de Haas–van Alphen effect
E48478
The de Haas–van Alphen effect is a quantum oscillatory phenomenon in metals where the magnetization varies periodically with applied magnetic field, allowing precise mapping of the electronic structure and Fermi surface.
All labels observed (2)
| Label | Occurrences |
|---|---|
| de Haas–van Alphen effect canonical | 10 |
| Shubnikov–de Haas effect | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T380060 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: de Haas–van Alphen effect Context triple: [Fermi surface, probedBy, de Haas–van Alphen effect]
-
A.
Meissner effect
The Meissner effect is the phenomenon in which a superconductor expels magnetic fields from its interior when cooled below its critical temperature, leading to perfect diamagnetism.
-
B.
Zeeman effect
The Zeeman effect is the splitting of atomic or molecular spectral lines into multiple components when subjected to an external magnetic field, revealing information about energy levels and magnetic moments.
-
C.
London equations
The London equations are fundamental relations in superconductivity that describe how magnetic fields behave inside superconductors, capturing key features like the Meissner effect and zero electrical resistance.
-
D.
Eliashberg theory
Eliashberg theory is an extension of BCS superconductivity that incorporates strong-coupling and frequency-dependent effects to more accurately describe real superconducting materials.
-
E.
Stark effect
The Stark effect is the splitting and shifting of atomic or molecular spectral lines caused by an external electric field.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: de Haas–van Alphen effect Target entity description: The de Haas–van Alphen effect is a quantum oscillatory phenomenon in metals where the magnetization varies periodically with applied magnetic field, allowing precise mapping of the electronic structure and Fermi surface.
-
A.
Meissner effect
The Meissner effect is the phenomenon in which a superconductor expels magnetic fields from its interior when cooled below its critical temperature, leading to perfect diamagnetism.
-
B.
Zeeman effect
The Zeeman effect is the splitting of atomic or molecular spectral lines into multiple components when subjected to an external magnetic field, revealing information about energy levels and magnetic moments.
-
C.
London equations
The London equations are fundamental relations in superconductivity that describe how magnetic fields behave inside superconductors, capturing key features like the Meissner effect and zero electrical resistance.
-
D.
Eliashberg theory
Eliashberg theory is an extension of BCS superconductivity that incorporates strong-coupling and frequency-dependent effects to more accurately describe real superconducting materials.
-
E.
Stark effect
The Stark effect is the splitting and shifting of atomic or molecular spectral lines caused by an external electric field.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
magneto-oscillatory effect
ⓘ
quantum oscillatory phenomenon ⓘ solid-state physics phenomenon ⓘ |
| allows |
determination of scattering rates
ⓘ
mapping of Fermi surface topology ⓘ measurement of effective electron masses ⓘ precise determination of Fermi surface cross-sectional areas ⓘ |
| characterizedBy |
periodic variation of magnetization with inverse magnetic field
ⓘ
quantum oscillations in thermodynamic quantities ⓘ |
| dependsOn |
Fermi surface geometry
ⓘ
applied magnetic field ⓘ quantization of electron orbits in momentum space ⓘ temperature ⓘ |
| describes | oscillations of magnetization in a metal as a function of magnetic field ⓘ |
| discoveredIn | 1930s ⓘ |
| field |
condensed matter physics
ⓘ
low-temperature physics ⓘ solid-state physics ⓘ |
| hasCause |
Landau quantization of electron orbits in a magnetic field
ⓘ
discrete Landau levels crossing the Fermi energy ⓘ |
| hasProperty |
amplitude damped by impurity scattering
ⓘ
amplitude damped by temperature ⓘ oscillation frequency proportional to extremal Fermi surface cross-sectional area ⓘ |
| isDifferentFrom |
Pauli paramagnetism
ⓘ
classical diamagnetism ⓘ |
| isExampleOf | quantum magnetization oscillations ⓘ |
| measurementTechnique |
magnetization measurements in high magnetic fields
ⓘ
torque magnetometry ⓘ |
| namedAfter |
Pieter M. van Alphen
ⓘ
Wander Johannes de Haas ⓘ |
| occursIn |
degenerate electron systems
ⓘ
metals ⓘ semimetals ⓘ |
| relatedTo |
Landau levels
ⓘ
Lifshitz–Kosevich formula ⓘ Shubnikov–de Haas effect ⓘ quantum oscillations ⓘ |
| requiresCondition |
low temperatures
ⓘ
strong magnetic fields ⓘ |
| studiedUsing |
cryogenic techniques
ⓘ
high-field magnets ⓘ |
| usedFor |
Fermi surface studies in metals
ⓘ
characterization of strongly correlated electron systems ⓘ study of heavy-fermion compounds ⓘ study of unconventional superconductors ⓘ testing band-structure calculations ⓘ |
| usesFormula | Lifshitz–Kosevich formula ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: de Haas–van Alphen effect Description of subject: The de Haas–van Alphen effect is a quantum oscillatory phenomenon in metals where the magnetization varies periodically with applied magnetic field, allowing precise mapping of the electronic structure and Fermi surface.
Referenced by (11)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: de Haas–van Alphen effect