The relevant bosons at the liquid-solid transition
Using the cubic alkali halogenides as model materials, it is shown that the cohesion of the solids up to the rather high melting temperatures, Tm, is not by the inter-atomic interactions but by a boson field. A reasonable measure of the absolute interatomic interaction strength is given by the Debye...
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-08-01
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| Series: | Physics Open |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666032625000419 |
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| Summary: | Using the cubic alkali halogenides as model materials, it is shown that the cohesion of the solids up to the rather high melting temperatures, Tm, is not by the inter-atomic interactions but by a boson field. A reasonable measure of the absolute interatomic interaction strength is given by the Debye-temperature, ΘD, which is much lower than Tm. It is explained that in the wide temperature range ΘD < T < Tm, the dynamics is the dynamics of a boson field. This is evidenced by the observed universality in the temperature dependence of heat capacity and relative thermal length changes, ΔL/L0 below Tm. The boson field orders at Tm and defines the perfect long-range atomic order of the crystalline state. Upon ordering all bosons condense in the lowest quantum state (Bose-Einstein condensation). This is the highest possible thermodynamic order, and provides a plausible entropy argument for the exclusion of the interatomic interactions at order-disorder phase transitions. Additionally, ordered boson fields contract themselves to a finite volume such as a domain. The mosaic blocks, occurring in, practically, all crystalline solids, have to be viewed as the domains of the bosons that order at Tm. Within each mosaic block, the bosons are in a stationary mode. The constricting force of the ordered boson field that compresses each mosaic block increasingly with decreasing temperature, guarantees the cohesion of the whole solid up to Tm. Plausible arguments are given that the bosons that order at Tm are elastic quadrupole radiation. |
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| ISSN: | 2666-0326 |