Effect of the pressure-temperature history on Tc and the Hall coefficient in superconducting Tl2Ba2CuO6+x

Takahashi, Hiroki; Klehe, A.-K.; Looney, C.; Schilling, J. S.; Môri, N.; Shimakawa, Yuichi; Kubo, Yoshimi; Manako, T.

doi:10.1016/0921-4534(93)90807-3

Cited by 19 publications

(11 citation statements)

References 18 publications

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“…Sieburger and Schilling [33] measured for these systems Takahashi et al [36] analyzed the effect of pressure on T, for a sample with T, = 48 K at P = 0, applying pressure (O-O.6 GPa) both at room temperature and at 55 K. The results are very similar to those of Sieburger and Schilling [33].…”

Section: Calculationssupporting

confidence: 76%

“…The results are compared with experimental data by Sieburger and Schilling [33] and by Takahashi et al [36] with pressure applied (or changed) at r,+ 10K. /3 = 0.150 au-' leads to much less satisfactory agreement with experiment (Table 2).…”

Section: Calculationsmentioning

confidence: 82%

“…The value of dT,/dP was found to be about + 2 K/GPa, irrespective of the temperature at which pressure is applied. Expecting that such effects are not (or much less) important in Hg(N = l), results of the following analysis are compared with those of experiments [33,36] in which pressure was changed at low temperatures.…”

Section: The Systems Hg (N = I) and T12 (N = I) Under Pressurementioning

confidence: 99%

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Quantitative analysis of superconductivity in the Hg-cuprates. Comparison with the Tl2-series

Jansen

Block

1994

Physica A: Statistical Mechanics and its Applications

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Quantitative analysis of superconductivity in the Hg-cuprates. Comparison with the Tlabdasub2-series Jansen, L.; Block, R. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. reproduced, at the pressures observed. They are due to two-dimensional characteristics of superconductivity in these systems. The anomalous behavior of T,(P) in the Tl,(N) compounds with pressure applied at ambient temperature is found to result from pressure-induced diffusion of oxygen anions from the (Tl-O), bilayers towards the Cu02 layers. Neither van Hove singularities nor pressure-induced changes of the hole concentration in the CuO, layers are found to play a role in superconductivity of these compounds.

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Section: Calculationssupporting

confidence: 76%

Section: Calculationsmentioning

confidence: 82%

Section: The Systems Hg (N = I) and T12 (N = I) Under Pressurementioning

confidence: 99%

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Quantitative analysis of superconductivity in the Hg-cuprates. Comparison with the Tl2-series

Jansen

Block

1994

Physica A: Statistical Mechanics and its Applications

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“…Certainly not! The absence of relaxation phenomena in T c for optimally doped samples can be readily understood if the change in T c due to relaxation phenomena originates primarily from a change in the carrier concentration n in the CuO 2 plane(s); Hall effect studies on Tl-2201 support this conclusion [43]. In an optimally doped sample the value of T c is maximized as a function of n, i.e.…”

Section: B Relaxation Behavior At Ambient Pressurementioning

confidence: 52%

Relaxation effects in the transition temperature of superconductingHgBa2CuO4+δ

et al. 1999

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In previous studies on a number of under-and overdoped high temperature superconductors, including YBa 2 Cu 3 O 7−y and Tl 2 Ba 2 CuO 6+δ , the transition temperature T c has been found to change with time in a manner which depends on the sample's detailed temperature and pressure history. This relaxation behavior in T c is believed to originate from rearrangements within the oxygen sublattice. In the present high-pressure studies on HgBa 2 CuO 4+δ to 0.8 GPa we find clear evidence for weak relaxation effects in strongly underand overdoped samples (T c ≃ 40 -50 K) with an activation energy E A (1 bar) ≃ 0.8 -0.9 eV. For overdoped HgBa 2 CuO 4+δ E A increases under pressure more rapidly than previously observed for YBa 2 Cu 3 O 6.41 , yielding an activation volume of +11 ± 5 cm 3 ; the dependence of T c on pressure is markedly nonlinear, an anomalous result for high-T c superconductors in the present pressure range, giving evidence for a change in the electronic and/or structural properties near 0.4 GPa.2

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“…Early results from electron diffraction [72] showed the appearance of oxygen ordering in the CuO chains, which was investigated in detail via quench experiments [73,74]. An influence of pressure on oxygen ordering was found for the Tl221 compound at temperatures even below 40 K [75][76][77][78][79]. Similar processes were seen for Y123 [69,[80][81][82][83][84][85] but in contrast to Tl221 it was shown by T c (p) determinations that the oxygen ordering effect was absent at temperatures below 240 K [80].…”

Section: Introductionmentioning

confidence: 99%

The effect of chemical doping and hydrostatic pressure on Tc of Y1−yCayBa2Cu3Ox single crystals

Schlachter

Fietz²,

Grube³

et al. 1999

Physica C: Superconductivity

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We performed susceptibility measurements on Y 1-y Ca y Ba 2 Cu 3 O x single crystals under high He pressure. For each Ca content various samples with different oxygen contents have been prepared to probe the influence of Ca on T c (x), dT c /dp(x) and T c,max . Starting from the parabolic T c (n h ) behavior we calculated n h values from T c and T c,max for each sample. It is shown that in the overdoped region dT c /dp can be described by a pressure induced charge transfer with dn h /dp ≈ 3.7⋅10 -3 GPa -1 and a dT c,max /dp value of 0.8 K/GPa, irrespective of the Ca content. In the underdoped region additional pressure effects lead to a peak in dT c /dp at ≈0.11 holes/CuO 2 plane. However, with increasing Ca content this peak is strongly depressed. This is explained in terms of an increasing disorder in the CuO chain system due to doping. Deviations in dT c /dp at very low n h values can be assigned to the ortho II ordering in the CuO chain system.

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Effect of the pressure-temperature history on Tc and the Hall coefficient in superconducting Tl2Ba2CuO6+x

Cited by 19 publications

References 18 publications

Quantitative analysis of superconductivity in the Hg-cuprates. Comparison with the Tl2-series

Quantitative analysis of superconductivity in the Hg-cuprates. Comparison with the Tl2-series

Relaxation effects in the transition temperature of superconductingHgBa2CuO4+δ

The effect of chemical doping and hydrostatic pressure on Tc of Y1−yCayBa2Cu3Ox single crystals

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