Low-frequency noise in charge-ordered system Pr0.63Ca0.37MnO3 near the charge-ordering transition and in the current-induced destabilized state

Aveek Bid; Arup Kumar Raychaudhuri

doi:10.1117/12.497030

9 May 2003 Low-frequency noise in charge ordered system Pr_0.63Ca_0.37MnO₃ near the charge-ordering transition and in the current induced destabilized state

Aveek Bid, Arup Kumar Raychaudhuri

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Proceedings Volume 5112, Noise as a Tool for Studying Materials; (2003) https://doi.org/10.1117/12.497030
Event: SPIE's First International Symposium on Fluctuations and Noise, 2003, Santa Fe, New Mexico, United States

Abstract

We have investigated the dynamics of co-existing phases in the Charge Ordered (CO) manganite Pr_0.63Ca_0.37MnO₃ using the technique of conductance noise spectroscopy. We note that close to the CO transition temperature T_co the spectral power of S_v(f)/V² deviates significantly from the 1/f frequency dependence for f≤0.12Hz. Our analysis shows that this deviation can be described by a single frequency Lorentzian with corner frequency f_c in addition to the usual broadband 1/f noise. Such a Lorentzian contribution to S_v(f)/V² can come from a two level system (TLS). In the time serioues this shows up as RTN. For T≤T_co the system shows the onset of a non-linear conduction close to a threshold value J_dc = J_th the noise spectra is mainly 1/f in nature. For J > J_th a large low frequency component of noise (characterized again by a frequency f_c) appears. We associate f_c with the relaxation time tc of the TLS fluctuator so the tc = 1/f_c. For thermal activation of the TLS the temperature dependence of f_c will follow f_c=f_oexp(-E_a/k_BT) where E_a is an energy barrier. The value of f_c shows an increase with J_dc showing that the value of the activation energy E_a is being lowered by the applied bias.

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Aveek Bid and Arup Kumar Raychaudhuri "Low-frequency noise in charge ordered system Pr_0.63Ca_0.37MnO₃ near the charge-ordering transition and in the current induced destabilized state", Proc. SPIE 5112, Noise as a Tool for Studying Materials, (9 May 2003); https://doi.org/10.1117/12.497030

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Resistance

Temperature metrology

Spectroscopy

Picosecond phenomena

Amplifiers

Carbon monoxide

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