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 1088839
695 <12/3> Magnetic couplings, optical spectra, and spin-orbit exciton in 5d Mott insulator Sr2IrO4 2012.11.26 452442
694 2019학년도 2학기 콜로퀴움 일정 2019.07.17 428744
693 <Mar.3(Wed.)>Scaling laws in Natural Language Processing 2021.02.25 370214
692 2017학년도 1학기 콜로퀴움 일정 2017.01.05 331087
691 <10/25> Wave properties of dipole-exchange spin waves in confined magnetic thin films 2006.10.25 309173
690 <5/16> 물리학자가 바라 본 단백질: 왜, 어떻게 연구하는가? 2012.05.10 280304
689 <6/11> Advanced Physiological Optics and Its Ophthalmic Applications 2014.05.28 279974
688 <6/17> Oscillating Fuzzy Sphere and M5/anti M5 configurations in ABJM model 2009.06.16 263053
687 <8/30(Wed.)10:30>​Technology convergence and applications of Large-Area Electronics, e-Textiles, bio-sensors and bio-electronics 2017.08.29 261285
686 <12/21> Special Seminar by Professor Ilya Vekhter 2010.11.30 259604
685 <3/14>Adaptive Optics for the Human Eye and Ophthalmic Applications 2008.03.12 257848
684 BK 석학초청 특별세미나 - Frustration and dimensional reduction in multi-orbital systems 2011.10.28 256548
683 2020학년도 1학기 콜로퀴움 일정 2020.01.31 255929
682 <Jan.14(Thu.)>Oxygen sponge effects for epitaxial manganite thin film design 2021.01.11 247006
681 <11/6> Graphene plasmon and Plasmonics 2013.10.31 243986
680 <June.12(Wed.)> Ribocomputing: Cellular Logic Computation using RNA Devices file 2019.06.07 243043
679 <11/5(화)> 특별세미나 개최 안내 2013.11.01 234270
678 <5/16(토)> 세미나 개최 안내 2015.05.18 227018
677 <Sep. 23(Wed.) 4:30 PM>Grain boundary effect in Metal : A journey of discovery from crystal to thin films without grain boundaries 2015.09.16 217146