1999
DOI: 10.1103/physrevb.60.1028
|View full text |Cite
|
Sign up to set email alerts
|

Coexistence of localized and itinerant carriers nearTCin calcium-doped manganites

Abstract: We explore the possibility that polaronic distortions in the paramagnetic phase of La 0.67 Ca 0.33 MnO 3 manganites persist in the ferromagnetic phase by considering the observed electrical resistivity to arise from coexisting fieldand temperature-dependent polaronic and band-electron fractions. We use an effective medium approach to compute the total resistivity of the twocomponent system, and find that a limit with low percolation treshold explains the data rather well. To test the validity of this model, we… Show more

Help me understand this report
View preprint versions

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1

Citation Types

15
103
2
4

Year Published

1999
1999
2022
2022

Publication Types

Select...
6
2
1

Relationship

1
8

Authors

Journals

citations
Cited by 182 publications
(124 citation statements)
references
References 36 publications
15
103
2
4
Order By: Relevance
“…This description of the electron phonon coupling appears even more inappropriate for LSMO, which has different valence states, carrier concentration, and nonspherical Fermi surface [23]. When applied [24][25][26][27][28], this approach gave unrealistic values for the T 5 coefficient, which is found to be one to two orders of magnitude lower than in metals [29,30]. These findings are in obvious contradiction with the strong electronphonon coupling, known to govern the physics of manganites [6,12,18,[31][32][33][34][35].…”
contrasting
confidence: 50%
“…This description of the electron phonon coupling appears even more inappropriate for LSMO, which has different valence states, carrier concentration, and nonspherical Fermi surface [23]. When applied [24][25][26][27][28], this approach gave unrealistic values for the T 5 coefficient, which is found to be one to two orders of magnitude lower than in metals [29,30]. These findings are in obvious contradiction with the strong electronphonon coupling, known to govern the physics of manganites [6,12,18,[31][32][33][34][35].…”
contrasting
confidence: 50%
“…From h xs we obtain the proportion of the sample in the delocalized phase, cH; T , referred to as the "mixing factor" in Ref. [36]. Jaime et al [36] make a prediction for the field and temperature dependence of cH; T , reproduced in Fig.…”
Section: Evolution Of Polarons With T and Xmentioning
confidence: 99%
“…[36]. Jaime et al [36] make a prediction for the field and temperature dependence of cH; T , reproduced in Fig. 5, from their phenomenological model.…”
Section: Evolution Of Polarons With T and Xmentioning
confidence: 99%
“…In this temperature range, the tangent of the Hall angle, ρ xy /ρ xy is found be remarkably linear in the measured magnetization, despite 300 % changes in the longitudinal resistivity. As it seems unlikely that the skew-scattering mechanism continues to operate in the hopping regime, we consider another approach in which the observed conductivity is assumed to be a field-and temperature-dependent admixture of band-like and polaronic charge carriers, conducting in parallel 10 . This approach also provides a very good representation of the data, but the polaronic Hall constant that emerges increases more rapidly as the temperature approaches T C than is expected from conventional polaron theory.…”
mentioning
confidence: 99%