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Structure, strain, and the ground state of the LaTiO3/LaAlO3superlattice
Lee, Alex Taekyung,Han, Myung Joon American Physical Society 2014 Physical review. B, Condensed matter and materials Vol.89 No.11
The first-principles density functional theory calculations have been performed to understand LaTiO3/ LaAlO3 superlattice. By taking into account of the structural distortions, U dependence, and the exchange correlation functional dependence, we show that the ferromagnetic spin and antiferro-orbital ordering is stabilized in the wide range of strains, which is notably different from the previous reports on the titanate systems. The ground-state spin and orbital configurations critically depend on the structural properties. Our results suggest a possible strain control of the magnetic property in transition-metal oxide heterostructures.
Yoon, Hana,Lee, Alex Taekyung,Choi, Eun-Ae,Seo, Kwanyong,Bagkar, Nitin,Cho, Jaehun,Jo, Younghun,Chang, K. J.,Kim, Bongsoo American Chemical Society 2010 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.132 No.49
<P>Single-crystalline free-standing hexagonal Fe<SUB>1.3</SUB>Ge nanowires (NWs) are synthesized for the first time using a chemical vapor transport process without using any catalyst. Interestingly, Fe<SUB>1.3</SUB>Ge NWs are found to be ferromagnetic at room temperature, while bulk Fe<SUB>1.3</SUB>Ge has the lower critical temperature of 200 K. We perform first-principles density functional calculations and suggest that the observed strong ferromagnetism is attributed to the reduced distances between Fe atoms, increased number of Fe−Fe bonds, and the enhanced Fe magnetic moments. Both experimental and theoretical studies show that the magnetic moments are enhanced in the NWs, as compared to bulk Fe<SUB>1.3</SUB>Ge. We also modulate the composition ratio of as-grown iron germanide NWs by adjusting experimental conditions. It is shown that uniaxial strain on the hexagonal plane also enhances the ferromagnetic stability.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2010/jacsat.2010.132.issue-49/ja104189p/production/images/medium/ja-2010-04189p_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja104189p'>ACS Electronic Supporting Info</A></P>
Pairing enhancement by interfacial phonons in a bulk crystal of perovskite-clad FeAs monolayers
Won-Jun JANG,Seokhwan CHOI,Hyunjung LEE,Jong Mok OK,Hyunwoo CHOI,Alex Taekyung LEE,Alireza AKBARI,Hwansoo SUH,Jayong KU,Yannis SEMERTZIDIS,Yunkyu BANG,Jun Sung KIM,Jhinhwan LEE 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8