R. Klingeler
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View article: Spin waves in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Na</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Co</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>TeO</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math> studied by high-frequency/high-field ESR: Successes and failures of the triple-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="normal">q</mml:mi></mml:math> model
Spin waves in studied by high-frequency/high-field ESR: Successes and failures of the triple- model Open
The Kitaev candidate material Na$_2$Co$_2$TeO$_6$ is proposed to be proximate to a quantum spin liquid state but a suitable spin model and the nature of its ground states are still under debate. Our high-frequency/high-field electron spin …
View article: Partially Manganese-Substituted Li-Rich Antiperovskite (Li<sub>2</sub>Fe)SeO Cathode for Li-Ion Batteries
Partially Manganese-Substituted Li-Rich Antiperovskite (Li<sub>2</sub>Fe)SeO Cathode for Li-Ion Batteries Open
Lithium-rich antiperovskites are promising high-capacity cathode materials for next-generation Li-ion batteries. In this study, partially Mn-substituted (Li2Fe1-y Mn y )-SeO (y = 0.1-0.…
View article: Anomalous Charge Density Wave and Fermi Surface Reconstruction in Pressurized BaFe2Al9
Anomalous Charge Density Wave and Fermi Surface Reconstruction in Pressurized BaFe2Al9 Open
The intermetallic compound BaFe2Al9 exhibits unusual physical properties associated with a charge density wave (CDW) transition. Unlike conventional CDW materials, which typically display subtle structural distortions or lattice modulation…
View article: Competing Interactions and the Effects of Uniaxial Out-of-plane Perturbations in the Honeycomb Antiferromagnet Na$_2$Co$_2$TeO$_6$
Competing Interactions and the Effects of Uniaxial Out-of-plane Perturbations in the Honeycomb Antiferromagnet Na$_2$Co$_2$TeO$_6$ Open
Despite exhibiting magnetic long-range order below $T_\mathrm{N} = 26.7\,\mathrm{K}$, the honeycomb cobaltate Na$_2$Co$_2$TeO$_6$ is predicted to enter a Kitaev spin liquid state when subjected to small external perturbations. While most o…
View article: Magnetic and thermodynamic studies on the distorted kagome magnet Pr$_3$BWO$_9$
Magnetic and thermodynamic studies on the distorted kagome magnet Pr$_3$BWO$_9$ Open
We report specific heat, ac/dc magnetic susceptibility as well as static and pulsed field magnetization studies on the distorted kagome magnet Pr$_3$BWO$_9$ down to 0.4~K and up to high magnetic fields. The low-temperature thermodynamic pr…
View article: Anisotropic magnetic phase diagrams, tricriticality, and spin reorientation in high-pressure grown <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>SmCrO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> single crystals
Anisotropic magnetic phase diagrams, tricriticality, and spin reorientation in high-pressure grown single crystals Open
SmCrO$_3$ single crystals were successfully grown utilizing the high-pressure optical floating-zone method and their crystal structure, magnetization behavior, and magnetic phase diagrams were thoroughly investigated. Magnetic studies were…
View article: The Relevance of Non‐Axiality and Low‐Lying Excited States for Slow Magnetic Relaxation in Pentagonal‐Bipyramidal Erbium(III) Complexes Probed by High‐frequency EPR
The Relevance of Non‐Axiality and Low‐Lying Excited States for Slow Magnetic Relaxation in Pentagonal‐Bipyramidal Erbium(III) Complexes Probed by High‐frequency EPR Open
High‐frequency/high‐field electron paramagnetic resonance studies on a series of seven‐coordinate pentagonal‐bipyramidal (PBP) erbium(III) complexes Er(DAPMBH/H 2 DAPS)X (H 2 DAPMBH = 2,6‐diacetylpyridine bis‐4‐methoxy benzoylhydrazone, H …
View article: The Interplay of Single Ion Anisotropy and Magnetic 3 <i>d</i>‐4 <i>f</i> Interactions in V<sup>III</sup><sub>2</sub>Ln<sup>III</sup><sub>2</sub> Butterfly Complexes
The Interplay of Single Ion Anisotropy and Magnetic 3 <i>d</i>‐4 <i>f</i> Interactions in V<sup>III</sup><sub>2</sub>Ln<sup>III</sup><sub>2</sub> Butterfly Complexes Open
Within the framework of 3 d –4 f molecular magnets, the most thoroughly investigated architecture is that of butterfly‐shaped coordination clusters as it provides an ideal testbed to study fundamental magnetic interactions. Here, we report…
View article: Two-stage evolution of magnetic correlations in the spiral spin liquid material <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>Ca</mml:mtext><mml:mn>10</mml:mn></mml:msub><mml:msub><mml:mtext>Cr</mml:mtext><mml:mn>7</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mn>28</mml:mn></mml:msub></mml:mrow></mml:math>
