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 1078945
246 <Oct.20(Tue) 16:00> Electromagnetic Response and Thermomagnetic Instabilities in Three-Dimensional Nanostructured Superconductors file 2015.10.15 100393
245 <Oct. 28(Wed.) 4:30 PM> Anomalous diffusion of single-molecules in living cells: at the interface of biology and statistical physics 2015.10.19 110288
244 <Oct.20(Tue) 10:00-12:00> Novel quantum transport in Weyl semimetals and double-Weyl semimetals 2015.10.23 90358
243 <Nov. 4(Wed.) 4:30 PM> 기능성 산화물과 그래핀을 접합한 나노소자의 특성 변화 2015.10.30 60677
242 <Nov.13(Fri) 16:00> Kondo screening in mixed valence and heavy fermion compounds and the signatures of Nozieres’ exhaustion 2015.11.04 129773
241 <Nov. 11(Wed.) 4:30 PM> 그래핀 산업의 현황과 전망 2015.11.09 63108
240 <Nov. 18(Wed.) 4:30 PM> Single-molecule chemistry and spectroscopy on ultrathin insulating films 2015.11.11 182875
239 <Nov. 25(Wed.) 4:30 PM> Present and Future of OLED 2015.11.19 74840
238 <Dec. 2(Wed.) 4:30 PM> Next-generation solar cells for high photo-conversion efficiency 2015.11.25 102051
237 <Dec. 9(Wed.) 4:30 PM>Direct detection of dark matter at Underground 2015.12.03 75399
236 <Dec.30(Wed) 16:30> Some basics about the thermoelectricity; the semi-classical Boltzmann transport approach 2015.12.24 68756
235 2016학년도 1학기 콜로퀴움 일정 2016.02.03 133728
234 <March 8(Tue) 18:00> Unsolved puzzles of Gamma-Ray Bursts 2016.03.03 71528
233 <March. 9(Wed.) 4:30 PM>가치 있는 대학 생활이란 무엇인가? file 2016.03.07 56203
232 <March. 16(Wed.) 4:30 PM> 초고속반도체의 블랙다이아몬드™,low-k 2016.03.10 73942
» <March.18(Fri) 11:00> High Pressure Synthesis and Characterization of Non-Oxide Superconductors 2016.03.14 69135
230 <March. 23(Wed.) 4:30 PM> 조선시대의 천문시계 2016.03.17 57219
229 <March.24(Thu) 14:00> A new boson and muon g-2 2016.03.17 66997
228 <March. 30(Wed.) 4:30 PM> Tetraneutron (four-neutron nucleus) 2016.03.24 70410
227 <April. 6(Wed.) 4:30 PM> Quantitative Determination of High Tc Superconductivity Mechanism 2016.03.31 142085