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Electronic phase separation in lanthanum manganites: Evidence from 55 Mn NMR

Electronic phase separation in lanthanum manganites: Evidence from 55 Mn NMR 55 Mn NMR experiments were carried out at 1.3–4.2 K on six samples of lanthanum manganites, with a hole doping concentration ranging from the antiferromagnetic-insulator to the ferromagnetic-conductor region of the phase diagram. The dependence of the resonance frequencies on external fields is either as expected for ferromagnets (FM) or for antiferromagnets (AF). No indication of a canted phase could be detected. FM and AF resonances were found to coexist in all samples and are grouped in three broad bands, whose frequencies do not depend in first order on hole concentration. Strong evidence of interaction between AF and FM regions was provided by longitudinal relaxation experiments in several samples. An explanation of this behavior is offered in terms of intrinsic phase separation of the holes into FM microdomains. We determine the 55 Mn hyperfine coupling to be isotropic in all cases, with A = 6.2 T / μ B for the on-site term in the AF domains. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Electronic phase separation in lanthanum manganites: Evidence from 55 Mn NMR

Physical Review B , Volume 56 (10) – Sep 1, 1997
11 pages

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References (1)

Publisher
American Physical Society (APS)
Copyright
Copyright © 1997 The American Physical Society
ISSN
1095-3795
DOI
10.1103/PhysRevB.56.6036
Publisher site
See Article on Publisher Site

Abstract

55 Mn NMR experiments were carried out at 1.3–4.2 K on six samples of lanthanum manganites, with a hole doping concentration ranging from the antiferromagnetic-insulator to the ferromagnetic-conductor region of the phase diagram. The dependence of the resonance frequencies on external fields is either as expected for ferromagnets (FM) or for antiferromagnets (AF). No indication of a canted phase could be detected. FM and AF resonances were found to coexist in all samples and are grouped in three broad bands, whose frequencies do not depend in first order on hole concentration. Strong evidence of interaction between AF and FM regions was provided by longitudinal relaxation experiments in several samples. An explanation of this behavior is offered in terms of intrinsic phase separation of the holes into FM microdomains. We determine the 55 Mn hyperfine coupling to be isotropic in all cases, with A = 6.2 T / μ B for the on-site term in the AF domains.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Sep 1, 1997

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