Vadim Grinenko
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View article: Hund's coupling assisted orbital-selective superconductivity in Ba1-xKxFe2As2
Hund's coupling assisted orbital-selective superconductivity in Ba1-xKxFe2As2 Open
While the superconducting transition temperature of hole-doped Ba_{1-x}K_{x}Fe_{2}As_{2} decreases past optimal doping, superconductivity does not completely disappear even for the fully doped KFe_{2}As_{2} compound. In fact, superconducti…
View article: Inhomogeneity-driven multiform Spontaneous Hall Effect in conventional and unconventional superconductors
Inhomogeneity-driven multiform Spontaneous Hall Effect in conventional and unconventional superconductors Open
The spontaneous Hall effect (SHE), a finite voltage occurring transversal to the electrical current in zero-magnetic field, has been observed in both conventional and unconventional superconductors, appearing as a peak near the superconduc…
View article: Contrasting c-axis and in-plane uniaxial stress effects on superconductivity and stripe order in La1.885Ba0.115CuO4
Contrasting c-axis and in-plane uniaxial stress effects on superconductivity and stripe order in La1.885Ba0.115CuO4 Open
The cuprate superconductor La2-x Ba x CuO4 (LBCO) near x = 0.125 is a striking example of intertwined electronic orders, where 3D superconductivity is anomalously suppressed, allowing s…
View article: Evidence of pseudogap and absence of spin magnetism in the time-reversal-symmetry-breaking state of Ba$_{1-x}$K$_x$Fe$_2$As$_2$
Evidence of pseudogap and absence of spin magnetism in the time-reversal-symmetry-breaking state of Ba$_{1-x}$K$_x$Fe$_2$As$_2$ Open
Muon-spin-rotation ($μ$SR) experiments and the observation of a spontaneous Nernst effect indicate time-reversal symmetry breaking (BTRS) at $T_{\rm c}^{\rm Z2}$ above the superconducting transition temperature $T_{\rm c}$ in Ba$_{1-x}$K$_…
View article: Evidence for saddle point-driven charge density wave on the surface of heavily hole-doped iron arsenide superconductors
Evidence for saddle point-driven charge density wave on the surface of heavily hole-doped iron arsenide superconductors Open
Unconventional superconductivity is known for its intertwining with other correlated states, making exploration of the intertwined orders important for understanding its pairing mechanism. In particular, spin and nematic orders are widely …
View article: Observation of single-quantum vortex splitting in the Ba$_{1-x}$K$_x$Fe$_2$As$_2$ superconductor
Observation of single-quantum vortex splitting in the Ba$_{1-x}$K$_x$Fe$_2$As$_2$ superconductor Open
Since their theoretical discovery more than a half-century ago, vortices observed in bulk superconductors have carried a quantized value of magnetic flux determined only by fundamental constants. A recent experiment reported 'unquantized' …
View article: Direct observation of quantum vortex fractionalization in multiband superconductors
Direct observation of quantum vortex fractionalization in multiband superconductors Open
Magnetic field is expelled from a superconductor, unless it forms quantum vortices, consisting of a core singularity with current circulating around it. The London quantization condition implies that there is one core singularity per quant…
View article: Ultrasound evidence for multicomponent superconducting order parameter in Ba$_{1-x}$K$_x$Fe$_2$As$_2$ with electron quadrupling phase
Ultrasound evidence for multicomponent superconducting order parameter in Ba$_{1-x}$K$_x$Fe$_2$As$_2$ with electron quadrupling phase Open
Experiments have pointed to the formation of the electron quadrupling condensate in Ba$_{1-x}$K$_x$Fe$_2$As$_2$ at $x \sim 0.8$. The state spontaneously breaks time-reversal symmetry and is sandwiched between two critical points, separatin…
View article: Magnetism in the Kitaev quantum spin liquid candidate <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>RuBr</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
Magnetism in the Kitaev quantum spin liquid candidate Open
The present studies show that long-range magnetic order takes place in RuBr3 at ≈34 K. The observations of clear oscillations in the muon time spectra demonstrate the presence of well-defined internal fields at the muon sites. T…
View article: Extraordinary Physical Properties of Superconducting Yba1.4sr0.6cu3o6se0.5 In a Multiphase Ceramic Material
Extraordinary Physical Properties of Superconducting Yba1.4sr0.6cu3o6se0.5 In a Multiphase Ceramic Material Open
View article: Designing the stripe-ordered cuprate phase diagram through uniaxial-stress
