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Heavy fermion material — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Heavy_fermion_material
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-15T17:37:25.492Z
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Heavy fermion material — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Heavy_fermion_material (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_48eeea65eaee (Metraipolis archive dc_48eeea65eaee, sha256 d1e82338faed66a372fde7506f3e612076d78eaa9946dd474475a2b81bb4bf54)

BibTeX

@misc{dc48eeea65eaee,
  title = {Heavy fermion material — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Heavy_fermion_material},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_48eeea65eaee; sha256 d1e82338faed66a372fde7506f3e612076d78eaa9946dd474475a2b81bb4bf54},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Heavy_fermion_material. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

In materials science, heavy fermion materials are a specific type of intermetallic compound, containing elements with 4f or 5f electrons in unfilled electron bands. Electrons are one type of fermion, and when they are found in such materials, they are sometimes referred to as heavy electrons. Heavy fermion materials have a low-temperature specific heat whose linear term is up to 1,000 times larger than the value expected from the free electron model. The properties of the heavy fermion compounds often derive from the partly filled f-orbitals of rare-earth or actinide ions, which behave like localized magnetic moments. The name "heavy fermion" comes from the fact that the fermion behaves as if it has an effective mass greater than its rest mass. In the case of electrons, below a characteristic temperature (typically 10 K), the conduction electrons in these metallic compounds behave as if they had an effective mass up to 1,000 times the free particle mass. This large effective mass is also reflected in a large contribution to the resistivity from electron-electron scattering via the Kadowaki–Woods ratio. Heavy fermion behavior has been found in a broad variety of states including metallic, superconducting, insulating and magnetic states. Characteristic examples are CeCu6, CeAl3, CeCu2Si2, YbAl3, UBe13 and UPt3.

Tema degli esploratori: fisica e astronomia (deposito sistematico; categoria «Condensed matter physics»).
Fonte: Wikipedia in inglese, voce «Heavy fermion material» — https://en.wikipedia.org/wiki/Heavy_fermion_material
Wikidata Q1060530 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q1060530
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Heavy_fermion_material?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1334009078, consultata il 2026-10-15T16:27:06.777Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 1228b0eb89c1e63291c63a392197b8e1687b299ccbc9bf381f026db4c5a2dee5