scholarly journals Quantum-mechanical stability of fermion–soliton systems

2004 ◽  
Vol 596 (1-2) ◽  
pp. 1-7 ◽  
Author(s):  
Narendra Sahu ◽  
Urjit A Yajnik
Keyword(s):  
Mechanical Stability ◽  
Quantum Mechanical

Transition metal intermetallics: Structure maps based on quantum mechanical stability

2005 ◽  
Vol 178 (4) ◽  
pp. 1269-1283 ◽  
Author(s):  
Peter Michael Clark ◽  
Stephen Lee ◽  
Daniel C. Fredrickson
Keyword(s):  
Transition Metal ◽  
Mechanical Stability ◽  
Quantum Mechanical

scholarly journals An Ab Initio Study of Thermodynamic and Mechanical Stability of Heusler-Based Fe2AlCo Polymorphs

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1543 ◽  
Author(s):  
Martin Friák ◽  
Sabina Oweisová ◽  
Jana Pavlů ◽  
David Holec ◽  
Mojmír Šob
Keyword(s):  
Nearest Neighbor ◽  
Elevated Temperatures ◽  
Mechanical Stability ◽  
Magnetic Moments ◽  
Quantum Mechanical ◽  
Small Energy ◽  
Cscl Structure ◽  
Structural Configurations ◽  
Magnetic States ◽  
Full Heusler

We use quantum-mechanical calculations to test a hypothesis of Glover et al. (J. Mag. Mag. Mater. 15 (1980) 699) that Co atoms in the Fe 2 AlCo compound have on average 3 Fe and 3 Co atoms in their second nearest neighbor shell. We have simulated four structural configurations of Fe 2 AlCo including the full Heusler structure, inverse Heusler polymorph and two other phases matching this idea. The highest thermodynamic stability at T = 0 K is indeed predicted for one of the phases with the distribution of atoms according to Glover and et al. However, small energy differences among three of the studied polymorphs lead to a disordered CsCl-structure-like (B2-like) phase at elevated temperatures. The fourth variant, the full Heusler phase, is predicted to be mechanically unstable. The global magnetic states are predicted to be ferromagnetic but local magnetic moments of Fe and Co atoms sensitively depend on the composition of the first and second coordination shells.

An improved design for an Scanning Tunnelling Microscope (STM) for use in a Transmission Electron Microscope (TEM)

1991 ◽  
Vol 49 ◽  
pp. 384-385
Author(s):  
W.K. Lo ◽  
J.C.H. Spence
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Mechanical Stability ◽  
Scanning Tunnelling Microscope ◽  
Reflection Mode ◽  
Specimen Holder ◽  
Transmission Electron ◽  
Scanning Tunnelling ◽  
Improved Design

An improved design for a combination Scanning Tunnelling Microscope/TEM specimen holder is presented. It is based on earlier versions which have been used to test the usefulness of such a device. As with the earlier versions, this holder is meant to replace the standard double-tilt specimen holder of an unmodified Philips 400T TEM. It allows the sample to be imaged simultaneously by both the STM and the TEM when the TEM is operated in the reflection mode (see figure 1).The resolution of a STM is determined by its tip radii as well as its stability. This places strict limitations on the mechanical stability of the tip with respect to the sample. In this STM the piezoelectric tube scanner is rigidly mounted inside the endcap of the STM holder. The tip coarse approach to the sample (z-direction) is provided by an Inchworm which is located outside the TEM vacuum.

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