Seunghyun Khim
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View article: Dichotomy of electron-phonon interactions in the delafossite <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>PdCoO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>: From weak bulk to polaronic surface coupling
Dichotomy of electron-phonon interactions in the delafossite : From weak bulk to polaronic surface coupling Open
The metallic delafossites host ultrahigh-mobility carriers in the bulk, while at their polar surfaces, intrinsic electronic reconstructions stabilize markedly distinct electronic phases, from charge-disproportionated insulators to Rashba-s…
View article: Phase diagram of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>CeRh</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>As</mml:mtext><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> for out-of-plane magnetic field
Phase diagram of for out-of-plane magnetic field Open
The heavy-fermion superconductor (SC) CeRh2As2 (Tc = 0.35 K) shows two SC phases SC1 and SC2 when a magnetic field is applied parallel to the c axis of the tetragonal unit cell. All experiments to date have indicated that the change in SC …
View article: Adsorbate-induced formation of a surface-polarity-driven nonperiodic superstructure
Adsorbate-induced formation of a surface-polarity-driven nonperiodic superstructure Open
View article: Size-restricted magnetotransport in the delafossite metals PdCoO$_2$ and PtCoO$_2$
Size-restricted magnetotransport in the delafossite metals PdCoO$_2$ and PtCoO$_2$ Open
Studies of electronic transport in width-restricted channels of PdCoO$_2$ have recently revealed a novel `directional ballistic' regime, in which ballistic propagation of electrons on an anisotropic Fermi surface breaks the symmetries of b…
View article: Coexistence of local magnetism and superconductivity in the heavy-fermion compound <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CeRh</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> revealed by <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>μ</mml:mi><mml:mi>SR</mml:mi></mml:mrow></mml:math> studies
Coexistence of local magnetism and superconductivity in the heavy-fermion compound revealed by studies Open
The superconducting (SC) state (Tc=0.3K) of the heavy-fermion compound CeRh2As2, which undergoes an unusual field-induced transition to another high-field SC state, emerges from an unknown ordered state below To=0.55K. While an electronic …
View article: Origin of the non-Fermi-liquid behavior in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CeRh</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Origin of the non-Fermi-liquid behavior in Open
Unconventional superconductivity in heavy-fermion systems appears often near magnetic quantum critical points (QCPs). This seems to be the case also for CeRh2As2 (Tc ≈0.31 K). CeRh2As2 shows two superconducting (SC) phases, SC1 and SC2, fo…
View article: Dichotomy of electron-phonon interactions in the delafossite PdCoO$_2$: From weak bulk to polaronic surface coupling
Dichotomy of electron-phonon interactions in the delafossite PdCoO$_2$: From weak bulk to polaronic surface coupling Open
The metallic delafossites host ultra-high mobility carriers in the bulk, while at their polar surfaces, intrinsic electronic reconstructions stabilise markedly distinct electronic phases, from charge-disproportionated insulators, to Rashba…
View article: Appearance of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>c</mml:mi></mml:math>-axis magnetic moment in odd-parity antiferromagnetic state in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CeRh</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> revealed by <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>As</mml:mi><mml:mprescripts/><mml:none/><mml:mn>75</mml:mn></mml:mmultiscripts></mml:math>-NMR
Appearance of -axis magnetic moment in odd-parity antiferromagnetic state in revealed by -NMR Open
CeRh$_2$As$_2$ shows the superconducting (SC) multiphase under the $c$-axis\nmagnetic field, which is considered to originate from local inversion symmetry\nbreaking at the Ce site. We reported that the antiferromagnetic (AFM) order is\nin…
View article: Pressure-Tuned Quantum Criticality in the Locally Noncentrosymmetric Superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>CeRh</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>As</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:mrow></mml:math>
Pressure-Tuned Quantum Criticality in the Locally Noncentrosymmetric Superconductor Open
