Van Vleck paramagnetism
E665838
Van Vleck paramagnetism is a quantum-mechanical form of paramagnetism arising from the mixing of electronic energy levels by an applied magnetic field, even in systems with no permanent magnetic moment in the ground state.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Van Vleck paramagnetism canonical | 1 |
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
form of paramagnetism
ⓘ
quantum-mechanical magnetic phenomenon ⓘ |
| appearsIn |
insulating rare-earth salts
ⓘ
lanthanide compounds ⓘ some organic radicals with singlet ground states ⓘ |
| arisesFrom | second-order perturbation of electronic states by a magnetic field ⓘ |
| canCoexistWith |
Curie paramagnetism
ⓘ
Pauli paramagnetism ⓘ |
| canOccurIn |
closed-shell ions
ⓘ
insulating solids ⓘ molecular crystals ⓘ rare-earth ions ⓘ systems with singlet ground states ⓘ transition-metal complexes ⓘ |
| category |
magnetochemistry
ⓘ
quantum magnetism ⓘ solid-state physics ⓘ |
| contributesTo | total magnetic susceptibility of solids ⓘ |
| contributionType | orbital contribution to paramagnetism ⓘ |
| dependsOn |
crystal-field splitting
ⓘ
quantum-mechanical mixing of electronic energy levels ⓘ spin–orbit coupling ⓘ |
| describedBy | Van Vleck susceptibility formula NERFINISHED ⓘ |
| distinctFrom |
Curie paramagnetism
ⓘ
Langevin paramagnetism ⓘ Pauli paramagnetism ⓘ |
| fieldRegime | usually treated in low-field limit ⓘ |
| frameworkDevelopedBy | John Hasbrouck Van Vleck NERFINISHED ⓘ |
| importantIn |
crystal-field theory
NERFINISHED
ⓘ
interpretation of EPR spectra ⓘ magnetism of coordination compounds ⓘ rare-earth magnetism ⓘ |
| magnetizationProportionalTo | applied magnetic field ⓘ |
| mathematicallyExpressedAs | sum over excited states of squared magnetic-moment matrix elements divided by energy separations ⓘ |
| namedAfter | John Hasbrouck Van Vleck NERFINISHED ⓘ |
| occursIn | systems with no permanent magnetic moment in the ground state ⓘ |
| relatedTo |
magnetic susceptibility theory
ⓘ
second-order Zeeman effect ⓘ |
| requires |
excited electronic states close in energy to the ground state
ⓘ
non-zero matrix elements of the magnetic moment operator between ground and excited states ⓘ |
| susceptibilitySign | positive ⓘ |
| temperatureDependence |
often nearly temperature independent
ⓘ
weak ⓘ |
| usedIn |
analysis of magnetic anisotropy
ⓘ
interpretation of temperature-independent paramagnetism in solids ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.