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Structural Phase Transformations and High-Tc Superconductivity

Axe, J. D. / You, H. / Hohlwein, D. / Cox, D. E. / Moss, S. C. / Forster, K. / Hor, P. / Meng, R. L. / Chu, C. W.

Abstract There is an intimate if imprecisely understood connection between high Tc superconductivity and crystal structure instability. Most of the highest Tc superconductors (Tc ≈20K) discovered in the past 20 years have the so-called A15-type structure, which is marginally stable in the sense that many of the A15 compounds spontaneously distort at low temperatures into a lower symmetry structure. These distortions are driven by unstable low frequency phonon modes. It is believed that these “soft” phonon modes enhance the attractive interaction between electrons and thus tend to increase Tc. On the other hand (the argument goes) phase transformation which lower the symmetry introduce structural gaps at the Fermi surface of metals which compete with superconductivity and tend to decrease Tc.

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Structural Phase Transformations and High-Tc Superconductivity

Axe, J. D. / You, H. / Hohlwein, D. / Cox, D. E. / Moss, S. C. / Forster, K. / Hor, P. / Meng, R. L. / Chu, C. W.

Abstract There is an intimate if imprecisely understood connection between high Tc superconductivity and crystal structure instability. Most of the highest Tc superconductors (Tc ≈20K) discovered in the past 20 years have the so-called A15-type structure, which is marginally stable in the sense that many of the A15 compounds spontaneously distort at low temperatures into a lower symmetry structure. These distortions are driven by unstable low frequency phonon modes. It is believed that these “soft” phonon modes enhance the attractive interaction between electrons and thus tend to increase Tc. On the other hand (the argument goes) phase transformation which lower the symmetry introduce structural gaps at the Fermi surface of metals which compete with superconductivity and tend to decrease Tc.

Structural Phase Transformations and High-Tc Superconductivity

Axe, J. D. / You, H. / Hohlwein, D. / Cox, D. E. / Moss, S. C. / Forster, K. / Hor, P. / Meng, R. L. / Chu, C. W.

Abstract There is an intimate if imprecisely understood connection between high Tc superconductivity and crystal structure instability. Most of the highest Tc superconductors (Tc ≈20K) discovered in the past 20 years have the so-called A15-type structure, which is marginally stable in the sense that many of the A15 compounds spontaneously distort at low temperatures into a lower symmetry structure. These distortions are driven by unstable low frequency phonon modes. It is believed that these “soft” phonon modes enhance the attractive interaction between electrons and thus tend to increase Tc. On the other hand (the argument goes) phase transformation which lower the symmetry introduce structural gaps at the Fermi surface of metals which compete with superconductivity and tend to decrease Tc.

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Title:

Structural Phase Transformations and High-Tc Superconductivity

Contributors:

Axe, J. D. (author) / You, H. (author) / Hohlwein, D. (author) / Cox, D. E. (author) / Moss, S. C. (author) / Forster, K. (author) / Hor, P. (author) / Meng, R. L. (author) / Chu, C. W. (author)

Published in:

Novel Superconductivity ; 748-750

Publication date:

1987-01-01

Size:

3 pages

ISBN:

978-1-4612-9076-6 , 978-1-4613-1937-5

DOI:

https://doi.org/10.1007/978-1-4613-1937-5_87

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

Physics , Strongly Correlated Systems, Superconductivity , Characterization and Evaluation of Materials

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