logo

korean english

게시판

Home > 게시판 > 세미나

동경대학교의 Matsumoto 박사님초청하여 아래와 같이 세미나를 개최합니다.


학과 구성원 여러분의 많은 참석을 부탁 드립니다


                        


     1. 일시: 2015 4 21(화) 오전 11

     2. 장소: 삼성학술정보관 7층 Creative Learning Room

     3. 초청연사: Dr. Yosuke Matsumoto (Institute for Solid State Physics, University of Tokyo, Japan)

     4. 제목: Novel quantum criticality beyond Doniach phase diagram

     5. Abstract: Novel quantum phases formed in the vicinity of a quantum critical point (QCP) is one of the most important topics for strongly correlated electron systems. So far, quantum criticality (QC) in heavy fermion systems has been studied mainly for Kondo lattice systems with integer valence. In this case, QC is usually related to magnetism and is understood by so called Doniach phase diagram. Here, we would like to discuss two examples of novel QC which are beyond this picture. The one is the novel QC found in the mixed valent YbAlB4 systems. The first Yb-based heavy fermion superconductor -YbAlB4 [1,2] exhibits QC without tuning any control parameter, indicating formation of a strange metal phase [3]. Recent resistivity measurements under pressure have revealed indeed that a non-Fermi liquid phase extends over a finite pressure range up to ~ 0.4 GPa [4]. We will further discuss a sharp valence crossover induced by a chemical substitution in -YbAlB4, which is an isostructural polymorph of -YbAlB4. Interestingly, we observed a pronounced NFL behavior as a possible evidence of a quantum valence criticality [5]. Another example is a possibility of quantum criticality arising from orbital degrees of freedom. Our recent studies revealed that PrT2Al20 (T = Ti, V) are ideal systems to study such possibilities. The both systems have the nonmagnetic cubic 3 crystal electric field doublet [6]. In addition, the hybridization is strong as is evident in many physical properties [6]. We would like to discuss heavy fermion superconductivity observed inside the multipole ordering phases [7-9].


Reference
[1] S. Nakatsuji et al., Nature Phys. 4, 603 (2008).
[2] K. Kuga et al., Phys. Rev. Lett. 101, 137004 (2008).
[3] Y. Matsumoto et al., Science 331, 316 (2011). References therein.
[4] T. Tomita, K. Kuga, Y. Uwatoko, P. Coleman, and S. Nakatsuji, preprint (2015).
[5] K. Kuga et al., preprint (2015).
[6] A. Sakai, and S. Nakatsuji, JPSJ 80, 063701 (2011). References therein.
[7] A. Sakai et al., JPSJ 81, 083702 (2012).
[8] K. Matsubayashi et al., PRL 109, 187004 (2012).
[9] M. Tsujimoto et al., PRL 113, 267001 (2014). References therein.

번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1091812
299 <2/10(화) 오후 2시> 특별 초청세미나 개최 안내 file 2015.02.06 79939
298 2014 노벨물리학상 수상자인 나고야 대학교 아마노 히로시 교수 초청 특강 2015.02.23 61417
297 <3/16(월)> 초청세미나 개최 안내 2015.02.27 59519
296 2015학년도 1학기 콜로퀴움 일정 file 2015.02.27 88973
295 <3/11(수) 오후4시:30분> 테크노-이매지네이션(Techno-imagination) 2015.03.04 63699
294 <3/13(금) pm1:00> 초청세미나 개최 안내 2015.03.09 91052
293 <3/18(수) 오후4:30분> 시장리스크 관리(Market Risk Management) 소개 2015.03.11 65761
292 <3/25(수) 오후4:30분> 슈퍼컴퓨터와 국가경쟁력 2015.03.19 61849
291 <3/31(화)> 초청세미나 개최 안내 2015.03.24 80927
290 <4/1(수) 오후4:30분> 과학기술과 미디어 2015.03.26 62601
289 <4/7(화)> 특별초청세미나 개최 안내 2015.04.01 78743
288 <4/8(수) 오후4:30분> 우라늄의 일생 2015.04.02 65887
» <4/21(화)> 특별초청세미나 개최 안내 2015.04.03 84611
286 <4/15(수) 오후4:30분> Who is SHE? 2015.04.08 110796
285 <4/15(수)> 세미나 개최 안내 2015.04.09 66921
284 <4/24(금)> 초청세미나 개최 안내 file 2015.04.13 58711
283 <4/29(수) 오후4:30분> 양자정보 2015.04.23 61242
282 <4/25(토)> 세미나 개최 안내 2015.04.23 84385
281 <5/6(수) 오후4:30분> 빛의 여행 2015.04.29 62605
280 <5/13(수) 오후4:30분> 내가 몰랐던 대한민국 2015.05.07 59651