Effect of reduction on the optical properties of Sr0.61Ba0.39Nb2O6 single crystals grown by optical floating zone technique

Bhatt, R.; Soharab, M.; Bhaumik, Indranil; Verma, Prabhat; Sajith, B.K.; Saxena, A.; Karnal, A.K.

doi:10.1016/j.jallcom.2019.151818

Cited by 1 publication

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“…The solid solution strontium barium niobate (Sr 1−x Ba x Nb 2 O 6 , SBN) constitutes a fascinating material system, exhibiting a plethora of functional properties. These are highly sensitive to a number of internal (exact chemical composition, i.e., the value of x; doping by rare earth and/or transition metal ions [1], variation of oxygen content [2]) and external (electric, photonic, strain fields) stimuli and thus being effectively tunable for potential applications. In fact, the compound, which crystallizes in the tetragonal tungsten bronze (TTB) structure for 0.25 < x < 0.8 [3], has attracted a great deal of interest of different scientific communities within physics, chemistry, and materials research.…”

Section: Introductionmentioning

confidence: 99%

“…In all cases shown in Figure 4, we continued to record the resistance after having turned off the illumination. The resulting "light-off" transients obtained with the normalization of Equation ( 1), which reveal the relaxation behavior of the photoexcited carriers, are depicted for the first ten minutes in Figure S5, while Figure 6 shows the recovery behavior according to Equation (2). The majority of the transients in Figure S5 show a clear trend: a fast initial decay followed by a slow relaxation component, with none of the transients reaching zero PC, i.e., the initial dark resistance, within the time span considered here.…”

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confidence: 99%

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Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals

et al. 2021

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In the last two decades, variably doped strontium barium niobate (SBN) has attracted a lot of scientific interest mainly due to its specific non-linear optical response. Comparably, the parental compound, i.e., undoped SBN, appears to be less studied so far. Here, two different cuts of single-crystalline nominally pure strontium barium niobate in the composition Sr0.61Ba0.39Nb2O6 (SBN61) are comprehensively studied and analyzed with regard to their photoconductive responses. We present conductance measurements under systematically varied illumination conditions along either the polar z-axis or perpendicular to it (x-cut). Apart from a pronounced photoconductance (PC) already under daylight and a large effect upon super-bandgap illumination in general, we observe (i) distinct spectral features when sweeping the excitation wavelength over the sub-bandgap region as then discussed in the context of deep and shallow trap states, (ii) extremely slow long-term relaxation for both light-on and light-off transients in the range of hours and days, (iii) a critical dependence of the photoresponse on the pre-illumination history of the sample, and (iv) a current–voltage hysteresis depending on both the illumination and the electrical-measurement conditions in a complex manner.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%