Propagation of ultrasonic waves and anomalies nearT c in single crystalline YBa2Cu3O7?x high-T c superconductors

Kim, T. J.; Kowalewski, Jerzy; Aßmus, W.; Grill, Wolfgang

doi:10.1007/bf01307837

Cited by 44 publications

(15 citation statements)

References 29 publications

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“…of the corresponding elastic moduli below -200 K. U p to now, the data on hysteresis of elastic properties of 123-YBCO single crystal were only reported in [12]. Results of [12], obtained in the MHz-frequency range, are consistent qualitatively with our data.…”

Section: Ae/e(t)supporting

confidence: 88%

Anisotropy of Elastic and Relaxation Properties of the Superconducting 123-YBCO Single Crystal

et al. 1996

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Acoustic properties of the YBa2Cu3O6.7 sigle crystal are studied in the temperature range 5-300 K. The wave vector of the longitudinal and torsional standing waves in the frequency range 50 - 90 kHz was directed along and normal to the c-axis. It is showm that the acoustic anomalies observed in the single crystal qualitatively are the same that those found earlier in the 123-YBCO ceramics but depend strongly on the mutual orientation of the wave vector and the c-axis. It is established that the significant temperature hysteresis and "softening" of the dynamic elastic moduli at thermocycling are observed only in the case when the sound waves have a displacement component along the c-axis. Moreover, in this case the sound absorption peak near 230 K is more pronounced. The locations of sound absorption peaks are not sensitive to the oscillation mode and sample orientation. The results obtained are qualitatively consistent with the model of bistable behaviour of the sublattice formed by apical oxygen atoms

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Section: Ae/e(t)supporting

confidence: 88%

Anisotropy of Elastic and Relaxation Properties of the Superconducting 123-YBCO Single Crystal

et al. 1996

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“…Bhattacharya et al [6] observed an increase of 4000 ppm below T,. The change of slope we got in the temperature dependence of Young's modulus sound velocity is close to the value obtained in single crystals by Kim et al [7]. The features observed by us resemble the results of model calculations based on a thermodynamic treatment.…”

supporting

confidence: 89%

Discontinuous Drop of Young's Modulus Sound Velocity at the Superconducting Transition of YBa₂Cu₃O_7−x

Kumar

Vidhya

1993

Physica Status Solidi (b)

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“…A theoretical calculation [25] of the elastic stiffness moduli predicts similar sound wave velocities for polycrystalline YBa2Cu3OT., (table 2). For single-crystal YBa2Cu3OT., a comparable value for an average longitudinal wave velocity of 4460ms _ was obtained [3] from published data [26]; the single-crystal ultrasonic wave velocity measurements of Saint-Paul et al [27] are in accord with this. These observations evidence that the ultrasonic technique measures correct sound wave velocities for the ceramics.…”

Section: Ultrasonic Wave Velocities and Elastic Stiffnessessupporting

confidence: 67%

Ultrasonic determination of the elastic moduli and their pressure dependences in very dense YBa{sub 2}Cu{sub 3}O{sub 7{minus}x}

Cankurtaran¹,

Saunders²,

Goretta³

et al. 1991

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I Thesubmitted manuscrll:_ hu beenauthored by , _, e contractorof the US, Gov.tnment und., 0 _ T I contracl No.W.31-109-ENG.38Accordingly, the U,S.Government retainsa nonexcluslve, royalty. freeUcense to publishor reproduce thepublished formofthiscontribution, orallowothersto doto, forUS. Government purposes. DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employc_s, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclose, or represents that its use would not infringe privately owned rights. Refer-en_ herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not n_._ssadly constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

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Propagation of ultrasonic waves and anomalies nearT c in single crystalline YBa2Cu3O7?x high-T c superconductors

Cited by 44 publications

References 29 publications

Anisotropy of Elastic and Relaxation Properties of the Superconducting 123-YBCO Single Crystal

Anisotropy of Elastic and Relaxation Properties of the Superconducting 123-YBCO Single Crystal

Discontinuous Drop of Young's Modulus Sound Velocity at the Superconducting Transition of YBa₂Cu₃O_7−x

Ultrasonic determination of the elastic moduli and their pressure dependences in very dense YBa{sub 2}Cu{sub 3}O{sub 7{minus}x}

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Propagation of ultrasonic waves and anomalies nearT c in single crystalline YBa2Cu3O7?x high-T c superconductors

Cited by 44 publications

References 29 publications

Anisotropy of Elastic and Relaxation Properties of the Superconducting 123-YBCO Single Crystal

Anisotropy of Elastic and Relaxation Properties of the Superconducting 123-YBCO Single Crystal

Discontinuous Drop of Young's Modulus Sound Velocity at the Superconducting Transition of YBa2Cu3O7−x

Ultrasonic determination of the elastic moduli and their pressure dependences in very dense YBa{sub 2}Cu{sub 3}O{sub 7{minus}x}

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Discontinuous Drop of Young's Modulus Sound Velocity at the Superconducting Transition of YBa₂Cu₃O_7−x