Influence of substrate on the excess electrical noise in the normal state of YBa2Cu3O7-? thin films

Rajeswari, M.; Lakeou, S.; Wood, Esther; Choughule, D.D.; Venkatesan, T.; Harshavardhan, K. S.; Shi, Zhenzhong

doi:10.1007/bf00727553

Cited by 6 publications

(4 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9 For noise measurements, 200 nm thick films were patterned into 125 m wide and 2 mm long bridges in the 4-probe configuration with evaporated silver as contact pads and soldered gold wires as leads. -2 measurements indicate ͑100͒ oriented single phase material.…”

mentioning

confidence: 99%

1/f electrical noise in epitaxial thin films of the manganite oxides La0.67Ca0.33MnO3 and Pr0.67Sr0.33MnO3

Rajeswari

Goyal

Raychaudhuri

et al. 1996

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

We report measurements of 1/f electrical noise in two hole doped manganite perovskite oxides, La 0.67 Ca 0.33 MnO 3 and Pr 0.67 Sr 0.33 MnO 3 , which exhibit colossal magnetoresistance. The noise magnitude represented by the Hooge parameter is nearly 8 orders of magnitude larger than that observed in ordinary metals ͑and semiconductors͒ and nearly 5-6 orders of magnitude larger than that observed in epitaxial films of the perovskite oxide YBa 2 Cu 3 O 7 in the normal state. The normalized noise spectral density increases with decreasing temperature below the resistivity peak, suggestive of the presence of additional low energy noise processes in the ferromagnetic metallic state.

show abstract

mentioning

confidence: 99%

1/f electrical noise in epitaxial thin films of the manganite oxides La0.67Ca0.33MnO3 and Pr0.67Sr0.33MnO3

Rajeswari

Goyal

Raychaudhuri

et al. 1996

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…The most thorough investigation of noise amongst oxides has been carried out only on hightemperature superconducting cuprates like YBa 2 Cu 3 O 7−δ . In these oxides the conductivity noise often has a very high magnitude [3][4][5][6][7][8]. Recent work on the normal state of cuprates has established that the noise depends strongly on factors like oxygen stoichiometry (δ), the extent of epitaxy, the lattice mismatch with the substrate etc.…”

mentioning

confidence: 99%

Dependence of the conductivity noise of metallic oxide interconnects on the oxygen stoichiometry: a study of

Ghosh

Raychaudhuri

Sreekala

et al. 1997

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

We report measurements of low-frequency conductivity noise over the temperature range 4.2 - 400 K in epitaxial thin films of which is a potential material for metallic oxide interconnects. The observed spectral power of the noise has a frequency spectrum where , and it depends strongly on the temperature as well as on the oxygen stoichiometry, . Contrary to expectations, we made the interesting observation that the magnitude of the noise at room temperature does not increase monotonically with the oxygen deficiency . Instead it shows a minimum at certain non-zero values of unlike the resistivity which is minimum at .

show abstract

“…Thin YBCO and Ca-YBCO films (30-35 nm) were grown by pulsed laser deposition. Except for one film grown on a vicinal SrTiO 3 (001) (STO) substrate to reduce twinning [32], LaAlO 3 (LAO) substrates were chosen for their lower low-frequency noise [33]. The films were first nearly optimally doped, then annealed in low O 2 pressure to obtain 30 K < T c < 85 K corresponding to 0:65 > > 0:3.…”

mentioning

confidence: 99%

Anomalous Noise in the Pseudogap Regime ofYBa2Cu3O7−δ

et al. 2010

View full text Add to dashboard Cite

An unusual noise component is found near and below about 250 K in the normal state of underdoped YBCO and Ca-YBCO films. This noise regime, unlike the more typical noise above 250 K, has features expected for a symmetry-breaking collective electronic state. These include large individual fluctuators, a magnetic sensitivity, and aging effects. A possible interpretation in terms of fluctuating charge nematic order is presented.

show abstract

Influence of substrate on the excess electrical noise in the normal state of YBa2Cu3O7-? thin films

Cited by 6 publications

References 8 publications

1/f electrical noise in epitaxial thin films of the manganite oxides La0.67Ca0.33MnO3 and Pr0.67Sr0.33MnO3

1/f electrical noise in epitaxial thin films of the manganite oxides La0.67Ca0.33MnO3 and Pr0.67Sr0.33MnO3

Dependence of the conductivity noise of metallic oxide interconnects on the oxygen stoichiometry: a study of

Anomalous Noise in the Pseudogap Regime ofYBa2Cu3O7−δ

Contact Info

Product

Resources

About