Ultrasonics of High-Tc and Other Unconventional Superconductors

Physical Acoustics, Volume XX: Ultrasonics of High-Tc and Other Unconventional Superconductors covers the many acoustic studies of the high-Tc superconductors. This book is composed of 10 chapters that include some unconventional superconducting systems, such as superfluid 3He, heavy Fermion superconductors, and magnetic re-entrant superconductors.
The introductory chapter summarizes the results that have been observed in Bardeen, Cooper, and Schriefer superconductors as functions both of temperature and magnetic field. The subsequent chapters deal with the theoretical and experimental aspects of ultrasonic study of some unconventional superconductors. Considerable chapters are devoted to the measurements with sound waves on the sintered high-Tc superconducting systems. These chapters examine first the temperature and magnetic field dependence of the velocity and elastic constants in sintered high-Tc superconductors, as well as the sound absorption and dispersion measurements on single crystals of these superconductors. Discussions on the small-sample resonant ultrasound technique that uses thin piezoelectric films and the effect of oxygen on superconducting properties and the response of sound to these additions are also provided in these chapters. The concluding chapter presents a theoretical foundation for sound measurements in the superconducting state, emphasizing the effects of multigap structures and gas anisotropy on sound attenuation in the superconducting state of the cuprate superconductors.
This volume will be of great benefit to researchers in the fields of electronics technology and in applied and engineering mechanics.

Contenu

Contributors

Preface

1 Ultrasonic Attenuation in Conventional Superconductors

1. Introduction

2. Temperature Dependence

3. Magnetic Field Dependence

   Acknowledgment

   References

2 Sound Propagation and Collective Modes in Superfluid 3He

1. Introduction

2. Normal State of 3He

3. Superfluid 3He

4. Collective Modes

5. Experimental Results

6. Conclusions

   Acknowledgments

   References

3 Sound Propagation in the Heavy Fermion Superconductors

1. Introduction

2. Sound Propagation in Conventional Superconductors

3. Unconventional Superconductivity

4. Heavy Fermion Systems

5. UPt3

6. UBe13

7. URu2Si2

8. Ce Cu6

9. Conclusions

   Acknowledgments

   References

4 Ultrasonic Attenuation in the Magnetic Superconducting System Er1-xHoxRh4B4

1. Introduction

2. Experimental Details and Physical Properties

3. Common Attenuation Behavior

4. Special Attenuation Behavior

5. Summary

   Acknowledgments

   References

5 Ultrasonic propagation on in Sitered High-Tc Superconductors

1. Introduction

2. Attenuation and Velocity in La2-xSrxCuO4

3. Ordinary Sintered YBa2Cu3O7-d

4. Oriented YBa2Cu3O7-d

5. Sound Propagation in GdBa2Cu3O7-d and ErBa2Cu3O7- d

6. BiSrCaCuO and TlBaCaCuO Superconducting Compounds

7. Sound Propagation in Ba1-xKxBiO3

8. Summary

   Acknowledgment

   Appendix A Crystal Structure of High-Tc Superconductors

   Appendix B Selected Velocities and Elastic Constants for High-Tc Superconductors

   Appendix C Temperature Position of Attenuation Peaks for Sinter-Forged YBa2Cu3O7 Samples

   Appendix D Activation Energies for Relaxation Times

   Associated with Relaxation Attenuation Peaks

   References

6 Sound Velocity Studies of Ceramic High-Temperature Superconductors

1. Introduction

2. Theory

3. Sound Velocity in Ceramic Samples

4. Results Near Tc

5. Magnetic Field Dependence

6. Conclusions

   References

   Bibliography

7 Acoustic Studies of Single-Crystal High-Tc Superconductors

1. Introduction

2. The High-Tc Superconductors

3. Acoustic Methods for Small Single Crystals

4. Single-Crystal Experiments and Results

5. Summary and Outlook

8 Ultrasonic Measurements of Elastic Constants in Single Crystals of La2CuO4

1. Introduction

2. Development of the Small-Sample Resonant Ultrasound Technique

3. Measurements on Single-Crystal Samples of La2CuO4

4. Measurements in Superconducting La1.86Sr0.14CuO4

   Acknowledgments

   References

9 A Rationalization of the Diversity in the Elastic Response of Polycrystalline Superconducting Oxides

1. Introduction

2. Review of Initial Work

3. A Comparison of the Ultrasonic Characteristics of Superconducting and Non-superconducting Material

4. High-Temperature Anomalies

5. Conclusions

   Acknowledgments

   References

10 High-Tc Superconductivity and Ultrasonics-Theoretical Aspects

1. Introduction

2. Sound Attenuation and Conventional Superconductivity

3. Exotic Superconductors (Organic Materials;Heavy Fermions)

4. High-Tc Oxides

5. Ultrasonic Attenuation in High-Tc Oxides

   Acknowledgment

   References

Index

Contents Of Volumes in this Series