A model for the “quasi” 60 K plateau in the YBa2Cu3O6+ high-T compound

Matić, V.M.; Lazarov, N.Dj.; Milić, M.

doi:10.1016/j.jallcom.2012.10.047

Cited by 3 publications

(3 citation statements)

References 19 publications

(54 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High temperature superconductivity [1] with a maximum T c of 92 K in YBCO [2,3] is strongly influenced by the oxygen deficiency δ and the order of oxygen atoms (see e. g. refs. [4][5][6]). Both, the deeper understanding of the T c (δ) dependence and the precise adjustment of T c require information about the oxygen vacancies on a microscopic level.…”

mentioning

confidence: 99%

Detection and imaging of the oxygen deficiency in single crystalline YBa2Cu3O7−δ thin films using a scanning positron beam

Reiner

Gigl

Jany

et al. 2015

Applied Physics Letters

View full text Add to dashboard Cite

Single crystalline YBa2Cu3O 7−δ (YBCO) thin films were grown by pulsed laser deposition (PLD) in order to probe the oxygen deficiency δ using a mono-energetic positron beam. The sample set covered a large range of δ (0.191<δ<0.791) yielding a variation of the critical temperature Tc between 25 and 90 K. We found a linear correlation between the Doppler broadening of the positron electron annihilation line and δ determined by X-ray diffraction (XRD). Both, the origin of the found correlation and the influence of metallic vacancies, were examined with the aid of ab-initio calculations that allowed us (i) to exclude the presence of Y vacancies and (ii) to ensure that positrons still probe δ despite the potential presence of Ba or Cu vacancies. In addition, by scanning with the positron beam the spatial variation of δ could be analyzed. It was found to fluctuate with a standard deviation of up to 0.079(5) within a single YBCO film.

show abstract

mentioning

confidence: 99%

Detection and imaging of the oxygen deficiency in single crystalline YBa2Cu3O7−δ thin films using a scanning positron beam

Reiner

Gigl

Jany

et al. 2015

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

“…The depth dependence found for δ(z) implies a depth variation of the critical temperature T c since it is directly correlated to the oxygen deficiency δ. [29][30][31] The T c (z) behaviour can hence be derived by interpolating the values determined by measurements on reference samples. As expected for the as prepared state, T c (z) changes only slightly since δ covers mostly a range where T c (δ) ≈ 90 K, and becomes lower near the YBCO/STO interface (see fig.…”

Section: Discussionmentioning

confidence: 99%

Impact of oxygen diffusion on superconductivity in YBa2Cu3O7−δ thin films studied by positron annihilation spectroscopy

et al. 2018

View full text Add to dashboard Cite

The oxygen deficiency δ in YBa2Cu3O 7−δ (YBCO) plays a crucial role for affecting hightemperature superconductivity. We applied (coincident) Doppler broadening spectroscopy of the electron-positron annihilation line to study in situ the temperature dependence of the oxygen concentration and its depth profile in single crystalline YBCO film grown on SrTiO3 (STO) substrates. The oxygen diffusion during tempering was found to lead to a distinct depth dependence of δ, which is not accessible using X-ray diffraction. A steady-state reached within a few minutes is defined by both, the oxygen exchange at the surface and at the interface to the STO substrate. Moreover, we revealed the depth dependent critical temperature Tc in the as prepared and tempered YBCO film.

show abstract

“…Until this point we have considered experimental ndings on the T c (P ) behavior when the pressure is applied at temperatures low enough to prevent oxygen reordering in the oxygen decient CuO x planes. However if the pressure is applied at higher temperatures it will enable movements of oxygen atoms and their ordering into longer CuO chains which are known to be better hole dopants than the short ones (only CuO chains longer than 3 or 4 oxygen atoms can transfer holes) [28,29]. This will inevitably have consequences on T c behavior with pressure.…”

Section: Theoretical Modelmentioning

confidence: 99%

Theoretical Study on the Pressure Induced T_c Change in YBa_2Cu_3O_x

Milić

2013

Acta Phys. Pol. A

View full text Add to dashboard Cite

Pressure eect on the critical temperature, Tc, of the YBa2Cu3Ox superconductor was considered in the frame of a simple theoretical model which as a starting point assumes that Tc vs. pressure, P , dependence can be described by an inverted parabola. Available experimental results on Tc behavior under pressure were analyzed as a function of the zero pressure hole concentration in the superconducting CuO2 planes, n h (P = 0 GPa)= n h0 , for dierent constant values of P . Maximum Tc that can be achieved under pressure was estimated and discussed in relation to the n h0 = 1/8 doping and establishment of charge and spin order. The results obtained here were used to estimate increase of the hole concentration in the CuO2 planes which occurs as a result of pressure induced oxygen reordering.

show abstract

A model for the “quasi” 60 K plateau in the YBa2Cu3O6+ high-T compound

Cited by 3 publications

References 19 publications

Detection and imaging of the oxygen deficiency in single crystalline YBa2Cu3O7−δ thin films using a scanning positron beam

Detection and imaging of the oxygen deficiency in single crystalline YBa2Cu3O7−δ thin films using a scanning positron beam

Impact of oxygen diffusion on superconductivity in YBa2Cu3O7−δ thin films studied by positron annihilation spectroscopy

Theoretical Study on the Pressure Induced T_c Change in YBa_2Cu_3O_x

Contact Info

Product

Resources

About