying a voltage that suitably modifies the form of the distribution function. This paper presents results of several experiments performed on S/N/S Josephson junctions with extra leads connecting the N part of the devices to large normal reservoirs. Samples a ...
... junction.” This effect is produced by applying a voltage that suitably modifies the form of the distribution function. This paper presents results of several experiments performed on S/N/S Josephson junctions with extra leads connecting the N part of the devices to large normal reservoirs. Samples a ...
Study of Structural, Magnetic and Electrical
... Materials which exhibit simultaneous presence of magnetic and electric ordering are called multiferroics [1-3]. These materials have been studied due to both, their potential applications for electronic devices and interesting physics in it. BiFeO3 (BFO) is a well-known multiferroic at room temperat ...
... Materials which exhibit simultaneous presence of magnetic and electric ordering are called multiferroics [1-3]. These materials have been studied due to both, their potential applications for electronic devices and interesting physics in it. BiFeO3 (BFO) is a well-known multiferroic at room temperat ...
The surprising role of magnetism on the phase stability of Fe
... metastable regions (shown by dashed lines), which seem quite reasonable. Both magnetic states stabilize the respective crystal structures at low temperatures. Question 1 can now be addressed as follows. At 0 K, the ferromagnetic ordering in the BCC α phase causes the internal energy (and enthalpy) o ...
... metastable regions (shown by dashed lines), which seem quite reasonable. Both magnetic states stabilize the respective crystal structures at low temperatures. Question 1 can now be addressed as follows. At 0 K, the ferromagnetic ordering in the BCC α phase causes the internal energy (and enthalpy) o ...
Increased superconductivity for CNT doped
... . Referencing the Maxwell equation , the Lorenz force can be written as . CNTs will be driven to move in the mushy environment of melting magnesium by the Lorentz force, which enforces carbon substitution for boron because of the increased contact area between the CNT and the MgB during the reaction ...
... . Referencing the Maxwell equation , the Lorenz force can be written as . CNTs will be driven to move in the mushy environment of melting magnesium by the Lorentz force, which enforces carbon substitution for boron because of the increased contact area between the CNT and the MgB during the reaction ...
Electrodynamics of the nodal metal state in weakly doped high-
... 共incomplete兲 gap in the spectrum of the low-energy excitations.22 Spectroscopic signatures of the pseudogap are most clearly seen in the interplane c axis optical conductivity showing a depletion of the far-IR spectral weight below T*.23,24 Changes of the in-plane response probed in the polarization ...
... 共incomplete兲 gap in the spectrum of the low-energy excitations.22 Spectroscopic signatures of the pseudogap are most clearly seen in the interplane c axis optical conductivity showing a depletion of the far-IR spectral weight below T*.23,24 Changes of the in-plane response probed in the polarization ...
Reactions of Oxygen with the Platinum Metals
... oxides in the ruthenium-oxygen system (the most complex, apparently, of the platinum metal-oxygen systems) are now available. A very careful study(2)of this system has recently been made by Wayne E. Bell and M. Tagami of the General Atomic Division of General Dynamics Corporation, working in the Joh ...
... oxides in the ruthenium-oxygen system (the most complex, apparently, of the platinum metal-oxygen systems) are now available. A very careful study(2)of this system has recently been made by Wayne E. Bell and M. Tagami of the General Atomic Division of General Dynamics Corporation, working in the Joh ...
Heavy Fermions: Electrons at the Edge of
... varieties of heavy-electron material, many developing new and exotic phases at low temperatures. This chapter is intended as a perspective on the the current theoretical and experimental understanding of heavy-electron materials. There are important links between the material in this chapter and the ...
... varieties of heavy-electron material, many developing new and exotic phases at low temperatures. This chapter is intended as a perspective on the the current theoretical and experimental understanding of heavy-electron materials. There are important links between the material in this chapter and the ...
Application of the underscreened Kondo lattice model to neptunium
... compound, if we take the Kondo temperature TK equal to T ∗ of order 12 K, which is clearly much smaller than the Curie temperature TC =51.5 K. There is another ferromagnetic and Kondo neptunium compound, namely Np2 PdGa3 , which has been recently studied experimentally [3]. The magnetic resistivity, ...
