TY - JOUR
T1 - Magnetization distribution in the mixed-phase state of hole-doped manganites
AU - Murakami, Y.
AU - Yoo, J. H.
AU - Shindo, D.
AU - Atou, T.
AU - Kikuchi, M.
N1 - Funding Information:
Acknowledgements We thank T. Ohsuna and Y. Gao for discussions. This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture of Japan, and by the Special Coordination Funds for Promoting Science and Technology of ‘Nanohetero Metallic Materials’ from the Science and Technology Agency.
Funding Information:
Acknowledgements We thank the officers and crews of PFS Polarstern and USCGC Healy for their technical and logistical support, and the helicopter teams and all the members of the AMORE scientific party for their efforts. This work was supported by the Deutsche Forschungsgemeinschaft and the U.S. National Science Foundation.
PY - 2003/6/26
Y1 - 2003/6/26
N2 - The effect of 'colossal magnetoresistance' (CMR) in hole-doped manganites - an abnormal decrease of resistivity when a magnetic field is applied - has attracted significant interest from researchers in the past decade. But the underlying mechanism for the CMR phenomenon is not yet fully understood. It has become clear that a phase-separated state, where magnetic and nonmagnetic phases coexist, is important, but the detailed magnetic microstructure of this mixed-phase state is so far unclear. Here we use electron microscopy to study the magnetic microstructure and development of ferromagnetic domains in the mixed-phase state of La1-xSrxMnO3 (x = 0.54, 0.56). Our measurements show that, in the absence of a magnetic field, the magnetic flux is closed within ferromagnetic regions, indicating a negligible magnetic interaction between separated ferromagnetic domains. However, we also find that the domains start to combine with only very small changes in temperature. We propose that the delicate nature of the magnetic microstructure in the mixed-phase state of hole-doped manganites is responsible for the CMR effect, in which significant conduction paths form between the ferromagnetic domains upon application of a magnetic field.
AB - The effect of 'colossal magnetoresistance' (CMR) in hole-doped manganites - an abnormal decrease of resistivity when a magnetic field is applied - has attracted significant interest from researchers in the past decade. But the underlying mechanism for the CMR phenomenon is not yet fully understood. It has become clear that a phase-separated state, where magnetic and nonmagnetic phases coexist, is important, but the detailed magnetic microstructure of this mixed-phase state is so far unclear. Here we use electron microscopy to study the magnetic microstructure and development of ferromagnetic domains in the mixed-phase state of La1-xSrxMnO3 (x = 0.54, 0.56). Our measurements show that, in the absence of a magnetic field, the magnetic flux is closed within ferromagnetic regions, indicating a negligible magnetic interaction between separated ferromagnetic domains. However, we also find that the domains start to combine with only very small changes in temperature. We propose that the delicate nature of the magnetic microstructure in the mixed-phase state of hole-doped manganites is responsible for the CMR effect, in which significant conduction paths form between the ferromagnetic domains upon application of a magnetic field.
UR - https://www.scopus.com/pages/publications/0038789060
UR - https://www.scopus.com/pages/publications/0038789060#tab=citedBy
U2 - 10.1038/nature01715
DO - 10.1038/nature01715
M3 - Article
C2 - 12827195
AN - SCOPUS:0038789060
SN - 0028-0836
VL - 423
SP - 965
EP - 968
JO - Nature
JF - Nature
IS - 6943
ER -