Two-stage evolution of magnetic correlations in the spiral spin liquid material Open
We present an X-band and tunable high-frequency/high-field electron spin resonance (HF-ESR) study of single-crystalline Ca$_{10}$Cr$_{7}$O$_{28}$, which constitutes alternating antiferromagnetic and ferromagnetic kagome bilayers. At high t…
View article: Uniaxial pressure effects, phase diagram, and tricritical point in the centrosymmetric skyrmion lattice magnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>GdRu</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>
Uniaxial pressure effects, phase diagram, and tricritical point in the centrosymmetric skyrmion lattice magnet Open
The magnetic phase diagram, magnetoelastic coupling, and uniaxial pressure effects of centrosymmetric magnetic skyrmion-hosting GdRu2Si2 are investigated by means of high-resolution capacitance dilatometry in fields up to 15 T supported b…
View article: Pressure-Tuned Magnetism and Bandgap Modulation in Layered Fe-Doped CrCl3
Pressure-Tuned Magnetism and Bandgap Modulation in Layered Fe-Doped CrCl3 Open
We explore the structural, magnetic, vibrational and optical band gap properties under varying pressures. By integrating first-principles calculations with experimental techniques, including Raman spectroscopy, photoluminescence (PL), unia…
View article: Signatures of a quantum critical endpoint in the Kitaev candidate <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Na</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Co</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>TeO</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>
Signatures of a quantum critical endpoint in the Kitaev candidate Open
The putative Kitaev material Na$_2$Co$_2$TeO$_6$ has recently been proposed to enter a quantum spin disordered state when magnetic fields are applied in parallel to the honeycomb layers. In this report we uncover signatures of a quantum cr…
View article: Separating cationic and anionic redox activity in antiperovskite Li$_2$Fe)SO
Separating cationic and anionic redox activity in antiperovskite Li$_2$Fe)SO Open
Lithium-rich antiperovskite promise to be a compelling high-capacity cathode material due to existence of both cationic and anionic redox activity. Little is however known about the effect of separating the electrochemical cationic from th…
View article: Slow Spin Relaxation and Low-Temperature Spin Freezing in Disordered Fluorite Ho$_2$Zr$_2$O$_7$
Slow Spin Relaxation and Low-Temperature Spin Freezing in Disordered Fluorite Ho$_2$Zr$_2$O$_7$ Open
We report on the origin of spin freezing in the disordered fluorite Ho$_2$Zr$_2$O$_7$. The system is investigated by low-temperature heat capacity as well as by DC and AC magnetization. While the system does not show a long-range magnetic …
View article: Magnetic properties and field-induced phenomena in the Jeff = 1/2 distorted kagome antiferromagnet
Magnetic properties and field-induced phenomena in the Jeff = 1/2 distorted kagome antiferromagnet Open
The intertwining between competing degrees of freedom, anisotropy, and frustration-induced quantum fluctuations offers an ideal ground to realize exotic quantum phenomena in the rare-earth-based kagome lattice. The magnetic susceptibility …
View article: Optical Probe of Magnetic Ordering Structure and Spin‐Entangled Excitons in Mn‐Substituted NiPS<sub>3</sub>
Optical Probe of Magnetic Ordering Structure and Spin‐Entangled Excitons in Mn‐Substituted NiPS<sub>3</sub> Open
In van der Waals magnets, the interplay between magneto‐excitonic coupling and optical phenomena opens avenues for directly probing magnetic ordering structures, manipulating excitonic properties through magnetic fields, and exploring quan…
View article: Motional Narrowing Effects in the Excited State Spin Populations of Mn-Doped Hybrid Perovskites
Motional Narrowing Effects in the Excited State Spin Populations of Mn-Doped Hybrid Perovskites Open
Spin-orbit coupling in the electronic states of solution-processed hybrid metal halide perovskites forms complex spin-textures in the band structures and allows for optical manipulation of the excited state spin-polarizations. Here, we rep…
View article: Redox-active, photoluminescent porous polymers based on spirofluorene-bridged <i>N</i>-heterotriangulenes and their feasibility as organic cathode materials
Redox-active, photoluminescent porous polymers based on spirofluorene-bridged <i>N</i>-heterotriangulenes and their feasibility as organic cathode materials Open
Redox-active microporous polymers were fabricated from functionalized spirofluorene-bridged N -heterotriangulenes. The polymers exhibited a capacity of 26 mA h g −1 with 80% capacity retention over 400 cycles when applied as cathode materi…
