Sungkyun Choi

activity

20132023

most citedA new spin-anisotropic harmonic honeycomb iridate

267 citations · 1.1k across the 16 of their papers we have counts for

collaborators

16 papers

cond-mat.str-el2023★ 10 cited

Noncollinear magnetic order, in-plane anisotropy, and magnetoelectric coupling in a pyroelectric honeycomb antiferromagnet Ni $_{2}$ Mo $_{3}$ O $_{8}$

Poonam Yadav, Suheon Lee, G. L. Pascut +7

Ni $_{2}$ Mo $_{3}$ O $_{8}$ is a pyroelectric honeycomb antiferromagnet exhibiting peculiar changes of its electric polarization at magnetic transitions. Ni $_{2}$ Mo $_{3}$ O $_{8}$ stands…

cond-mat.str-el2023★ 10 cited

Partial molecular orbitals in face-sharing 3 $d$ manganese trimer: Comparative studies on Ba $_{4}$ TaMn $_{3}$ O $_{12}$ and Ba $_{4}$ NbMn $_{3}$ O $_{12}$

Anzar Ali, Heung-Sik Kim, Poonam Yadav +3

We present a molecular orbital candidate Ba $_{4}$ TaMn $_{3}$ O $_{12}$ with a face-sharing octahedra trimer, by comparing it with a related compound Ba $_{4}$ NbMn $_{3}$ O $_{12}$ . The sy…

cond-mat.str-el2022★ 7 cited

Spectral signatures of a unique charge density wave in Ta $_{2}$ NiSe $_{7}$

Matthew D. Watson, Alex Louat, Cephise Cacho +4

Charge Density Waves (CDW) are commonly associated with the presence of near-Fermi level states which are separated from others, or "nested", by a wavector of $q$ . Here we…

cond-mat.str-el2022★ 5 cited

Collective magnetic Higgs excitation in a pyrochlore ruthenate

Dirk Wulferding, Junkyeong Kim, Mi Kyung Kim +13

The emergence of scalar Higgs-type amplitude modes in systems where symmetry is spontaneously broken has been a highly successful, paradigmatic description of phase transitions, wi…

cond-mat.str-el2021★ 10 cited

Lattice dynamics and structural transition of the hyperhoneycomb iridate $β$ -Li $_{2}$ IrO $_{3}$ investigated by high-pressure Raman scattering

Sungkyun Choi, Heung-Sik Kim, Hun-Ho Kim +8

We report a polarized Raman scattering study of the lattice dynamics of $β$ -Li $_{2}$ IrO $_{3}$ under hydrostatic pressures up to 7.62 GPa. At ambient pressure, $β$ -Li $_{2}$ IrO $_{3}$ exhibit…

cond-mat.str-el2020★ 17 cited

Noncollinear antiferromagnetic order in the buckled honeycomb lattice of magnetoelectric Co4Ta2O9 determined by single-crystal neutron diffraction

Sungkyun Choi, Dong Gun Oh, Matthias J. Gutmann +8

Co4Ta2O9 exhibits a three-dimensional magnetic lattice based on the buckled honeycomb motif. It shows unusual magnetoelectric effects, including the sign change and non-linearity.…

cond-mat.supr-con2019★ 25 cited

Selective formation of apical oxygen vacancies in La $_{2 - x}$ Sr $_{x}$ CuO $_{4}$

Gideok Kim, Georg Christiani, Gennady Logvenov +4

The superconducting properties of high-\tc\ materials are functions of carriers concentration, which is controlled by the concentration of defects including heterovalent cations, i…

cond-mat.str-el2019★ 1 cited

Highly nonlinear magnetoelectric effect in antiferromagnetic Co4Ta2O9 single crystals

Nara Lee, Dong Gun Oh, Sungkyun Choi +10

Strongly correlated materials with multiple order parameters provide unique insights into the fundamental interactions in condensed matter systems and present opportunities for inn…

cond-mat.str-el2019★ 32 cited

Spectroscopic and first principle DFT+eDMFT study of complex structural, electronic, and vibrational properties of $M_{2}$ Mo $_{3}$ O $_{8}$ ( $M$ =Fe, Mn) polar magnets

