RT Journal Article
T1 Magnon-mediated magnetoresistance in layered manganites
A1 Hernando Grande, Antonio
A1 Cortés Gil, Raquel
A1 González Merchante, Daniel
A1 Hernando González, María
A1 Alonso Rodríguez, José María
A1 García García Tuñón, Miguel Ángel
A1 Martínez, José L.
A1 Ruiz Gonález, María Luisa
A1 González Calbet, José María
AB We describe here a type of magnetoresistance that takes place in naturally layered and outstanding ordered single phase manganites that may be mediated by magnon excitation. In particular, we show the effect for the Ruddlesden-Popper compound, LaSr2Mn2O7 synthesized by ceramic method. This material exhibits, besides the conventional colossal magnetoresistance, another type of magnetoresistance at low temperature, associated with breaking of the A-type antiferromagnetic coupling of Mn-containing planes. Excitation of magnons or application of a magnetic field breaks this antiparallel alignment so that some electrons, initially confined on the planes, become itinerant along the interplain directions through a double exchange mechanism, giving rise to resistance variations of the order of similar to 60% for polycrystalline samples. The effect described here might be present in other types of manganites exhibiting a natural layered structure, opening up the possibility of developing magnetoresistive devices based on antiferromagnetic oxide materials without requiring artificial multilayered structures.
PB American Physical Society
SN 2469-9950
YR 2019
FD 2019-01-03
LK https://hdl.handle.net/20.500.14352/13075
UL https://hdl.handle.net/20.500.14352/13075
LA eng
NO ©2019 American Physical Society This work was supported by the Spanish Ministry of Innovation, Science, and Technology and the Spanish Ministry of Economy and Competitiveness through Research Projects No. CSD2009-00013, No. TSI-020100-2011-280, No. MAT2011-23068, No. MAT2012-37109-C02-01, No. MAT2014-54372-R, and No. MAT2017-86450-C04-R.
NO Ministerio de Economia y Competitividad (MINECO)
DS Docta Complutense
RD 6 oct 2024