Ultrasound study of YBa2Cu3O7−δ samples of different microstructure

Lemmens, P.; Stellmach, F.; Ewert, S.; Guo, Simon; Wynants, J.; Arlt, G.; Comberg, A.; Passing, H.; Marbach, Gerolf

doi:10.1016/0921-4534(88)90599-0

Cited by 27 publications

(7 citation statements)

References 9 publications

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“…However, Ewert et al [6] measured the hysteresis of the longtudinal wave velocity only for coarse grained YBCO samples, but neither thermal hysteresis nor softening for fine grained samples. This result has been confirmed by others [7,8]. The thermal hysteresis was ascribed to microstructure [6] or the relaxation of thermoelastic stress caused by the anisotropy of the thermal expansion of grains [71, instead of phase transitions.…”

Section: Introductionsupporting

confidence: 80%

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Study on Thermal Hysteresis of Elastic Modulus in Granular Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O

Wang

Sun

et al. 1990

MRS Proc.

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A large thermal hysteresis ( > 100 K) of elastic modulus was measured for coarse grained Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O. Whereas, only a small thermal hysteresis (2--3 K) near the velocity minima at 240 K, and 150 K was observed in Bi 2 Sr 2 CaCu 2 0 8 single crystal, which were found to be associated with phaselike transitions (PLT). The investigations of isothermal recovery of modulus for coarse grained YBCO and BSCCO disclose that the large thermal hysteresis may be attributed to the defects of pore size generated in the interconnecting region between grains as a result of PLT of weak first order but covering a wide temperature range. The mechanism of a large thermal hysteresis for coarse grained samples has been discussed in detail.

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Section: Introductionsupporting

confidence: 80%

“…The following creep function is obeyed, Arrhenius relation, so the mechanism of oxygen vacancy diffusion [8] should be ruled out. Instead, -vs. T relation is similar to the C-curve for isothermal martensitic transition.…”

Section: -mentioning

confidence: 99%

Study on Thermal Hysteresis of Elastic Modulus in Granular Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O

Wang

Sun

et al. 1990

MRS Proc.

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“…In Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O, the temperature dependence of the sound velocity and attenuation depend somewhat on the microstructure or porosity of the samples [1,2]. Sound velocity decreases with increasing porosity and absorption apparently increases with increasing porosity.…”

Section: Introductionmentioning

confidence: 99%

Elastic properties and ultrasonic attenuation of TlSr₂(Sr_0.5Y_0.5)Cu₂O₇superconductors

Hassan

Abd‐Shukor

Alwi

2002

Supercond. Sci. Technol.

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The elastic properties and ultrasonic attenuation of TlSr 2 (Sr 0.5 Y 0.5 )Cu 2 O 7 have been determined between 80 and 280 K at frequencies in the 10 MHz region. Electrical resistance versus temperature measurement showed that the critical temperature is 88 K. Ultrasonic measurements showed a change in longitudinal velocity gradient and the attenuation peak around 200 K. The results were explained in terms of the phase transition associated with local oxygen ordering. The shear velocity showed an almost monotonic increase between 220 and 80 K and no attenuation peak is observed in this mode.

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“…The slope change of the sound velocity [4,7,9,11,12] or the elastic modulus [l, 2,4,13] has been attributed to a structural second-order phase transition. The BCS picture has also been used to account for the internal friction decrease below T, [2, 14].…”

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confidence: 99%

Effects of Different Dopants on Diffuse Phase Transition and Ordering Degree in Lead Magnesium Niobate

Yang¹,

Feng²,

Yao³

et al. 2001

Jpn. J. Appl. Phys.

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PACS. 74.70Y -Other superconducting materials. PACS. 62.40 -Anelasticity, internal friction and mechanical resonances (inc. stress relaxation).Abstract. -The internal friction and Young's modulus of Y B~& U~O , -~ have been measured between 4 K and 300K for 6-0 and 0.6<6<1. A point defect relaxation process with an activation energy of 0.1eV occurs in the tetragonal samples. It is found that the number of relaxing entities vanishes when the oxygen concentration is increased and when the thermal treatment allows oxygen ordering in the CuO plane. The relaxation might be attributed to some oxygen atoms in this plane which have formed pairs, or which are isolated but trapped by defects.

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Ultrasound study of YBa2Cu3O7−δ samples of different microstructure

Cited by 27 publications

References 9 publications

Study on Thermal Hysteresis of Elastic Modulus in Granular Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O

Study on Thermal Hysteresis of Elastic Modulus in Granular Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O

Elastic properties and ultrasonic attenuation of TlSr₂(Sr_0.5Y_0.5)Cu₂O₇superconductors

Effects of Different Dopants on Diffuse Phase Transition and Ordering Degree in Lead Magnesium Niobate

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Ultrasound study of YBa2Cu3O7−δ samples of different microstructure

Cited by 27 publications

References 9 publications

Study on Thermal Hysteresis of Elastic Modulus in Granular Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O

Study on Thermal Hysteresis of Elastic Modulus in Granular Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O

Elastic properties and ultrasonic attenuation of TlSr2(Sr0.5Y0.5)Cu2O7superconductors

Effects of Different Dopants on Diffuse Phase Transition and Ordering Degree in Lead Magnesium Niobate

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Elastic properties and ultrasonic attenuation of TlSr₂(Sr_0.5Y_0.5)Cu₂O₇superconductors