The unconventional superconductor CeRh2As2 (critical temperature Tc≈0.4 K) displays an exceptionally rare magnetic-field-induced transition between two distinct superconducting (SC) phases, proposed to be states of even and odd parity of …
View article: Exposing the odd-parity superconductivity in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CeRh</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> with hydrostatic pressure
Exposing the odd-parity superconductivity in with hydrostatic pressure Open
Odd-parity superconductivity is a fundamentally interesting but rare state of matter with a potential for applications in topological quantum computing. Crystals with staggered locally noncentrosymmetric structures have been proposed as pl…
View article: Origin of the non-Fermi-liquid behavior in CeRh2As2
Origin of the non-Fermi-liquid behavior in CeRh2As2 Open
Unconventional superconductivity in heavy-fermion systems appears often near magnetic quantum critical points (QCPs). This seems to be the case also for CeRh2As2 (Tc $\approx$ 0.31 K). CeRh2As2 shows two superconducting (SC) phases, SC1 an…
View article: Avoided metallicity in a hole-doped Mott insulator on a triangular lattice
Avoided metallicity in a hole-doped Mott insulator on a triangular lattice Open
View article: Coexistence of local magnetism and superconductivity in the heavy-fermion CeRh$_2$As$_2$ revealed by $μ$SR studies
Coexistence of local magnetism and superconductivity in the heavy-fermion CeRh$_2$As$_2$ revealed by $μ$SR studies Open
The superconducting (SC) state ($T_\mathrm{c}$ = 0.3 K) of the heavy-fermion compound CeRh$_2$As$_2$, which undergoes an unusual field-induced transition to another high-field SC state, emerges from an unknown ordered state below $T_\mathr…
View article: Nonlocal Electrodynamics in Ultrapure <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>PdCoO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Nonlocal Electrodynamics in Ultrapure Open
The motion of electrons in the vast majority of conductors is diffusive, obeying Ohm’s law. However, the recent discovery and growth of high-purity materials with extremely long electronic mean free paths has sparked interest in non-Ohmic …
View article: Investigation of the Hyperfine Coupling Constant of Locally Noncentrosymmetric Heavy-fermion Superconductor CeRh<sub>2</sub>As<sub>2</sub>
Investigation of the Hyperfine Coupling Constant of Locally Noncentrosymmetric Heavy-fermion Superconductor CeRh<sub>2</sub>As<sub>2</sub> Open
We performed $^{75}$As-NMR measurements in $H\parallel ab$ to investigate the normal-state magnetic properties of CeRh$_2$As$_2$, a recently-discovered heavy-fermion superconductor. We compared the NMR Knight shift $K$ with the magnetic su…
View article: Interaction of in-plane Drude carrier with c-axis phonon in PdCoO2
Interaction of in-plane Drude carrier with c-axis phonon in PdCoO2 Open
View article: Exposing the odd-parity superconductivity in CeRh$_2$As$_2$ with hydrostatic pressure
Exposing the odd-parity superconductivity in CeRh$_2$As$_2$ with hydrostatic pressure Open
Odd-parity superconductivity is a fundamentally interesting but rare state of matter with a potential for applications in topological quantum computing. Crystals with staggered locally noncentrosymmetric structures have been proposed as pl…
View article: Pressure-tuned quantum criticality in the locally non-centrosymmetric superconductor CeRh$_2$As$_2$
Pressure-tuned quantum criticality in the locally non-centrosymmetric superconductor CeRh$_2$As$_2$ Open
The unconventional superconductor CeRh$_2$As$_2$ (critical temperature $T_{\mathrm{c}}\approx0.4\,\mathrm{K}$) displays an exceptionally rare magnetic-field-induced transition between two distinct superconducting (SC) phases, proposed to b…
View article: Avoided metallicity in a hole-doped Mott insulator on a triangular lattice
Avoided metallicity in a hole-doped Mott insulator on a triangular lattice Open
Doping of a Mott insulator gives rise to a wide variety of exotic emergent states, from high-temperature superconductivity to charge, spin, and orbital orders. The physics underpinning their evolution is, however, poorly understood. A majo…
View article: Investigation of Planckian behavior in a high-conductivity oxide: PdCrO <sub>2</sub>
Investigation of Planckian behavior in a high-conductivity oxide: PdCrO <sub>2</sub> Open
The layered delafossite metal PdCrO is a natural heterostructure of highly conductive Pd layers Kondo coupled to localized spins in the adjacent Mott insulating CrO layers. At high temperatures, T , it has a T -linear resistivity whi…
