C. Krellner
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View article: Growth-Controlled Twinning and Magnetic Anisotropy in CeSb$_2$
Growth-Controlled Twinning and Magnetic Anisotropy in CeSb$_2$ Open
Cerium diantimonide (CeSb$_2$) is a layered heavy-fermion Kondo lattice material that hosts complex magnetism and pressure-induced superconductivity. The interpretation of its in-plane anisotropy has remained unsettled due to structural tw…
View article: Magnetic phase diagram of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>YbRh</mml:mi> <mml:mn>2</mml:mn> </mml:msub> <mml:msub> <mml:mi>Si</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> : The influence of hyperfine interactions
Magnetic phase diagram of : The influence of hyperfine interactions Open
We report the determination of the magnetic phase diagram of the heavy fermion metal YbRh 2 Si 2 in magnetic fields up to 70 mT applied perpendicular to the crystallographic c axis. By a combination of heat capacity, magnetocalor…
View article: Strongly Entangled Kondo and Kagome Lattices and the Emergent Magnetic Ground State in Heavy-Fermion Kagome Metal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>YbV</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sn</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:mrow></mml:math>
Strongly Entangled Kondo and Kagome Lattices and the Emergent Magnetic Ground State in Heavy-Fermion Kagome Metal Open
Applying angle-resolved photoemission spectroscopy and density functional theory calculations, we present compelling spectroscopic evidence demonstrating the intertwining and mutual interaction between the Kondo and kagome sublattices in h…
View article: Towards a critical endpoint in the valence fluctuating Eu(Rh <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si134.svg" display="inline" id="d1e798"> <mml:msub> <mml:mrow/> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>−</mml:mo> <mml:mi>x</mml:mi> </mml:mrow> </mml:msub> </mml:math> Co <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si135.svg" display="inline" id="d1e810"> <mml:msub> <mml:mrow/> <mml:mrow> <mml:mi>x</mml:mi> </mml:mrow> </mml:msub> </mml:math> )2Si2 system
Towards a critical endpoint in the valence fluctuating Eu(Rh Co )2Si2 system Open
View article: Electron Spin Resonance of Eu on triangular layers in EuT2P2 (T =Mn, Zn, Cd)
Electron Spin Resonance of Eu on triangular layers in EuT2P2 (T =Mn, Zn, Cd) Open
We report on the electron spin resonance (ESR) of Eu$^{2+}$ in Eu$T_{2}$P$_{2}$ ($T$=Mn, Zn, Cd) single crystals. The temperature dependencies of ESR linewidth and resonance shift show a similar behaviour when approaching the Eu-ordered st…
View article: Towards a critical endpoint in the valence fluctuating Eu(Rh$_{1-x}$Co$_{x}$)$_2$Si$_2$ system
Towards a critical endpoint in the valence fluctuating Eu(Rh$_{1-x}$Co$_{x}$)$_2$Si$_2$ system Open
We report on the successful single crystal growth of pure EuRh${_2}$Si${_2}$ and of Eu(Rh$_{1-x}$Co$_{x}$)$_2$Si$_2$ with $x\leq0.23$ by the flux method. Through Co substitution, EuRh$_2$Si$_2$ can be tuned from stable antiferromagnetism v…
View article: Robust Magnetic Polaron Percolation in the Antiferromagnetic CMR System EuCd$_2$P$_2$
Robust Magnetic Polaron Percolation in the Antiferromagnetic CMR System EuCd$_2$P$_2$ Open
Antiferromagnetic EuCd$_2$P$_2$ has attracted considerable attention due to its unconventional (magneto)transport properties. At a temperature $T_{\rm peak}$ significantly above the magnetic ordering temperature $T_\textrm{N} = 11\,$K a la…
View article: Electronic Structure Dimensionality of the Quantum-Critical Ferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>YbNi</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">P</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Electronic Structure Dimensionality of the Quantum-Critical Ferromagnet Open
YbNi_{4}P_{2} is the first known ferromagnetic metal showing a second-order quantum phase transition. Current theoretical understanding rules out second-order ferromagnetic quantum criticality in centrosymmetric two- and three-dimensional …
View article: Spin liquid state in Y-Kapellasite, Y$_3$Cu$_9$(OH)$_{19}$Cl$_8$ by external pressure controlled frustration
Spin liquid state in Y-Kapellasite, Y$_3$Cu$_9$(OH)$_{19}$Cl$_8$ by external pressure controlled frustration Open
