visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2023-06-08 16:00 
연사  
장소 E6-2, #1323 
서울대학교 이건도 연구교수님을 모시고 'Thermal decoupling in high-Tc cuprate superconductors' 주제에 대한 세미나를 개최하고자 합니다. 
물리학과 구성원 여러분들의 많은 참여 부탁드립니다.
 
1) Time : at 16:00 on June 8, 2023 
2) Venue : Room 1323, KAIST Natural Sciences Lecture Hall(E6) (자연과학동 1323호)  
3) Speaker : 이건도 연구교수 (서울대학교) 
4) Talk Title
    - Thermal decoupling in high-Tc cuprate superconductors
 
5) Abstract
    -  Although many years have passed since the discovery of high-critical-temperature (high-Tc) superconducting materials, the underlying mechanism is still unknown. The B1g phonon anomaly in high-Tc cuprate superconductors has long been studied; however, the correlation between the B1g phonon anomaly and superconductivity has yet to be clarified. In the present study, we successfully reproduced the B1g phonon anomaly in YBa2Cu3O7 (YBCO) using an ab initio molecular dynamics (AIMD) simulation and temperature-dependent effective potential (TDEP) method. The Ag phonon by Ba atoms shows a more severe anomaly than the B1g phonon at low temperatures. Our analysis of the phonon anomaly and the temperature-dependent phonon dispersion indicated that decoupling between thermal phenomena and electron transport at low temperatures leads to layer-by-layer thermal decoupling in YBCO. Electronically and thermally isolated Ba atoms in YBCO are responsible for thermal decoupling which is found to be the origin of the breakdown of the Wiedemann-Franz law and the thermal Hall effect in cuprates. The analytic study of the thermal decoupling revealed that Planckian dissipation expressing linear-T resistivity is another expression of the Fermi liquid of the CuO2 plane. The Uemura plot of the relationship between Tc and the Fermi temperature, as well as the superconducting dome in YBCO, is explained rigorously and quantitatively. Our findings not only present a new paradigm for understanding high-Tc superconductivity but also imply that the spontaneous formation of low-temperature layers in materials can lead to revolutionary changes in the thermal issues of industrial fields.

 

[1] S. LeeW. ChoiY. KimY.-K. KwonD. SongM. KimG.-D. Lee Thermal decoupling in high-Tc cuprate superconductors, Preprint at https://arxiv.org/abs/2303.11600 (2023).

 
번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
614 2009-02-23 16:00    Physics Colloquium : 2009 Spring file
613 2009-09-07 16:00    Physics Colloquium : 2009 Fall file
612 2009-10-21 16:00    Interdimensional Universality of Dynamic Interfaces
611 2010-02-08 16:00    Physics Ciolloquium : 2010 Spring file
610 2010-02-14 16:00    Physics Colloquium - 2011 Spring file
609 2010-09-06 16:00    Physics Colloquium : 2010 Fall file
608 2011-05-16 16:00    Photonics with surface plasmon polaritons
607 2011-09-03 16:00    Physics Colloquium : 2011 Fall file
606 2012-02-13 16:00    Physics Colloquium : 2012 Spring
605 2012-04-02 16:00    A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4
604 2013-03-11 16:00    Physics Colloquium : 2013 Spring
603 2013-09-09 16:00    Physics Colloquium : 2013 Fall
602 2014-03-10 16:00    Physics Colloquium : 2014 Spring file
601 2014-05-28 17:00    부품소재산업이 미래다
600 2014-12-22 14:00    Dynamics of molecular motors: Power stroke vs Brownian ratchet file
599 2015-03-04 12:00    Bioimaging and Biosensing Using Near-Infrared Fluorescence file
598 2015-03-09 16:00    Physics Colloquium : 2015 Spring file
597 2015-03-13 14:00    The 15th Innovative Workshop on Soft/Bio Materials file
596 2015-06-03 12:00    The First Wednesday Multidisciplinary Forum file
595 2015-07-15 14:00    Electronic and optical properties of titanate-based oxide superlattices