Giant pressure effect in oxygen deficient YBa2Cu3Ox

Fietz, W.H.; Quenzel, R.; Ludwig, H.; Grube, K.; Schlachter, S.I.; Hornung, F.; Wolf, Th.; Erb, A.; Kläser, M.; Müller‐Vogt, G.

doi:10.1016/s0921-4534(96)00480-7

Cited by 63 publications

(44 citation statements)

References 26 publications

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“…3, yielding E A (1 bar) ≃ 0.84 eV and 0.90 eV, respectively. These values are quite comparable to each other and to activation energies determined from relaxation studies on Y-123 (0.97 eV) [14,16], Tl-2201 (0.72 eV) [23] and Tl-1212 (0.86 eV) [17], as well as to oxygen tracer diffusion studies on Y-123 and other oxide superconductors [41]. This fact, and the known sensitivity of the relaxation behavior to the oxygen content [13,16], make it likely that the above relaxation effects originate in the oxygen sublattice.…”

Section: B Relaxation Behavior At Ambient Pressuresupporting

confidence: 80%

“…These values are quite comparable to each other and to activation energies determined from relaxation studies on Y-123 (0.97 eV) [14,16], Tl-2201 (0.72 eV) [23] and Tl-1212 (0.86 eV) [17], as well as to oxygen tracer diffusion studies on Y-123 and other oxide superconductors [41]. This fact, and the known sensitivity of the relaxation behavior to the oxygen content [13,16], make it likely that the above relaxation effects originate in the oxygen sublattice. To our knowledge, no attempt has yet been made to compute the energy barrier for oxygen diffusion in Hg-1201; in a recent model calculation Islam and Winch [42] have estimated E A (1 bar) ≈ 0.68 eV for the migration of interstitial O(4) oxygen in the three-layer compound Hg-1223, a value roughly comparable to our present result for Hg-1201.…”

Section: B Relaxation Behavior At Ambient Pressuresupporting

confidence: 80%

“…Because this anomalous behavior is a sensitive function of the concentration of interstitial oxygen δ in Tl-2201, it has been attributed [13] to relaxation effects within the oxygen sublattice; indeed, evidence for strong relaxation effects in T c from oxygen ordering were first obtained by Veal et al [14] in temperature-quench experiments on strongly underdoped YBa 2 Cu 3 O 7−y (Y-123). Evidence for relaxation effects in Y-123 from high-pressure data was obtained somewhat later [15,16].…”

Section: Introductionmentioning

confidence: 90%

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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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Section: B Relaxation Behavior At Ambient Pressuresupporting

confidence: 80%

Section: B Relaxation Behavior At Ambient Pressuresupporting

confidence: 80%

Section: Introductionmentioning

confidence: 90%

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Relaxation effects in the transition temperature of superconductingHgBa2CuO4+δ

et al. 1999

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“…This enhancement was attributed to the pressure-induced ordering of the chain oxygen in analogy to the results of the annealing experiments of Veal et al [83]. The pressure-induced redistribution of oxygen was investigated in more detail with respect to the characteristic time relaxation of T c at different temperatures [91,92]. Changing pressure abruptly at room temperature and measuring T c at different times after storing the pressurized sample at 298 K a typical relaxation behavior as shown in Fig.…”

Section: Pressure-induced Redistribution Of Mobile Oxygen In Htsmentioning

confidence: 59%

“…With increasing δ YBa 2 Cu 3 O 7-δ becomes under-doped and more oxygen vacancies are created in the CuO chains. A giant pressure coefficient dT c /dp of up to 30 K/GPa was reported for very under-doped YBa 2 Cu 3 O 7-δ [91] (see Fig. 12) when pressure was imposed at room temperature.…”

Section: Pressure-induced Redistribution Of Mobile Oxygen In Htsmentioning

confidence: 91%

High Pressure Effects on Superconductivity

Lorenz

Chu

2005

Frontiers in Superconducting Materials

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The review is devoted to a discussion of the effects of high pressure imposed on superconducting materials. Low-temperature superconductors, high-temperature superconducting cuprates, and some unconventional superconducting compounds are investigated. Experimental as well as theoretical results regarding the pressure effects on Tc and other interesting properties are summarized.Comment: To be published in: "Frontiers in Superconducting Materials", Edt. A. Narlikar, Springer Verla

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Relationship between and implications of the isotope and pressure effects on transition temperature, penetration depths and conductivities

Schneider

2004

Physica Status Solidi (b)

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It is shown that the empirical relations between transition temperature, normal state conductivity linearly extrapolated to the value at the transition temperature, zero temperature penetration depths, etc., as observed in a rich variety of cuprate superconductors, are remarkably consistent with the universal critical properties of anisotropic systems which fall into the 3D-XY universality class and undergo a crossover to a quantum critical point in 2D. The variety includes n-and p-type cuprates, comprises the underdoped and overdoped regimes and the consistency extends up to six decades in the scaling variables. The resulting scaling relations for the oxygen isotope hydrostatic pressure effects agree with the experimental data and reveal that these effects originate from local lattice distortions preserving the volume of the unit cell. These observations single out 3D and anisotropic microscopic models which incorporate local lattice distortions, fall in the experimentally accessible regime into the 3D-XY universality class, and incorporate the crossover to 2D quantum criticality where superconductivity disappears.

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Giant pressure effect in oxygen deficient YBa2Cu3Ox

Cited by 63 publications

References 26 publications

Relaxation effects in the transition temperature of superconductingHgBa2CuO4+δ

Relaxation effects in the transition temperature of superconductingHgBa2CuO4+δ

High Pressure Effects on Superconductivity

Relationship between and implications of the isotope and pressure effects on transition temperature, penetration depths and conductivities

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