dc.contributor.author | COEY, JOHN | en |
dc.date.accessioned | 2015-02-19T10:20:13Z | |
dc.date.available | 2015-02-19T10:20:13Z | |
dc.date.issued | 2014 | en |
dc.date.submitted | 2014 | en |
dc.identifier.citation | Liu, L., Niu, J., Xiang, L., (...), Zhang, X.-G., Coey, J.M.D., Symmetry-dependent electron-electron interaction in coherent tunnel junctions resolved by measurements of zero-bias anomaly, Physical Review B - Condensed Matter and Materials Physics, 90, 19, 2014, 195132- | en |
dc.identifier.other | Y | en |
dc.identifier.uri | http://hdl.handle.net/2262/73290 | |
dc.description | PUBLISHED | en |
dc.description.abstract | We provide conclusive experimental evidence that zero-bias anomaly in the differential resistance of magnetic tunnel junctions is due to electron-electron interaction (EEI), clarifying a longstanding issue. The magnon effect that caused confusion is now excluded by measuring at low temperatures down to 0.2 K and with reduced ac measurement voltages down to 0.06 mV. The normalized change of conductance is proportional to ln(eV/kBT), consistent with the Altshuler-Aronov theory of tunneling that describes the reduction of density of states due to EEI, but inconsistent with magnetic impurity scattering. The slope of the ln(eV/kBT) dependence is symmetry dependent: the slopes for parallel and antiparallel states are different for coherent tunnel junctions with symmetry filtering, while nearly the same for those without symmetry filtering (amorphous barriers). This observation may be helpful for verifying symmetry-preserved filtering in search of new coherent tunneling junctions, and for probing and separating electron Bloch states of different symmetries in other correlated systems. | en |
dc.description.sponsorship | We thank Fa Wang for helpful discussions, particularly about correlated systems. Work at Peking University was supported by National Basic Research Program of China (973 Program) through Grant No. 2011CBA00106 and No. 2012CB927400. Work at IOP, CAS was supported by the State Key Project of Fundamental Research of Ministry of Science and Technology [MOST, No. 2010CB934401, 2014AA032904] and National Natural Science Foundation of China [NSFC, Grant No. 11434014]. A portion of this research was conducted at the Center for Nanophase Materials Sciences, sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. | en |
dc.format.extent | 195132 | en |
dc.language.iso | en | en |
dc.relation.ispartofseries | Physical Review B - Condensed Matter and Materials Physics | en |
dc.relation.ispartofseries | 90 | en |
dc.relation.ispartofseries | 19 | en |
dc.rights | Y | en |
dc.subject | amorphous barriers | en |
dc.subject.lcsh | amorphous barriers | en |
dc.title | Symmetry-dependent electron-electron interaction in coherent tunnel junctions resolved by measurements of zero-bias anomaly | en |
dc.type | Journal Article | en |
dc.type.supercollection | scholarly_publications | en |
dc.type.supercollection | refereed_publications | en |
dc.identifier.peoplefinderurl | http://people.tcd.ie/jcoey | en |
dc.identifier.rssinternalid | 100898 | en |
dc.identifier.doi | http://dx.doi.org/10.1103/PhysRevB.90.195132 | en |
dc.rights.ecaccessrights | openAccess | |