Home > 게시판 > 세미나
양자물질초전도체창의연구소에서 최은미 박사님을 초청하여 아래와 같이 세미나를 개최합니다.
학과 구성원 여러분의 많은 참석을 부탁드립니다.
○ Date/time: 2019. 08. 14(Wed.) 11:00
○ Place: 삼성학술정보관 7층
○ Speaker: 최 은 미 박사 (前)Post-Doctoral researcher, University of Cambridge, UK)
○ Title: 3D-strain induced superconductivity in La2CuO4+δ using a simple vertically aligned nanocomposite approach
○ Abstract: A long-term goal for superconductors is to increase the superconducting transition temperature, TC. In cuprates, TC depends strongly on the out-of-plane Cu-apical oxygen distance, and the in-plane Cu-O distance. High out-of-plane and the in-plane parameters are both individually linked to higher TC, but to date they have not been achieved together.
Herein, I introduce a simple and unique self-assembled approach to 3D-strain engineering. In simply-grown, self-assembled, vertically aligned thin film nanocomposite (VAN) thin films of La2CuO4+δ+LaCuO3 grown on SrTiO3, by strongly increasing the out-of-plane distances without reducing in-plane distances, we achieve superconductivity up to 50 K. Our VAN approach leads to strong vertical strain of ~50 nm La2CuO4+δ nanopillars by a LaCuO3 matrix in which the La2CuO4+δ is embedded. The LaCuO3 expands the La2CuO4+δ out-of-plane along the interfaces spaced every ~50 nm, the strained region spreading ~10 nm laterally from each interface. A TC of 50 K has only been achieved before at single atomic layer interfaces in complex heterostructures. Otherwise, in plain or doped La2CuO4+δ films, TC is 35 K or below. In addition, no additional process to supply excess oxygen, e.g. by ozone annealing, was required as is the case for La2CuO4+δ films studied previously. Our work represents a new, self-assembled approach to 3D-strain engineering of cuprates to enhance TC. Our proof-of-concept work represents an entirely new approach to increasing TC in cuprates or other superconductors.1
In addition, I introduce our promising result of weak magnetic signatures of superconductivity up to 120 K from DC magnetic susceptibility measurements, which can be turned on and off by changing oxygen content.
1. Choi, E.-M. et al. 3D strain-induced superconductivity in La2CuO4+δ using a simple vertically aligned nanocomposite approach. Sci. Adv. 5, eaav5532 (2019).
|공지||<12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생||2016.11.28||1060432|
|602||<9/24(Tue) 4:00 pm ~ > Structure Formation with Two Periods of Inflation: Beyond plain LCDM||2019.09.17||48759|
|601||<Sept.18(Wed.)> Rare-earth: versatility and capability||2019.09.16||78762|
|600||<9/17(Tue) 4:00 pm ~ >Dynamics of multiple-Q spin textures and its effect on electronic state||2019.09.10||62414|
|599||<Sept.11(Wed.)> Fantastic physics and materials, how to find them?||2019.09.06||74718|
|598||<9/2(Mon) 15:00 ~ >Status of the KM3NeT Deep Sea Neutrino Telescope||2019.08.26||73887|
|597||<8/30(Fri) 16:00 ~ >Structures of light neutron-rich nuclei, 17,19C||2019.08.22||81062|
|596||<8/26(Mon) 14:00 ~ >Constructing viable models of bouncing scenarios||2019.08.20||55715|
|595||<8/19(Mon) 13:30 ~ >Detection of cosmic rays in the PeV to EeV energy range||2019.08.16||84969|
|»||<8/14(Wed.)>3D-strain induced superconductivity in La2CuO4+δ using a simple vertically aligned nanocomposite approach||2019.08.13||64817|
|593||<8/19(Mon) 14:00 ~ >Exploring topological matter in an atomic quantum simulator||2019.07.26||74638|
|592||2019학년도 2학기 콜로퀴움 일정||2019.07.17||425108|
|591||<June.12(Wed.)> Ribocomputing: Cellular Logic Computation using RNA Devices||2019.06.07||219336|
|590||<June.5(Wed.)> Fluid gravity duality||2019.05.29||59798|
|589||<May.22(Wed.)> Introduction to exotic quantum states in solids||2019.05.15||72134|
|588||<May.15(Wed.)> Three-body problems and three-body forces in Classic and Quantum Systems||2019.05.08||67104|
|587||<5/16(Thu.) 14:00 ~ >The Chiral anomaly without Landau levels||2019.05.08||117948|
|586||<May.8(Wed.)> Genesis of Matter||2019.05.01||41366|
|585||<May.1(Wed.)> Introduction of AMS Application||2019.04.24||63656|
|584||<April.17(Wed.)> Emerging Artificial Synapse for Learning- and Energy-Efficient Neuromorphic System||2019.04.11||122899|
|583||<April.10(Wed.)> 자성 반데르발스 물질 발견과 전망(Discovery and Perspective of magnetic van der Waals materials)||2019.04.04||47129|