<3/18(Fri),11:00>Special Talk by Dr.Sathish

CQMS | 2016.03.14 13:53 | 조회 13654
 

<Inforamation>

 

1. Date and Time : 2016. 03. 18 (Fri) at 11:00

 

2. Place :  Presentation Room on 2nd floor, Samsung Library

 

3. Invited speaker : Dr.Sathishi (The Seoul University)

 

4. Title : High Pressure Synthesis and Characterization of Non-Oxide Superconductors

 

5. 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.

twitter facebook me2day 요즘
40개(1/2페이지)
NOTICE
번호 제목 글쓴이 조회 날짜
공지 [Special seminar] Dr. Eun-Mi Choi [6] CQMS 9226 2019.08.13 13:58
공지 [CQMS End of Year Party] CQMS 13485 2017.12.30 14:13
38 [Special seminar] Hyun-Jung Lee from POS CQMS 8664 2017.12.19 17:39
37 [Physics Journal Club] -2017.04.11 [3] CQMS 11082 2017.04.10 21:32
36 [CQMS Seminar] -2016.10.25 [1] CQMS 14114 2016.10.10 16:26
35 [CQMS Seminar] -2016.10.12 [1] CQMS 12693 2016.10.10 13:15
>> <3/18(Fri),11:00>Special Talk by Dr.Sath [1] CQMS 13655 2016.03.14 13:53
33 Education Minister Award Recipient - Soo [2] CQMS 15330 2016.01.07 11:37
32 <10/20(Tue) 16:00> Special talk by prof. CQMS 14648 2015.10.19 16:57
31 <2/09(Mon) 11:00>Special seminar by Cris CQMS 26734 2015.02.06 20:01
30 Undergraduate Students Funded by Nationa 첨부파일 [1] EPSL 13733 2014.06.09 17:24
29 Special Seminar by Dr.Lee(KIAS) [1] EPSL 12707 2014.04.03 11:31
28 <2/28(Fri) 14:00> Special seminar by Dr. EPSL 11613 2014.02.27 12:45
27 The Fifth International Workshop on the EPSL 11067 2014.02.06 15:04
26 답글 RE:The Fifth International Workshop on t EPSL 7830 2014.02.07 02:20
25 Soonbeom's paper- cover figure and News [1] EPSL 8305 2014.02.01 01:34
24 Soonbeom's Paper Published in Nature Phy [1] EPSL 8153 2014.01.15 22:00
23 CQMS special seminar by Dr.Park(POSTECH) [1] EPSL 7536 2013.12.11 11:10
22 Special seminar by Dr.Prathiba (SKKU) [2] EPSL 8411 2013.12.03 12:00
21 Best Poster Award in KPS 2013 Fall meeti 첨부파일 EPSL 10996 2013.11.06 14:38
20 <8/27(Tue) 11:00> Special seminar by Dr. EPSL 7562 2013.08.26 14:53
19 <7/25(Thu) 11:00> Special seminar by Pro EPSL 7311 2013.07.24 11:53