Magnetic frustration is a key ingredient to prevent conventional ordering and, in combination with enhanced fluctuations in low dimensional quantum magnets, to stabilize the long sought spin liquid ground states. Most experimental spin liq…
View article: Odd-parity superconductivity underpinned by antiferromagnetism in heavy fermion metal YbRh$_2$Si$_2$
Odd-parity superconductivity underpinned by antiferromagnetism in heavy fermion metal YbRh$_2$Si$_2$ Open
Topological superconductors are essential elements of the periodic table of topological quantum matter. However, the relevant odd-parity spin-triplet superconductors are rare. We report high-resolution measurements of the complex electrica…
View article: Magnetic Phase Diagram of YbRh\textsubscript{2}Si\textsubscript{2}: the Influence of Hyperfine Interactions
Magnetic Phase Diagram of YbRh\textsubscript{2}Si\textsubscript{2}: the Influence of Hyperfine Interactions Open
We report the determination of the magnetic phase diagram of the heavy fermion metal YbRh\textsubscript{2}Si\textsubscript{2} in magnetic fields up to 70\,mT applied perpendicular to the crystallographic c-axis. By a combination of heat ca…
View article: Single crystal growth and physical characterization to fine tune YbIn1-xTxCu4 (T = Au, Ag) towards the critical endpoint of the valence transition
Single crystal growth and physical characterization to fine tune YbIn1-xTxCu4 (T = Au, Ag) towards the critical endpoint of the valence transition Open
Pure as well as Ag- and Au-substituted YbInCu$_4$ single crystals were structurally and chemically characterized and investigated by means of heat capacity, magnetization, resistivity and ultrasonic measurements. We studied the influence o…
View article: Magnetic frustration and weak Mn magnetic ordering in EuMn$_2$P$_2$
Magnetic frustration and weak Mn magnetic ordering in EuMn$_2$P$_2$ Open
We report on the electron spin resonance (ESR), heat capacity, magnetization, nuclear magnetic resonance (NMR), magnetic circular and linear dichroism (XMCD, XMLD), as well as the electrical resistivity of EuMn$_{2}$P$_{2}$ single crystals…
View article: Towards a Critical Endpoint in the Valence Fluctuating Eu(Rh1− X Co X )2si2system
Towards a Critical Endpoint in the Valence Fluctuating Eu(Rh1− X Co X )2si2system Open
View article: Towards a Critical Endpoint in the Valence Fluctuating Eu(Rh1− X Co X )2si2system
Towards a Critical Endpoint in the Valence Fluctuating Eu(Rh1− X Co X )2si2system Open
View article: Discovery of a non-Hermitian phase transition in a bulk condensed-matter system
Discovery of a non-Hermitian phase transition in a bulk condensed-matter system Open
Phase transitions are fundamental in nature. A small parameter change near a critical point leads to a qualitative change in system properties. Across a regular phase transition, the system remains in thermal equilibrium and, therefore, ex…
View article: Discovery of a non-Hermitian phase transition in a bulk condensed-matter system
Discovery of a non-Hermitian phase transition in a bulk condensed-matter system Open
Phase transitions are fundamental in nature. A small parameter change near a critical point leads to a qualitative change in system properties. Across a regular phase transition, the system remains in thermal equilibrium and, therefore, ex…
View article: Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo<sub>2</sub>P<sub>2</sub>
Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo<sub>2</sub>P<sub>2</sub> Open
Studying and understanding many‐body interactions, particularly electron‐boson interactions, is essential for a deeper elucidation of fundamental physical phenomena and the development of novel material functionalities. Here, this aspect i…
View article: The electronic structure of EuPd$_2$Si$_2$ in the vicinity of the critical endpoint
The electronic structure of EuPd$_2$Si$_2$ in the vicinity of the critical endpoint Open
Hard X-ray angle-resolved photoemission spectroscopy reveals significant alterations in the valence band states of EuPd$_2$Si$_2$ at a temperature $T_V$, where the Eu ions undergo a temperature-induced valence crossover from a magnetic Eu$…
View article: Controlling <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>4</mml:mn><mml:mi>f</mml:mi></mml:math> antiferromagnetic dynamics via itinerant electronic susceptibility
Controlling antiferromagnetic dynamics via itinerant electronic susceptibility Open
