423 citations · 3.8k across the 61 of their papers we have counts for
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Surface reconstruction and charge modulation in BaFe2As2 superconducting film
S. Kim, S. Yi, M. Oh +13
Whether or not epitaxially grown superconducting films have the same bulk-like superconducting properties is an important concern. We report the structure and the electronic proper…
Interplay of charge density wave and multiband superconductivity in 2-PdTaSe
D. Bhoi, S. Khim, W. Nam +6
2-TaSe has been one of unique transition metal dichalcogenides exhibiting several phase transitions due to a delicate balance among competing electronic ground states. An un…
Enhanced Upper Critical Fields in a New Quasi-one-dimensional Superconductor Nb2PdxSe5
Seunghyun Khim, Bumsung Lee, Ki-Young Choi +9
We report a discovery of superconductivity with Tc = 5.5 K in Nb2PdxSe5, in which one-dimensional (1D) Nb-Se chains existing along the b-direction hybridize each other to form the…
Orbital selective Fermi surface shifts and mechanism of high T superconductivity in correlated AFeAs (A=Li,Na)
Geunsik Lee, Hyo Seok Ji, Yeongkwan Kim +9
Based on the dynamical mean field theory (DMFT) and angle resolved photoemission spectroscopy (ARPES), we have investigated the mechanism of high superconductivity in stoichi…
Probing the Order Parameter of Superconducting LiFeAs using Pb/LiFeAs and Au/LiFeAs Point-Contact Spectroscopy
Xiaohang Zhang, Bumsung Lee, Seunghyun Khim +3
We have fabricated c-axis point contact junctions between high-quality LiFeAs single crystals and Pb or Au tips in order to study the nature of the superconducting order parameter…
Magnetic field - dependent Labusch parameter in LiFeAs superconductor from Campbell penetration depth
Plengchart Prommapan, Makariy A. Tanatar, Bumsung Lee +3
A true critical current density, , as opposite to commonly measured relaxed persistent (Bean) current, , was extracted from the Campbell penetration depth, $λ_{C}(T,H…
Pauli-limiting effects in the upper critical fields of a clean LiFeAs single crystal
Seunghyun Khim, Bumsung Lee, Jae Wook Kim +3
We have investigated the temperature-dependence of the upper critical field Hc2(T) in a LiFeAs single crystal by direct measurements of resistivity under static magnetic fields up…
Single crystal growth and superconducting properties of LiFeAs
Bumsung Lee, Seunghyun Khim, Jung Soo Kim +2
We report the successful growth of high quality single crystals of LiFeAs with lateral sizes up to 5 x 5 mm2 by the Sn-flux method. Electrical resistivity studies reveal that the s…
Electron-hole asymmetry in Co- and Mn-doped SrFe2As2
J. S. Kim, Seunghyun Khim, H. J. Kim +5
Phase diagram of electron and hole-doped SrFe2As2 single crystals is investigated using Co and Mn substitution at the Fe-sites. We found that the spin-density-wave state is suppres…
Evidence of a universal and isotropic 2Δ/kBTC ratio in 122-type iron pnictide superconductors over a wide doping range
Xiaohang Zhang, Yoon Seok Oh, Yong Liu +8
We have systematically investigated the doping and the directional dependence of the gap structure in the 122-type iron pnictide superconductors by point contact Andreev reflection…
Nearly isotropic upper critical fields in a SrFeCoAs single crystal
Seunghyun Khim, Jun Sung Kim, Jae Wook Kim +4
We study temperature dependent upper critical field of a SrFeCoAs single crystal (\textit{T}=20.2 K) along \textit{ab}-plane and \textit{c}…
Evidence for dominant Pauli paramagnetic effect in the upper critical fields of a FeTe0.6Se0.4 superconductor
Seunghyun Khim, Jae Wook Kim, Eun Sang Choi +4
We investigate temperature-dependence of the upper critical fields Hc2(T) of a superconducting FeTe0.6Se0.4 single crystal by measuring resistivity in static magnetic fields up to…
Coupling of localized moments and itinerant electrons in EuFe2As2 single crystals studied by Electron Spin Resonance
E. Dengler, J. Deisenhofer, H. -A. Krug von Nidda +6
Electron spin resonance measurements in EuFe2As2 single crystals revealed an absorption spectrum of a single resonance with Dysonian lineshape. Above the spin-density wave transiti…
Josephson effect between electron-doped and hole-doped iron pnictide single crystals
Xiaohang Zhang, Shanta Saha, Nicholas P. Butch +8
We have observed the Josephson effect in junctions formed between single crystals of SrFe1.74Co0.26As2 and Ba0.23K0.77Fe2As2. I-V curves showed resistively-shunted junction charact…
Evidence for Coexistence of Superconductivity and Magnetism in Single Crystals of Co-doped SrFeAs
Jun Sung Kim, Seunghyun Khim, Liqin Yan +5
In order to investigate whether magnetism and superconductivity coexist in Co-doped SrFeAs, we have prepared single crystals of SrFeCoAs, = 0 and 0.4, a…
Observation of the Josephson effect in Pb/(Ba,K)Fe2As2 single crystal junctions
Xiaohang Zhang, Yoon Seok Oh, Yong Liu +4
We have fabricated c-axis Josephson junctions on single crystals of (Ba,K)Fe2As2 by using Pb as the counter electrode in two geometries, planar and point contact. Junctions in both…
Current-voltage characteristics of NdFeAsO0.85F0.15 and NdFeAsO0.85 superconductors
Yong Liu, Yi Sheng Chai, Hyeong-Jin Kim +4
The vortex phase diagrams of NdFeAsO0.85F0.15 and NdFeAsO0.85 superconductors are determined from the analysis of resistivity and current-voltage (I-V) measurements in magnetic fie…
Vortex-glass phase transition and superconductivity in an under- doped (Ba,K)Fe2As2 single crystal
Hyeong-Jin Kim, Yong. Liu, Yoon Seok Oh +4
Measurements of magnetotransport and current-voltage (I-V) characteristics up to 9 T were used to investigate the vortex phase diagram of an under-doped Measurements of magnetotran…
Very high upper critical fields in MgB2 produced by selective tuning of impurity scattering
A. Gurevich, S. Patnaik, V. Braccini +16
We report a significant enhancement of the upper critical field of different samples alloyed with nonmagnetic impurities. By studying films and bulk polycrystals w…