... compound, if we take the Kondo temperature TK equal to T ∗ of order 12 K, which is clearly much smaller than the Curie temperature TC =51.5 K. There is another ferromagnetic and Kondo neptunium compound, namely Np2 PdGa3 , which has been recently studied experimentally [3]. The magnetic resistivity, ...
Materials Science & Engineering “Because without materials, there
... • Shiny appearance • Thus, metals can be formed and machined easily, and are usually long-lasting materials. • They do not react easily with other elements, however, metals such as Fe and Al do form compounds readily (such as ores) so they must be processed to extract base metals. • One of the main ...
... • Shiny appearance • Thus, metals can be formed and machined easily, and are usually long-lasting materials. • They do not react easily with other elements, however, metals such as Fe and Al do form compounds readily (such as ores) so they must be processed to extract base metals. • One of the main ...
Twist boundary in graphene: energetics and electric field effect
... the hexagonal faces of 4H- and 6H-SiC [3–9], and more recently by surface segregation of C on Ru [10]. This technique of epitaxial growth, however, produces not single layer graphene (SLG) but multiple graphene layers, so-called graphene stacks [5]. As two layers of graphene in the lowest energy con ...
... the hexagonal faces of 4H- and 6H-SiC [3–9], and more recently by surface segregation of C on Ru [10]. This technique of epitaxial growth, however, produces not single layer graphene (SLG) but multiple graphene layers, so-called graphene stacks [5]. As two layers of graphene in the lowest energy con ...
vortices - University of Toronto Physics
... by Feynman in the early 1950’s, as fully quantum-mechanical objects. We now know that most of the flow properties of He superfluid are governed by the vortices in them, which can form very complex patterns. They can form closed ‘vortex rings’, which are also quantum objects, and which can tunnel and ...
... by Feynman in the early 1950’s, as fully quantum-mechanical objects. We now know that most of the flow properties of He superfluid are governed by the vortices in them, which can form very complex patterns. They can form closed ‘vortex rings’, which are also quantum objects, and which can tunnel and ...
Phys. Rev
... Neutron scattering off La 2- Sr CuO4 ( 0.163, SC phase) at low temperatures in H =0 (red dots) and H =7.5T (blue dots) ...
... Neutron scattering off La 2- Sr CuO4 ( 0.163, SC phase) at low temperatures in H =0 (red dots) and H =7.5T (blue dots) ...
Effect of chemical inhomogeneity in the bismuth
... thus creating patch-shaped inhomogeneities2 . These observations suggest that electronic and chemical inhomogeneity are inseparable from each other, and that the un- ...
... thus creating patch-shaped inhomogeneities2 . These observations suggest that electronic and chemical inhomogeneity are inseparable from each other, and that the un- ...
The Role of Tetrahedral Building Blocks in Low-Dimensional Oxohalide Materials Iwan Zimmermann
... can be introduced into the crystal structure. Due to their non-bonding electron pair, such elements adopt a one-sided, asymmetric coordination caused by a second order Jahn Teller (SOJT) distortion.[3-4] Lone-pairs do not participate in bonding, and therefore their terminating properties help to ope ...
... can be introduced into the crystal structure. Due to their non-bonding electron pair, such elements adopt a one-sided, asymmetric coordination caused by a second order Jahn Teller (SOJT) distortion.[3-4] Lone-pairs do not participate in bonding, and therefore their terminating properties help to ope ...
Lecture 1: Crystal structure
... Basic properties of crystal lattices • Crystal is formed from a lattice (Bravais lattice) and from a basis consisting of one or more atoms. • The basis is repeated with the symmetry of the Bravais lattice. • When travelling from a one lattice point to another, the surrounding atomic structure is th ...
... Basic properties of crystal lattices • Crystal is formed from a lattice (Bravais lattice) and from a basis consisting of one or more atoms. • The basis is repeated with the symmetry of the Bravais lattice. • When travelling from a one lattice point to another, the surrounding atomic structure is th ...
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.