Optical manipulation of magnetism holds promise for future ultrafast spintronics, especially with lanthanides and their huge, localized 4f magnetic moments. These moments interact indirectly by spin polarizing the conduction electrons (the…
View article: Physical properties of the ferromagnetic quantum critical system YbNi$_4$(P$_{1-x}$As$_{x}$)$_2$
Physical properties of the ferromagnetic quantum critical system YbNi$_4$(P$_{1-x}$As$_{x}$)$_2$ Open
We report on single crystal growth and physical properties of the quantum critical Kondo-lattice system YbNi$_4$(P$_{1-x}$As$_{x}$)$_2$ with $0\leq x\leq 1$ which hosts a ferromagnetic quantum critical point at $x \approx 0.1$. We performe…
View article: Controlling 4f antiferromagnetic dynamics via itinerant electronic susceptibility
Controlling 4f antiferromagnetic dynamics via itinerant electronic susceptibility Open
Optical manipulation of magnetism holds promise for future ultrafast spintronics, especially with lanthanides and their huge, localized 4f magnetic moments. These moments interact indirectly via the conduction electrons (RKKY exchange), in…
View article: Coupling between magnetic and thermodynamic properties in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>R</mml:mi><mml:msub><mml:mi>Rh</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Si</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow><mml:mspace width="4pt"/><mml:mrow><mml:mo>(</mml:mo><mml:mi>R</mml:mi></mml:mrow></mml:math> = Dy, Ho)
Coupling between magnetic and thermodynamic properties in = Dy, Ho) Open
Single crystals of DyRh2Si2 and HoRh2Si2 were investigated by thermal expansion and magnetostriction. The different types of magnetic order can clearly be seen in these measurements, particularly the canting of the moments away from the cr…
View article: Magnetism, heat capacity and electronic structure of EuCd$_2$P$_2$ in view of its colossal magnetoresistance
Magnetism, heat capacity and electronic structure of EuCd$_2$P$_2$ in view of its colossal magnetoresistance Open
The mechanism of the peculiar transport properties around the magnetic ordering temperature of semiconducting antiferromagnetic EuCd$_2$P$_2$ is not yet understood. With a huge peak in the resistivity observed above the Néel temperature, $…
View article: Valence transition induced changes of the electronic structure in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>EuPd</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Si</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Valence transition induced changes of the electronic structure in Open
We present the results of hard x-ray angle-resolved photoemission spectroscopy and photoemission diffraction measurements performed on high-quality single crystals of the valence transition compound ${\mathrm{EuPd}}_{2}{\mathrm{Si}}_{2}$ f…
View article: Coupling between magnetic and thermodynamic properties in $R$Rh$_2$Si$_2$ ($R$ = Dy, Ho)
Coupling between magnetic and thermodynamic properties in $R$Rh$_2$Si$_2$ ($R$ = Dy, Ho) Open
Single crystals of DyRh$_2$Si$_2$ and HoRh$_2$Si$_2$ were investigated by thermal expansion and magnetostriction. The different types of magnetic order can clearly be seen in these measurements, particularly the canting of the moments away…
View article: Planar parallel phonon Hall effect and local symmetry breaking
Planar parallel phonon Hall effect and local symmetry breaking Open
Y-kapellasite [Y3Cu9(OH)19Cl8] is a frustrated antiferromagnetic insulator which remains paramagnetic down to a remarkably low Néel temperature of about 2 K. Having studied this material in the paramagnetic regime, in which phonons are the…
View article: Valence-transition-induced changes of the electronic structure in EuPd$_2$Si$_2$
Valence-transition-induced changes of the electronic structure in EuPd$_2$Si$_2$ Open
We present results of hard X-ray angle-resolved photoemission spectroscopy and photoemission diffraction measurements performed on high-quality single crystals of the valence transition compound EuPd$_2$Si$_2$ for temperatures 25~K $\leq$ …
View article: Long-lived spin waves in a metallic antiferromagnet
Long-lived spin waves in a metallic antiferromagnet Open
View article: Critical slowing down near a magnetic quantum phase transition with fermionic breakdown
Critical slowing down near a magnetic quantum phase transition with fermionic breakdown Open