View article: Interaction of in-plane Drude carrier with c-axis phonon inPdCoO2
Interaction of in-plane Drude carrier with c-axis phonon inPdCoO2 Open
We performed polarized reflection and transmission measurements on the layered conducting oxide PdCoO 2 thin films. For the ab-plane, an optical peak near Ω ≈ 750 cm−1 drives the scattering rate γ ∗ (ω) and effective mass m ∗ (ω) of the Dr…
View article: Decoupling multiphase superconductivity from normal state ordering in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CeRh</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Decoupling multiphase superconductivity from normal state ordering in Open
${\mathrm{CeRh}}_{2}{\mathrm{As}}_{2}$ is a multiphase superconductor with ${T}_{\text{c}}=0.26$ K. The two superconducting (SC) phases, SC1 and SC2, observed for a magnetic field $H$ parallel to the $c$ axis of the tetragonal unit cell, h…
View article: Parity Transition of Spin-Singlet Superconductivity Using Sublattice Degrees of Freedom
Parity Transition of Spin-Singlet Superconductivity Using Sublattice Degrees of Freedom Open
Recently, a superconducting (SC) transition from low-field (LF) to high-field (HF) SC states was reported in CeRh_{2}As_{2}, indicating the existence of multiple SC states. It has been theoretically noted that the existence of two Ce sites…
View article: Interaction of in-plane Drude carrier with c-axis phonon in $\rm PdCoO_2$
Interaction of in-plane Drude carrier with c-axis phonon in $\rm PdCoO_2$ Open
We performed polarized reflection and transmission measurements on the layered conducting oxide $\rm PdCoO_2$ thin films. For the ab-plane, an optical peak near $Ω$ $\approx$ 750 cm$^{-1}$ drives the scattering rate $γ^{*}(ω)$ and effectiv…
View article: Crossing the ballistic-ohmic transition via high energy electron irradiation
Crossing the ballistic-ohmic transition via high energy electron irradiation Open
The delafossite metal PtCoO2 is among the highest-purity materials known, with low-temperature mean free path up to 5 mu m in the best as-grown single crystals. It exhibits a strongly faceted, nearly hexagonal Fermi surface. This property …
View article: Investigation of Planckian behavior in a high-conductivity oxide: PdCrO$_2$
Investigation of Planckian behavior in a high-conductivity oxide: PdCrO$_2$ Open
The layered delafossite metal PdCrO$_2$ is a natural heterostructure of highly conductive Pd layers Kondo coupled to localized spins in the adjacent Mott insulating CrO$_2$ layers. At high temperatures $T$ it has a $T$-linear resistivity w…
View article: Decoupling multi-phase superconductivity from normal state ordering in CeRh$_2$As$_2$
Decoupling multi-phase superconductivity from normal state ordering in CeRh$_2$As$_2$ Open
CeRh$_2$As$_2$ is a multi-phase superconductor with $T_{\textrm{c}}=0.26\,\textrm{K}$. The two superconducting (SC) phases, SC1 and SC2, observed for a magnetic field $H$ parallel to the $c$ axis of the tetragonal unit cell, have been inte…
View article: Visualization of defects in single-crystal and thin-film <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>PdCoO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> using aberration-corrected scanning transmission electron microscopy
Visualization of defects in single-crystal and thin-film using aberration-corrected scanning transmission electron microscopy Open
Single-crystal delafossite PdCoO2 is known to have an extremely low intrinsic impurity concentration of ~0.001%, demonstrating extraordinarily high conductivity with a mean free path of ~20 μm at low temperatures. However, when …
View article: Ubiquitous enhancement of nematic fluctuations across the phase diagram of iron based superconductors probed by the Nernst effect
Ubiquitous enhancement of nematic fluctuations across the phase diagram of iron based superconductors probed by the Nernst effect Open
View article: Conventional type-II superconductivity in locally noncentrosymmetric <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">LaRh</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> single crystals
Conventional type-II superconductivity in locally noncentrosymmetric single crystals Open
We report on the observation of superconductivity in LaRh$_2$As$_2$, which is the analogue without $f$-electrons of the heavy-fermion system with two superconducting phases CeRh$_2$As$_2$. A zero-resistivity transition, a specific-heat jum…