Transport properties of high-T c cuprate thin films as superconductive materials

Vanacken, Johan; Moshchalkov, Victor

doi:10.1533/9780857091031.1.38

Cited by 1 publication

(2 citation statements)

References 123 publications

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“…This suggests that the substantial increase in positive MR below 80 K could be related to the onset of superconductivity in WO2.9. We note that a considerable positive MR with unusual temperature dependence was reported recently in strongly underdoped La2−xSrxCuO4 thin films [35]. For example, in a sample where x = 0.05, a magnetic field of 45 T caused an excess resistivity of 10% at a temperature of 10 K. With increasing temperature, the MR decreased to a constant value of ~2% around 40 K. This temperature corresponds to the maximum Tc observed in optimally doped La2−xSrxCuO4.…”

Section: Resultssupporting

confidence: 76%

“…For example, in a sample where x = 0.05, a magnetic field of 45 T caused an excess resistivity of 10% at a temperature of 10 K. With increasing temperature, the MR decreased to a constant value of ~2% around 40 K. This temperature corresponds to the maximum Tc observed in optimally doped La2−xSrxCuO4. Notably, the sample with x = 0.05 did not show signatures of superconductivity in resistivity measurements down to 1.5 K. The considerable excess positive MR observed at low temperatures, which depends non-quadratically on the magnetic field, was attributed to superconducting fluctuations in underdoped La2−xSrxCuO4 [35]. Magnetic field suppresses superconducting fluctuations, leading to an enhanced resistivity.…”

Section: Resultsmentioning

confidence: 90%

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Unconventional Transport Properties of Reduced Tungsten Oxide WO2.9

2020

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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.

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Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 90%