Publication

Low temperature calorimetric and magnetic properties of Al-Mn and Al-Mn-Si quasi-crystals

Davor Pavuna
1988
Journal Articles

Abstract

The authors report the low temperature specific heat Cp and magnetic measurements for solid solution Al-3at.percent Mn, Al86Mn14 and Al25Mn20Si5 in quasi-crystalline phases. From the amplitude of the electronic specific heat determined below 0.3K, they propose that the large density of states in the crystalline phases are due to virtual bound states related to a regime of isolated manganese impurities. Both Cp and magnetic measurements indicate a rapid evolution of the magnetic interactions from Al86Mn14 to Al25Mn20Si5. In the latter, the Χac data together with the nuclear magnetic hyperfine specific heat confirm a spin glass state similar to that of canonical spin glasses such as Cu-Mn and Au-Mn. A small fraction of Mn s atoms are magnetic sites (probably less than 10 percent) in both quasi-crystalline phases.

Official source

https://infoscience.epfl.ch/entities/publication/a67538f1-758e-4e73-b286-88cf407846eb

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Davor Pavuna
1988
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a67538f1-758e-4e73-b286-88cf407846eb

About this result

Related concepts (32)

Magnetic moment

In electromagnetism, the magnetic moment is the magnetic strength and orientation of a magnet or other object that produces a magnetic field. Examples of objects that have magnetic moments include loops of electric current (such as electromagnets), permanent magnets, elementary particles (such as electrons), composite particles (such as protons and neutrons), various molecules, and many astronomical objects (such as many planets, some moons, stars, etc).

Manganese

Manganese is a chemical element with the symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese is a transition metal with a multifaceted array of industrial alloy uses, particularly in stainless steels. It improves strength, workability, and resistance to wear. Manganese oxide is used as an oxidising agent; as a rubber additive; and in glass making, fertilisers, and ceramics. Manganese sulfate can be used as a fungicide.

Crystallinity

Crystallinity refers to the degree of structural order in a solid. In a crystal, the atoms or molecules are arranged in a regular, periodic manner. The degree of crystallinity has a big influence on hardness, density, transparency and diffusion. In an ideal gas, the relative positions of the atoms or molecules are completely random. Amorphous materials, such as liquids and glasses, represent an intermediate case, having order over short distances (a few atomic or molecular spacings) but not over longer distances.

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Low temperature calorimetric and magnetic properties of Al-Mn and Al-Mn-Si quasi-crystals

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