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Resonant X-ray Scattering Study of Anisotropic Charge Distribution of Gd Ions in GdB4
Sangyun Hwang,Byeong-Gwan Cho,Tae-Young Koo,Sungdae Ji,Beongki Cho,Ki Bong Lee 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.6
Temperature dependence of anisotropic tensor susceptibility (ATS) scattering intensities of GdB4 were measured near L-edges of Gd to investigate how spin ordering affects ATS. ATS scattering intensities for L2- and L3-edges show different temperature dependence below TN. At L3-edge the intensities reflect spin order parameter while intensities at L2-edge do not show noticeable change. The difference is explained in terms of spin-orbit coupling and isotropic distribution of spin-polarized 5d states of Gd ions. Above TN ATS scattering intensities demonstrate that thermal motions enhance charge distribution anisotorpy of Gd 5d states in paramagnetic phase.
Sangyun Hwang,Changyong Song,Byeong-Gwan Cho,Taeyeong Koo,Sungdae Ji,Beongki Cho,Ki Bong Lee 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.6
Strongly intertwined interaction among spin, orbital and charge degrees of freedom is the essence to induce emergent materials properties, and the investigation to understand their interplay has been actively pursued. In particular, resonant X-ray scattering technique has demonstrated powerful applications in unveiling their long-range ordering behavior with its enhanced sensitivity to the aforementioned degree of freedom. Here, we further demonstrated the spectroscopic application of the technique by providing experimental evidence to reveal spin polarizations in 4f and 5d orbital of the magnetic Tm ions with the orbital-selectivity, which introduced a route to understand fundamental mechanism of spin polarization in the compound. The enhanced sensitivity of the resonant X-ray scattering to various electric multipole transitions expects to find strong applications in studying various spin and polar ordering in materials to include high-order moments.
Korotcenkov, Ghenadii,Gulina, Larisa B.,Cho, Beongki,Brinzari, Vladimir,Tolstoy, Valery P. International Union of Pure and Applied Chemistry 2014 Pure and Applied Chemistry Vol. No.
<P><B>Abstract</B></P><P>The ability of successive ionic layer deposition (SILD) technology to synthesize gold clusters on the surface of tin(IV) oxide and indium(III) oxide films is discussed. It was shown that during the process, concentration of active sites that are capable of absorbing gold ions, and the size of the gold particles thus formed, may be controlled by both concentration of the solutions used and the number of SILD cycles. Thus, SILD methodology, employing separate and multiple stages of adsorption and reduction of adsorbed species, has considerable potential for customizing the properties of the deposited metal nanoparticles. In particular, it is shown that during the deposition of gold nanoparticles on the surface of tin(IV) oxide and indium(III) oxide films by SILD methodology, conditions can be realized under which the size of gold nanoclusters may be controllably varied between 1-3 nm and 50 nm. A model is proposed for the formation of gold clusters during the SILD process.</P>
Nguyen, Thi Huyen,Nguyen, Thi Minh Hien,Kang, Boyoun,Cho, Beongki,Park, Yeonju,Jung, Young Mee,Yang, In-Sang Elsevier 2018 Journal of molecular structure Vol.1165 No.-
<P><B>Abstract</B></P> <P>2D correlation analysis (2DCOS) and principal component analysis (PCA) have been performed on temperature-dependent Raman spectra from 12 K to 300 K of SmB<SUB>6</SUB> single crystals grown from Boron with a purity of 99.9% (3N) or 99.9999% (6N). Significant differences in the Raman spectra of SmB<SUB>6</SUB>(3N) and SmB<SUB>6</SUB>(6N) are observed. The Raman active T<SUB>2g</SUB>, E<SUB>g</SUB>, and A<SUB>1g</SUB> modes of SmB<SUB>6</SUB>(3N) are broader and shift to higher wavenumbers compared with those of SmB<SUB>6</SUB>(6N). The results of 2DCOS and PCA on temperature-dependent Raman spectra of SmB<SUB>6</SUB>(3N) and SmB<SUB>6</SUB>(6N) give us further information. We find that all the T<SUB>2g</SUB>, E<SUB>g</SUB>, and A<SUB>1g</SUB> modes of SmB<SUB>6</SUB>(6N) are single bands, while those of SmB<SUB>6</SUB>(3N) show all doublet features. The appearance of multiple bands in Raman vibrational modes of SmB<SUB>6</SUB>(3N) sample implies that the structure of boron octahedra of the SmB<SUB>6</SUB>(3N) has lower symmetry than that of SmB<SUB>6</SUB>(6N). Our findings in 2DCOS and PCA of the Raman spectra strongly support the differences in the behavior of SmB<SUB>6</SUB>(3N) and SmB<SUB>6</SUB>(6N).</P> <P><B>Highlights</B></P> <P> <UL> <LI> The symmetry of the boron octahedra in SmB<SUB>6</SUB> is found to be lowered by small amount of impurities in boron ingredient. </LI> <LI> Raman spectra of SmB<SUB>6</SUB> single crystals strongly depend on the Boron purity. </LI> <LI> 2DCOS and PCA show the multiple bands in the Raman modes of SmB6 made of 99.9% (3N) boron. </LI> </UL> </P>
Warping effects in the band and angular-momentum structures of the topological insulator Bi2Te3
Jung, Wonsig,Kim, Yeongkwan,Kim, Beomyoung,Koh, Yoonyoung,Kim, Chul,Matsunami, Masaharu,Kimura, Shin-ichi,Arita, Masashi,Shimada, Kenya,Han, Jung Hoon,Kim, Juyoung,Cho, Beongki,Kim, Changyoung American Physical Society 2011 Physical review. B, Condensed matter and materials Vol.84 No.24