Scaling of THz-conductivity at metal-insulator transition in doped manganites

Magnetic field and temperature dependence of the Terahertz conductivity and permittivity of the colossal magnetoresistance manganite Pr_{0.65}Ca_{0.28}Sr_{0.07}MnO_3 (PCSMO) is investigated approaching the metal-to-insulator transition (MIT) from the insulating side. In the charge-ordered state of P...

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Bibliographic Details
Published in:arXiv.org 2006-05
Main Authors: Pimenov, A, Biberacher, M, Ivannikov, D, Loidl, A, Mukhin, A A, Goncharov, Yu G, Balbashov, A M
Format: Article
Language:English
Subjects:
Calcium
Colossal magnetoresistance
Conductivity
Insulators
Magnetic fields
Magnetoresistance
Magnetoresistivity
Manganites
Metal-insulator transition
Permittivity
Scaling
Strontium
Temperature dependence
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Summary:Magnetic field and temperature dependence of the Terahertz conductivity and permittivity of the colossal magnetoresistance manganite Pr_{0.65}Ca_{0.28}Sr_{0.07}MnO_3 (PCSMO) is investigated approaching the metal-to-insulator transition (MIT) from the insulating side. In the charge-ordered state of PCSMO both conductivity and dielectric permittivity increase as function of magnetic field and temperature. Universal scaling relationships between the changes in permittivity and conductivity are observed in a broad range of temperatures and magnetic fields. Similar scaling is also seen in La_{1-x}Sr_xMnO_3 for different doping levels. The observed proportionality points towards the importance of pure ac-conductivity and phononic energy scale at MIT in manganites.
ISSN:2331-8422
DOI:10.48550/arxiv.0605146