Abstract
Measurements of the low-frequency (f≤100 kHz) permittivity (ε) and conductivity (σ) at T≲150 K are reported for La1-xCa xMnO3 (0≤x≤1) and Ca1-ySr yMnO3 (0≤y≤0.75) having antiferromagnetic, insulating ground states covering a broad range of Mn valencies from Mn 3+ to Mn4+. Static dielectric constants are determined from the low-T limiting behavior. With increasing T, relaxation peaks associated with charge-carrier hopping are observed in the real part of the permittivities and analyzed to determine dopant binding energies. The data are consistent with a simple model of hydrogenic impurity levels and imply effective masses m*/me∼3 for the Mn4+ compounds. Particularly interesting is a large dielectric constant (ε0∼100) associated with the C-type antiferromagnetic state near the composition La 0.2Ca0.8MnO3.
| Original language | English (US) |
|---|---|
| Article number | 214433 |
| Pages (from-to) | 1-6 |
| Number of pages | 6 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 70 |
| Issue number | 21 |
| DOIs | |
| State | Published - Dec 2004 |
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ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Low-temperature permittivity of insulating perovskite manganites. / Cohn, Joshua; Peterca, M.; Neumeier, J. J.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 70, No. 21, 214433, 12.2004, p. 1-6.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Low-temperature permittivity of insulating perovskite manganites
AU - Cohn, Joshua
AU - Peterca, M.
AU - Neumeier, J. J.
PY - 2004/12
Y1 - 2004/12
N2 - Measurements of the low-frequency (f≤100 kHz) permittivity (ε) and conductivity (σ) at T≲150 K are reported for La1-xCa xMnO3 (0≤x≤1) and Ca1-ySr yMnO3 (0≤y≤0.75) having antiferromagnetic, insulating ground states covering a broad range of Mn valencies from Mn 3+ to Mn4+. Static dielectric constants are determined from the low-T limiting behavior. With increasing T, relaxation peaks associated with charge-carrier hopping are observed in the real part of the permittivities and analyzed to determine dopant binding energies. The data are consistent with a simple model of hydrogenic impurity levels and imply effective masses m*/me∼3 for the Mn4+ compounds. Particularly interesting is a large dielectric constant (ε0∼100) associated with the C-type antiferromagnetic state near the composition La 0.2Ca0.8MnO3.
AB - Measurements of the low-frequency (f≤100 kHz) permittivity (ε) and conductivity (σ) at T≲150 K are reported for La1-xCa xMnO3 (0≤x≤1) and Ca1-ySr yMnO3 (0≤y≤0.75) having antiferromagnetic, insulating ground states covering a broad range of Mn valencies from Mn 3+ to Mn4+. Static dielectric constants are determined from the low-T limiting behavior. With increasing T, relaxation peaks associated with charge-carrier hopping are observed in the real part of the permittivities and analyzed to determine dopant binding energies. The data are consistent with a simple model of hydrogenic impurity levels and imply effective masses m*/me∼3 for the Mn4+ compounds. Particularly interesting is a large dielectric constant (ε0∼100) associated with the C-type antiferromagnetic state near the composition La 0.2Ca0.8MnO3.
UR - http://www.scopus.com/inward/record.url?scp=13744258556&partnerID=8YFLogxK
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U2 - 10.1103/PhysRevB.70.214433
DO - 10.1103/PhysRevB.70.214433
M3 - Article
AN - SCOPUS:13744258556
VL - 70
SP - 1
EP - 6
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 21
M1 - 214433
ER -