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

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arxiv cond-mat/0605146 v1 pith:KFDFZOPF submitted 2006-05-05 cond-mat.str-el cond-mat.mtrl-sci

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

A. Pimenov , M. Biberacher , D. Ivannikov , A. Loidl , A. A. Mukhin , Yu. G. Goncharov , A. M. Balbashov This is my paper
classification cond-mat.str-el cond-mat.mtrl-sci
keywords conductivitymagneticpermittivityscalingfieldmanganitesobservedpcsmo
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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