logo

korean english

게시판

Home > 게시판 > 세미나

Seminar <6/19> 초전도 특별세미나

2012.06.11 17:02

관리자 조회 수:97662

Faculté des Sciences de Tunis의 S. Haddad 교수님을 초빙하여 아래와 같이 특별세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁 드립니다.

 

         아             래

 

     1. 일시: 2012년 6월 19일(화) 11:00 ~ 12:00 

 

     2. 장소: Presentation Room in Samsung Library (2nd floor on the north side)

 

     3. 초청연사: Prof. S. Haddad (Faculté des Sciences de Tunis)

 

     4. 제목: Inhomogeneous organic superconductors: role of disorder and magnetic field 

 

     5. 초록: Several experimental studies in low dimensional organic superconductors have given evidence for a phase

                 segregated state where superconducting coexist with and non superconducting domains. The superconducting

                 properties are found to be strongly dependent on the amount of disorder introduced in the sample regardless its

                 origin. The suppression of the superconducting transition temperature Tc shows clear discrepancy with the result

                 expected from the Abrikosov-Gor’kov law giving the behavior of Tc with impurities. Based on the time dependent

                 Ginzburg-Landau theory, we derive a model to account for the striking feature of Tc in organic superconductors for

                 different types of disorder by considering the segregated texture of the system. We also address the possibility of

                 enhanced upper critical field and Nernst signal in a stack of superconducting slabs alternating with

                 nonsuperconducting domains. This enhancement is ascribed to the superconducting fluctuations which become

                 more important as the dimensionality of the system is reduced. We derive, as a function of the superconducting

                 slab thickness L, the upper critical field Hc2 along the slabs and the Peltier coefficient on which depends the

                 Nernst signal. We show that Hc2 exhibits an upward curvature in the two dimensional (2D) limit where the

                 interplane coherence length ξ is smaller than the superlattice periodicity D = L+d, d being the size of the

                 nonsuperconducting domain. In this limit, Nernst signal is found to be strongly enhanced compared to the 3D case.

                 The results are discussed in

                 connection with experimental observations in quasi-1D organic superconductors and superlattices of high-Tc

                 films.

번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1078351
505 <4/19> Nuclear Reaction Theories 2011.04.14 99260
504 <5/18> Three magics to hold an atom without perturbation 2011.05.09 99200
503 <2/14> Complex network models for mobile ad hoc networks 2011.02.11 99173
502 <11/19> From Schrödinger's cat to quantum technology using light 2010.11.11 99099
501 <12/3> Magnetic couplings, optical spectra, and spin-orbit exciton in 5d Mott insulator Sr2IrO4 2012.11.26 99043
500 <Jan.28(Thu.)>X-ray Absorption Spectroscopy Study of Amorphous Oxide Thin Films 2021.01.27 99043
499 <12/19> The BLG Theory in Light-Cone Superspace 2009.12.15 99020
498 <11/11> Revealing magnetism of nanoislands with quantitative insights into spin-polarized scanning tunneling spectroscopy 2013.11.05 98385
497 <9/1> 원자핵 자기공명(Nuclear Magnetic Resonance) 해설 - 원자선에서 영상까지 2010.08.30 98224
496 <5/12(월)> Nanoscale probing of electrochemical phenomena and ionic dynamics by scanning probe microscopy 2014.05.07 97964
495 <11/14> Resonance collective mode in novel superconductors 2008.11.11 97907
494 <6/18> A consistent truncation of D=11 supergravity to D=4, N=2 supergravity using wrapped M5-branes 2010.06.10 97902
493 <7/14> Calculating the partition function of N=2 Gauge theories on $S^3$ and AdS/CFT correspondence 2011.07.12 97831
492 영어초록 예시 2008.03.18 97721
» <6/19> 초전도 특별세미나 2012.06.11 97662
490 <10/8 (월)>물리학과 특별세미나 개최 안내 2012.10.05 97514
489 <11/27> 중성자로 보는 작은 세상 속 큰 물리 2009.11.24 97241
488 <10/16> SPM Study of CVD Graphene on h-BN Film 2013.10.04 97162
487 <10/9> Smearing effect of membrane in plane-wave matrix model 2009.10.05 97119
486 <10/10>Self-reconfigurable robots 2008.10.07 96904