Designing the stripe-ordered cuprate phase diagram through uniaxial-stress Open
The ability to efficiently control charge and spin in the cuprate high-temperature superconductors is crucial for fundamental research and underpins technological development. Here, we explore the tunability of magnetism, superconductivity…
View article: In-Plane Magnetic Penetration Depth in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</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>RuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:mrow></mml:math>: Muon-Spin Rotation and Relaxation Study
In-Plane Magnetic Penetration Depth in : Muon-Spin Rotation and Relaxation Study Open
We report on measurements of the in-plane magnetic penetration depth (λ_{ab}) in single crystals of Sr_{2}RuO_{4} down to ≃0.015 K by means of muon-spin rotation-relaxation. The linear temperature dependence of λ_{ab}^{-2} for T≲0.7 K sugg…
View article: Magnetism in Kitaev Quantum Spin Liquid Candidate RuBr$_3$
Magnetism in Kitaev Quantum Spin Liquid Candidate RuBr$_3$ Open
The present studies show that long-range magnetic order takes place in RuBr$_3$ at $\approx$ 34 K. The observations of clear oscillations in the muon time spectra demonstrate the presence of well-defined internal fields at the muon sites. …
View article: Calorimetric evidence for two phase transitions in Ba1−xKxFe2As2 with fermion pairing and quadrupling states
Calorimetric evidence for two phase transitions in Ba1−xKxFe2As2 with fermion pairing and quadrupling states Open
View article: Extraordinary physical properties of superconducting YBa$_{1.4}$Sr$_{0.6}$Cu$_3$O$_6$Se$_{0.51}$ in a multiphase ceramic material
Extraordinary physical properties of superconducting YBa$_{1.4}$Sr$_{0.6}$Cu$_3$O$_6$Se$_{0.51}$ in a multiphase ceramic material Open
We report on a novel material obtained by modifying pristine YBCO superconductor in solid phase synthesis via simultaneous partial substitution of Ba by Sr and O by Se. Simultaneous application of EDX and EBSD confirmed that Se atoms indee…
View article: Superconducting vortices carrying a temperature-dependent fraction of the flux quantum
Superconducting vortices carrying a temperature-dependent fraction of the flux quantum Open
Magnetic field penetrates type-II bulk superconductors by forming quantum vortices that enclose a magnetic flux equal to the magnetic flux quantum. The flux quantum is a universal quantity that depends only on fundamental constants. In thi…
View article: In-plane magnetic penetration depth in Sr$_2$RuO$_4$: muon-spin rotation/relaxation study
In-plane magnetic penetration depth in Sr$_2$RuO$_4$: muon-spin rotation/relaxation study Open
We report on measurements of the in-plane magnetic penetration depth ($λ_{\rm ab}$) in single crystals of Sr$_2$RuO$_4$ down to $\simeq 0.015$ K by means of muon-spin rotation/relaxation. The linear temperature dependence of $λ^{-2}_{\rm a…
View article: Calorimetric evidence for two phase transitions in Ba1-xKxFe2As2 with fermion pairing and quadrupling states
Calorimetric evidence for two phase transitions in Ba1-xKxFe2As2 with fermion pairing and quadrupling states Open
Materials that break multiple symmetries allow, under certain conditions, the formation of four-fermion condensates above the superconducting critical temperature (Tc). Such states can be stabilized by phase fluctuations. Recent…
View article: Data for "Observation of superconducting vortices carrying a temperature-dependent fraction of the flux quantum"
Data for "Observation of superconducting vortices carrying a temperature-dependent fraction of the flux quantum" Open
Experimental data and numerical simulation code for the manuscript titled "Observation of superconducting vortices carrying a temperature-dependent fraction of the flux quantum" (preprint, DOI:10.48550/arXiv.2301.12368)
View article: Observation of superconducting vortices carrying a temperature-dependent fraction of the flux quantum
Observation of superconducting vortices carrying a temperature-dependent fraction of the flux quantum Open
The magnetic response is a state-defining property of superconductors. The magnetic flux penetrates type-II bulk superconductors by forming quantum vortices when the enclosed magnetic flux is equal to the magnetic flux quantum. The flux qu…
View article: <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> measurements on <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>RuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math> under <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>〈</mml:mo><mml:mn>110</mml:mn><mml:mo>〉</mml:mo></mml:mrow></mml:math> uniaxial stress
