logo

korean english

게시판

Home > 게시판 > 세미나

양자물질초전도체창의연구소에서 IBS-Center for Correlated Electron Systems의 C. I. Sathish 박사님을 초청하여 세미나를 개최합니다.


○ Date : 2016년 3월 18일(금) 오전 11:00
○ Place :  학술정보관 2층 프리젠테이션룸

○ Speaker : Dr.  C. I. Sathish (IBS-Center for Correlated Electron Systems)
○ Topic : High Pressure Synthesis and Characterization of Non-Oxide Superconductors

○ Abstract: 

High pressure research has captured growing interest in last decades due to its promising applications. Using high pressure many new superconducting and magnetic materials have been discovered so far. My research is focused mainly on different series of materials like, Transition carbide materials like MoC, Bismuth sulfide (BiS2) based layered materials Bi4O4S3 and LaOBiS2, Fe-Si based heavy fermion (LnFe3Si5) and 122 (LnFe2Si2) series of materials,

Synthesis of cubic δ-MoC phases that possess useful properties for condensed matter science and possibly future technologies were carried out. A theoretical study predicted that in the case of stoichiometric MoC, if it is synthesized, superconductivity will appear at a critical temperature that is considerably higher than the critical temperatures that have thus far been achieved. Under the high-pressure and high-temperature conditions, cubic δ-MoC0.681 and δ-MoC0.746 phases were finally synthesized by heating at 6 GPa and 17 GPa, respectively. Although the stoichiometric MoC was not synthesized unfortunately under these conditions, the critical temperature of 14.3 K, which is the highest among the binary metal carbides, was evidenced to reflect the true bulk nature of δ-MoC0.746.

A new type of layered-structure material with bismuth and sulfur was claimed to be a superconductor, and it had a great impact on research as new layered superconducting material. However, the detailed properties of these materials and the cause for superconductivity were not well established. In our study, BiS2 layered Bi4O4S3 and LaOBiS2 phases were successfully synthesized in high-quality by high-pressure and high temperature technique, the crystal structure and superconductivity were investigated in detail. From the results it clearly indicated that superconductivity does not truly reflect the bulk nature of the BiS2 layered phases, regardless of the manner in which these compounds were synthesized. This conclusion contradicted the results of ongoing studies on these compounds.



번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1059572
96 <Sep. 18(Fri.) 4:00 PM> Special seminar 2015.09.16 57924
95 학술세미나 개최 안내: Local Modes in Vibrational (and Rotational) Spectroscopy file 2015.10.01 55695
94 <Oct. 20(Tue.) 2:00 PM> High-throughput Synthesis of Oxide Thin Films 2015.10.05 127294
93 <Oct.15(Thu) 16:30> Single-Molecule Approach to Homology Search & Strand Exchange in Homologous Recombination 2015.10.12 108253
92 <Oct.20(Tue) 16:00> Electromagnetic Response and Thermomagnetic Instabilities in Three-Dimensional Nanostructured Superconductors file 2015.10.15 93964
91 <Oct.20(Tue) 10:00-12:00> Novel quantum transport in Weyl semimetals and double-Weyl semimetals 2015.10.23 84355
90 <Nov.13(Fri) 16:00> Kondo screening in mixed valence and heavy fermion compounds and the signatures of Nozieres’ exhaustion 2015.11.04 121850
89 <Dec.30(Wed) 16:30> Some basics about the thermoelectricity; the semi-classical Boltzmann transport approach 2015.12.24 66915
88 <March 8(Tue) 18:00> Unsolved puzzles of Gamma-Ray Bursts 2016.03.03 67865
» <March.18(Fri) 11:00> High Pressure Synthesis and Characterization of Non-Oxide Superconductors 2016.03.14 67589
86 <March.24(Thu) 14:00> A new boson and muon g-2 2016.03.17 65244
85 <4/6(Wed.) 1pm> Results from DM-Ice17 2016.04.05 78274
84 <April 25(Mon) 16:30> Neutron Recoil Polarization in Low‐energy Photodisintegration of the Deuteron 2016.04.25 53240
83 <May.27(Fri.) 10:00> Towards Magnetic 2D Materials 2016.04.27 80316
82 <6/24(Fri.) 1:30pm>Emergent geometry from field theory: Wilson's renormalization group revisited 2016.06.20 65684
81 <7/12(Tue.) 11:00> Spin-direction-dependent magnetoelastic coupling on MnO, CoO, and NiO file 2016.07.01 71763
80 <7/15(Fri.) 14:00> Electronic quasiparticles in the quantum dimer model 2016.07.12 68146
79 <7/15(Fri.) 11:00> Observation of a field induced quantum spin liquid in α-RuCl3 2016.07.14 63650
78 <7/18(Mon.) 14:00> GEANT4 Particle Physics Simulation Software: A Brief Overview From a User’s Perspective 2016.07.15 64691
77 <8/5(Fri.) 10:30> Phase Slips in Superfluid Spin Transport in Magnetic Wires 2016.08.02 55664