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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Ionic Crystal Structures02:42

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Researchers created a novel ordered-stacking amorphous layer structure in SiP2 using high pressure. This unique material exhibits two-dimensional superconductivity, expanding the understanding of topological order in solids.

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Area of Science:

  • Solid-state physics
  • Materials science
  • Condensed matter physics

Background:

  • Quasicrystals and ordered amorphous carbon clusters expand the understanding of static topological order in solids.
  • Knowledge of unconventional structures from disordered building blocks is limited.

Purpose of the Study:

  • To construct an ordered-stacking amorphous layer structure in SiP2.
  • To investigate the properties of this novel structure, particularly superconductivity.

Main Methods:

  • High-pressure synthesis method.
  • Scanning transmission electron microscopy (STEM) and X-ray diffraction (XRD) for structural validation.
  • Measurements of Berezinskii-Kosterlitz-Thouless transition and anisotropic upper critical field.
  • Theoretical calculations.

Main Results:

  • Successfully constructed an ordered-stacking amorphous layer structure in SiP2.
  • Observed two-dimensional superconductivity in the SiP2 bulks.
  • Theoretical calculations explained the stabilization of the layered structure and 2D superconductivity through lone-pair electron repulsion.

Conclusions:

  • Introduced a new category of solid-state materials based on the degree of static topological order.
  • Demonstrated the potential for discovering exotic properties in unconventional structures.
  • Highlighted the role of high pressure in creating novel materials with unique electronic properties.