measurements on under uniaxial stress Open
Muon spin rotation/relaxation (μSR) and polar Kerr effect measurements provide evidence for a time-reversal symmetry breaking (TRSB) superconducting state in Sr2RuO4. However, the absence of a cusp in the superconducting transition tempera…
View article: $μ$SR measurements on Sr$_2$RuO$_4$ under $\langle 110 \rangle$ uniaxial stress
$μ$SR measurements on Sr$_2$RuO$_4$ under $\langle 110 \rangle$ uniaxial stress Open
Muon spin rotation/relaxation ($μ$SR) and polar Kerr effect measurements provide evidence for a time-reversal symmetry breaking (TRSB) superconducting state in Sr$_2$RuO$_4$. However, the absence of a cusp in the superconducting transition…
View article: Calorimetric evidence for two phase transitions in Ba$_{\rm 1-x}$K$_{\rm x}$Fe$_{2}$As$_{2}$ with fermion pairing and quadrupling states
Calorimetric evidence for two phase transitions in Ba$_{\rm 1-x}$K$_{\rm x}$Fe$_{2}$As$_{2}$ with fermion pairing and quadrupling states Open
Theoretically, materials that break multiple symmetries allow, under certain conditions, the formation of four-fermion condensates above the superconducting critical temperature. Such states can be stabilized by phase fluctuations. Recentl…
View article: Elastoresistivity of Heavily Hole-Doped 122 Iron Pnictide Superconductors
Elastoresistivity of Heavily Hole-Doped 122 Iron Pnictide Superconductors Open
Nematicity in heavily hole-doped iron pnictide superconductors remains controversial. Sizeable nematic fluctuations and even nematic orders far from magnetic instability were declared in RbFe 2 As 2 and its sister compounds. Here, we repor…
View article: Mechanistic Studies on the Hexadecafluorophthalocyanine–Iron‐Catalyzed Wacker‐Type Oxidation of Olefins to Ketones**
Mechanistic Studies on the Hexadecafluorophthalocyanine–Iron‐Catalyzed Wacker‐Type Oxidation of Olefins to Ketones** Open
The hexadecafluorophthalocyanine–iron complex FePcF 16 was recently shown to convert olefins into ketones in the presence of stoichiometric amounts of triethylsilane in ethanol at room temperature under an oxygen atmosphere. Herein, we des…
View article: Quartic metal: Spontaneous breaking of time-reversal symmetry due to four-fermion correlations in Ba$_{1-x}$K$_x$Fe$_2$As$_2$
Quartic metal: Spontaneous breaking of time-reversal symmetry due to four-fermion correlations in Ba$_{1-x}$K$_x$Fe$_2$As$_2$ Open
Discoveries of ordered quantum states of matter are of great fundamental interest, and often lead to unique applications. The most well known example -- superconductivity -- is caused by the formation and condensation of pairs of electrons…
View article: Nematic fluctuations in iron-oxychalcogenide Mott insulators
Nematic fluctuations in iron-oxychalcogenide Mott insulators Open
Nematic fluctuations occur in a wide range physical systems from biological molecules to cuprates and iron pnictide high- T c superconductors. It is unclear whether nematicity in pnictides arises from electronic spin or orbital degrees of …
View article: Unsplit superconducting and time reversal symmetry breaking transitions in Sr2RuO4 under hydrostatic pressure and disorder
Unsplit superconducting and time reversal symmetry breaking transitions in Sr2RuO4 under hydrostatic pressure and disorder Open
There is considerable evidence that the superconducting state of Sr2RuO4 breaks time reversal symmetry. In the experiments showing time reversal symmetry breaking, its onset temperature, TTRSB, is generally found to match the critical temp…
View article: Long-range magnetic order in the ${\tilde S}=1/2$ triangular lattice antiferromagnet KCeS$_2$
Long-range magnetic order in the ${\tilde S}=1/2$ triangular lattice antiferromagnet KCeS$_2$ Open
Recently, several putative quantum spin liquid (QSL) states were discovered in {\tilde S} = 1/2 rare-earth based triangular-lattice antiferromagnets (TLAF) with the delafossite structure. In order to elucidate the conditions for a…
View article: Using Uniaxial Stress to Probe the Relationship between Competing Superconducting States in a Cuprate with Spin-stripe Order
Using Uniaxial Stress to Probe the Relationship between Competing Superconducting States in a Cuprate with Spin-stripe Order Open
We report muon spin rotation and magnetic susceptibility experiments on in-plane stress effects on the static spin-stripe order and superconductivity in the cuprate system La_{2-x}Ba_{x}CuO_{4} with x=0.115. An extremely low uniaxial stres…