Eunsung's paper published in Applied Physics Letters

EPSL | 2012.07.25 16:20 | 조회 5351

Congratulation to Eunsung for his paper published in Applied Physics Letters (Appl. Phys. Lett. 101, 042601 (2012)). Below is a brief summary of the article:


Thin film study of the recently discovered Fe-base superconductors is important not only in its application to superconducting (SC) technology, but also in elucidating its mechanism for superconductivity. Strain effects in thin films have been also shown to be an effective way to raise the SC transition temperature beyond its bulk-crystal counterpart. Despite the ever growing interest in thin film study, however, high volatility of the constituent elements of the Fe-based superconductors makes it difficult to fabricate high-quality thin films, especially for the hole-doped ones. This Letter reports the pressure dependence of the superconducting properties of K-doped BaFe2As2 thin films (optimally hole doped) on the LaAlO3 substrate, where Tc is 39.95 K, the SC transition width is 1.30 K, and RRR = 38, indicating high quality of the film. Unlike single crystals with similar stoichiometry, Tc of the thin film with optimal potassium concentration gradually increases to 40.8 K at 11.8 kbar (Pc), the highest for this compound, and decreases with further increasing pressure, showing a dome shape. The unusual pressure dependence of the Tc is ascribed to lattice mismatch between the LAO substrate and thin film, where applied hydrostatic pressure effectively acts as the uniaxial pressure along the crystalline c-axis of the film. Observation of a funnel-shape topology of the resistivity near the optimal pressure Pc indicates that the high-temperature superconductivity in this compound is relevant to the quantum fluctuations from a quantum critical point at Pc. Through the systematic control of external applied pressure, the current work paves a way to sensitively study the effects of the substrate to the high SC transition temperature in the thin films and its SC mechanism.

twitter facebook me2day 요즘
번호 제목 글쓴이 조회 날짜
공지 [Special seminar] Dr. Eun-Mi Choi CQMS 7125 2019.08.13 13:58
공지 [CQMS End of Year Party] CQMS 11550 2017.12.30 14:13
18 The International Conference on STRONGLY 첨부파일 이상연 7729 2013.02.15 11:02
17 10th Superconductivity Foundation Course 사진 첨부파일 이상연 7609 2013.02.15 10:59
16 Sangyun, Soohyeon and Dongwon`s Poster A 사진 첨부파일 이상연 8424 2012.11.01 10:19
15 KPS 가을학술논문 발표회 (10/24~10/26) EPSL 6928 2012.09.22 13:09
14 Sangyun's article published in Physics & EPSL 5581 2012.09.13 16:11
>> Eunsung's paper published in Applied Phy EPSL 5352 2012.07.25 16:20
12 Soonbeom's First Paper Published in Phys EPSL 5462 2012.06.20 10:47
11 ICHN2012 - International Conference on H EPSL 6881 2012.06.11 20:12
10 Special Seminar by Prof. Sonia Haddad EPSL 5453 2012.06.11 20:06
9 Job Openings for CQMS EPSL 13902 2012.05.31 14:03
8 2012 BK 석학 초청 특별 강연 - Prof Greg Stewart EPSL 6219 2012.05.16 20:00
7 Awards in KPS 2011 Fall Meeting EPSL 5619 2012.04.02 13:18
6 2011 초전도 100주년 기념 논문 선정 EPSL 5897 2012.04.02 13:16
5 Solly won the best presentation award in EPSL 5036 2012.04.02 13:15
4 EPSL Paper Featured as Cover Page for Ph EPSL 5512 2012.04.02 13:14
3 Prof. Park Awarded POSCO Science Fellow EPSL 6304 2012.04.02 13:13
2 2008 JPCM Top Paper 선정 EPSL 5497 2012.04.02 13:12
1 Notice 게시판이 리뉴얼 되었습니다. EPSL 5342 2012.02.28 16:11