Specific heat and sound velocity at the relevant competing phase of high-temperature superconductors

Varma Chandra M.; Zhu Lijun

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Specific heat and sound velocity at the relevant competing phase of high-temperature superconductors

机译：Specific heat and sound velocity at the relevant competing phase of high-temperature superconductors

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摘要

Recent highly accurate sound velocity measurements reveal a phase transition to a competing phase in YBa2Cu3O6+delta that is not identified in available specific heat measurements. We show that this signature is consistent with the universality class of the loop current-ordered state when the free-energy reduction is similar to the superconducting condensation energy, due to the anomalous fluctuation region of such a transition. We also compare the measured specific heat with some usual types of transitions, which are observed at lower temperatures in some cuprates, and find that the upper limit of the energy reduction due to them is about 1/40th the superconducting condensation energy.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2015年第20期|6331-6335|共5页
作者
Varma Chandra M.; Zhu Lijun;
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作者单位

Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
high-temperature superconductor; pseudogap; thermodynamics; resonant ultrasound spectroscopy; loop current order;

Specific heat and sound velocity at the relevant competing phase of high-temperature superconductors

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