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Open AccessArticle

Unconventional Transport Properties of Reduced Tungsten Oxide WO2.9

1
Department of Physics, Ivane Javakhishvili Tbilisi State University, Chavchavadze 3, GE-0128 Tbilisi, Georgia
2
Andronikashvili Institute of Physics, Ivane Javakhishvili Tbilisi State University, 0177 Tbilisi, Georgia
3
Laboratory for Transport at Nanoscale Interfaces, Empa Swiss Federal Laboratories for Science and Technology, 8600 Dübendorf, Switzerland
4
Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
*
Author to whom correspondence should be addressed.
Condens. Matter 2020, 5(4), 63; https://doi.org/10.3390/condmat5040063
Received: 12 September 2020 / Revised: 14 October 2020 / Accepted: 14 October 2020 / Published: 16 October 2020
The temperature and magnetic field dependence of resistivity in WO2.9 was investigated. The variation of resistivity with temperature displayed unusual features, such as a broad maximum around 230 K and a logarithmic increase of resistivity below 16 K. In the temperature range 16–230 K, we observed metallic-like behavior with a positive temperature coefficient. The combined analysis of resistivity and magnetoresistance (MR) data shows that these unusual transport properties of WO2.9 can be understood by considering the (bi)polaronic nature of charge carriers. In contrast to magnetization data, superconducting transition below Tc = 80 K was not detected in resistivity measurements, indicating that the superconductivity is localized in small regions that do not percolate. We found a strong increase in positive MR below 80 K. This effect is similar to that observed in underdoped cuprates, where the substantial increase of MR is attributed to superconducting fluctuations in small clusters. Therefore, the temperature dependence of MR indicates the presence of non-percolating superconducting clusters in WO2.9 below 80 K in agreement with magnetization data. View Full-Text
Keywords: tungsten oxide; polarons; superconductivity tungsten oxide; polarons; superconductivity
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MDPI and ACS Style

Shengelaya, A.; Mattina, F.L.; Conder, K. Unconventional Transport Properties of Reduced Tungsten Oxide WO2.9. Condens. Matter 2020, 5, 63.

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