visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2023-06-08 16:00 
일시 June 8, 16:00 
장소 E6-2, #1323 
연사 Prof. Gun-Do Lee( Seoul National University) 
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 장소 제목
348 2018-12-07 14:30  E6-2. 1st fl. #1323  Spin generation from heat and light in metals file
347 2018-12-07 16:00  E6-2. 1st fl. #1323  Novel probes of interacting electrons in 2D systems file
346 2018-12-11 16:00  E6-2. 1st fl. #1323  Natural compact representation of Matsubara Green’s functions: applications to analytic continuation and quantum many-body simulations file
345 2018-12-16 16:00  E6-2. 1st fl. #1323  Lectures on 2d Conformal Field Theory file
344 2018-12-26 16:00  E6-2. 1st fl. #1323  Brane-like defect in 3D toric code file
343 2018-12-26 16:00  E6-1. 3rd fl. #3434  Informal Workshop on Topology and Correlation file
342 2018-12-27 16:00  E6-2. 1st fl. #1323  Quantum Innovation (QuIN) Laboratory file
341 2019-01-07 15:00  E6-2. 2st fl. #2501  Many-Body Invariants for Multipoles in Higher-Order Topological Insulators file
340 2019-01-09 16:00  E6-2. 2nd fl. #2501  Molecular Mott state in the deficient spinel GaV4S8 file
339 2019-01-23 16:00  Rm. C303, Creation Hall (3F), Munji Campus  Ultrasensitive Microwave Bolometer: Opportunity for Axion Detectors file
338 2019-02-21 16:00  #5313, E6-2  B-meson charged current anomalies - Theoretical status file
337 2019-02-25 16:00  Rm. 1501 (E6)  Spring 2019: Physics Colloquium file
336 2019-03-21 16:00  RM. 1323, E6-2  Spring 2019: Physics Seminar Serises file
335 2019-03-26 15:00  E6-2. 2st fl. #2501  Consideration of thermal Hall effect in frustrated and un-frustrated quantum magnets file
334 2019-03-29 14:30  E6-2. 1st fl. #1323  Epitaxial Multifunctional Oxide Thin Films for Novel Electronics file
333 2019-03-29 16:00  E6-2. 1st fl. #1323  Coherent Quantum Control and Magnetism on atoms – Trapped ion and ESR STM file
332 2019-04-04 16:00  #1323, E6-2  Chiral spin-photon interaction at nanoscale file
331 2019-04-11 16:00  #1323, E6-2  Massive screening for cathode active materials using deep neural network file
330 2019-04-19 11:00  #1323, E6-2  First-principles studies of semiconductors for solar cell applications file
329 2019-04-19 14:30  E6-2. 1st fl. #1323  A family of finite-temperature electronic phase transitions in graphene multilayers file