T. N. Stanislavchuk, G. L. Pascut, A. P. Litvinchuk +8

Optical spectroscopy, X-ray diffraction measurements, density functional theory (DFT) and density functional theory + embedded dynamical mean field theory (DFT+eDMFT) have been use…

cond-mat.str-el2018★ 35 cited

Spin dynamics and field-induced magnetic phase transition in the honeycomb Kitaev magnet $α$ -Li $_{2}$ IrO $_{3}$

Sungkyun Choi, S. Manni, J. Singleton +7

The layered honeycomb iridate $α$ -Li $_{2}$ IrO $_{3}$ displays an incommensurate magnetic structure with counterrotating moments on nearest-neighbor sites, proposed to be stabilized by s…

cond-mat.str-el2018★ 13 cited

Structural investigation of the insulator-metal transition in NiS $_{2 - x}$ Se $_{x}$ compounds

Garam Han, Sungkyun Choi, Hwanbeom Cho +3

We report on a combined measurement of high-resolution x-ray diffraction on powder and Raman scattering on single crystalline NiS2-xSex samples that exhibit the insulator-metal tra…

cond-mat.str-el2016★ 183 cited

Incommensurate Counterrotating Magnetic Order Stabilized by Kitaev Interactions in the Layered Honeycomb $α$ -Li $_{2}$ IrO $_{3}$

S. C. Williams, R. D. Johnson, F. Freund +8

The layered honeycomb magnet $α$ -Li $_{2}$ IrO $_{3}$ has been theoretically proposed as a candidate to display novel magnetic behaviour associated with Kitaev interactions between spin-o…

cond-mat.str-el2014★ 163 cited

Unconventional magnetic order on the hyperhoneycomb Kitaev lattice in $β$ -Li2IrO3: full solution via magnetic resonant x-ray diffraction

A. Biffin, R. D. Johnson, Sungkyun Choi +6

The recently-synthesized iridate $β$ -Li $_{2}$ IrO $_{3}$ has been proposed as a candidate to display novel magnetic behavior stabilized by frustration effects from bond-dependent, anisot…

cond-mat.mtrl-sci2014★ 267 cited

A new spin-anisotropic harmonic honeycomb iridate

Kimberly A. Modic, Tess E. Smidt, Itamar Kimchi +14

The physics of Mott insulators underlies diverse phenomena ranging from high temperature superconductivity to exotic magnetism. Although both the electron spin and the structure of…

cond-mat.str-el2014★ 244 cited

Kitaev interactions between j=1/2 moments in honeycomb Na2IrO3 are large and ferromagnetic: insights from ab initio quantum chemistry calculations

Vamshi M. Katukuri, S. Nishimoto, V. Yushankhai +7

Na $_{2}$ IrO $_{3}$ , a honeycomb 5 $d^{5}$ oxide, has been recently identified as a potential realization of the Kitaev spin lattice. The basic feature of this spin model is that for each o…

cond-mat.str-el2013★ 53 cited

Effect of isoelectronic doping on honeycomb lattice iridate A_2IrO_3

S. Manni, Sungkyun Choi, I. I. Mazin +5

We have investigated experimentally and theoretically the series (Na $_{1 - x}$ Li $_{x}$ ) $_{2}$ IrO $_{3}$ . Contrary to what has been believed so far, only for $x \leq 0.25$ the system for…

Noncollinear magnetic order, in-plane anisotropy, and magnetoelectric coupling in a pyroelectric honeycomb antiferromagnet Ni2​Mo3​O8​

Partial molecular orbitals in face-sharing 3d manganese trimer: Comparative studies on Ba4​TaMn3​O12​ and Ba4​NbMn3​O12​

Spectral signatures of a unique charge density wave in Ta2​NiSe7​

Collective magnetic Higgs excitation in a pyrochlore ruthenate

Lattice dynamics and structural transition of the hyperhoneycomb iridate β-Li2​IrO3​ investigated by high-pressure Raman scattering