Puzzling observations of unusual responses of some multisilicate glasses at temperatures T <1 K to static magnetic fields B have been reported in the last decade and call for an extension of the standard two-level systems tunneling model. An explanation is proposed capable of capturing at the same time the T and B dependences of the heat capacity Cp and of the dielectric constant isin in these glasses. This theory points to the existence of anomalous multiwelled tunneling systems in the glasses - alongside the standard two-level systems - and indications are given for glasses which should achieve much larger electric magnetocapacitive enhancements.
|Data di pubblicazione:||2009|
|Titolo:||Multiple-well tunneling model for the magnetic-field effect in ultracold glasses|
|Rivista:||PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS|
|Digital Object Identifier (DOI):||10.1103/PhysRevB.79.180201|
|Codice identificativo ISI:||WOS:000266501200002|
|Codice identificativo Scopus:||2-s2.0-67650314219|
|Appare nelle tipologie:||Articolo su Rivista|