View article: Magnetic phase diagram and magnetoelastic coupling of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">NdB</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math> studied by high-resolution capacitance dilatometry up to 35 T
Magnetic phase diagram and magnetoelastic coupling of studied by high-resolution capacitance dilatometry up to 35 T Open
We report high-resolution dilatometry studies on single crystals of the Shastry-Sutherland-latticemagnet NdB4 supported by specific heat and magnetometry data. Our dilatometric studies evidence pronounced anomalies at the phase boundaries,…
View article: Magnetic phase diagram and magneto-elastic coupling of NdB$_4$ studied by high-resolution capacitance dilatometry up to 35~T
Magnetic phase diagram and magneto-elastic coupling of NdB$_4$ studied by high-resolution capacitance dilatometry up to 35~T Open
We report high-resolution dilatometry studies on single crystals of the Shastry-Sutherland-lattice magnet NdB$_4$ supported by specific heat and magnetometry data. Our dilatometric studies evidence pronounced anomalies at the phase boundar…
View article: High-pressure crystal growth and investigation of the metal-to-metal transition of Ruddlesden–Popper trilayer nickelates La4Ni3O10
High-pressure crystal growth and investigation of the metal-to-metal transition of Ruddlesden–Popper trilayer nickelates La4Ni3O10 Open
Single crystals of Ruddlesden-Popper nickelates La4Ni3O10 were grown by means of the floating-zone technique at oxygen pressure of 20 bar. Our results reveal the effects of the annealing process under pressure on the crystal structure. We …
View article: High-pressure crystal growth and investigation of the metal-to-metal transition of Ruddlesden-Popper trilayer nickelates La$_4$Ni$_3$O$_{10}$
High-pressure crystal growth and investigation of the metal-to-metal transition of Ruddlesden-Popper trilayer nickelates La$_4$Ni$_3$O$_{10}$ Open
Single crystals of Ruddlesden-Popper nickelates La$_4$Ni$_3$O$_{10}$ were grown by means of the floating-zone technique at oxygen pressure of 20~bar. Our results reveal the effects of the annealing process under pressure on the crystal str…
View article: 1/3 plateau and 3/5 discontinuity in the magnetization and the magnetic phase diagram of hexagonal GdInO$_3$
1/3 plateau and 3/5 discontinuity in the magnetization and the magnetic phase diagram of hexagonal GdInO$_3$ Open
We report the high-pressure optical floating-zone growth of GdInO$_3$ single crystals and show its magnetic phase diagram down to the mK-regime as determined by magnetization measurements. The centered-honeycomb lattice structure shows con…
View article: Synthetically encapsulated & self-organized transition metal oxide nano-structures inside carbon nanotubes as robust: Li-ion battery anode materials
Synthetically encapsulated & self-organized transition metal oxide nano-structures inside carbon nanotubes as robust: Li-ion battery anode materials Open
We report a comparative study on the electrochemical performance of four different transition metal oxides encapsulated inside carbon nanotubes (oxides@CNT), along with reference data obtained on a bare-oxide . A key result here is that th…
View article: Sonication-assisted liquid exfoliation and size-dependent properties of magnetic two-dimensional α-RuCl<sub>3</sub>
Sonication-assisted liquid exfoliation and size-dependent properties of magnetic two-dimensional α-RuCl<sub>3</sub> Open
Originating from the hexagonal arrangement of magnetic ions in the presence of strong spin orbit coupling, α -RuCl 3 is considered as model system for the Kitaev-Heisenberg model. While the magnetic properties of α -RuCl 3 have been studie…
View article: Magnetic circular dichroism in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>d</mml:mi><mml:mi>d</mml:mi></mml:mrow></mml:math> excitation in the van der Waals magnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">CrI</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> probed by resonant inelastic x-ray scattering
Magnetic circular dichroism in the excitation in the van der Waals magnet probed by resonant inelastic x-ray scattering Open
We report on a combined experimental and theoretical study on CrI3 single crystals by employing the polarization dependence of resonant inelastic x-ray scattering (RIXS). Our investigations reveal multiple Cr 3d orbital splitting (dd excit…
View article: Exfoliablity, magnetism, energy storage and stability of metal thiophosphate nanosheets made in liquid medium
Exfoliablity, magnetism, energy storage and stability of metal thiophosphate nanosheets made in liquid medium Open
The family of antiferromagnetic layered metal hexathiohypo diphosphates, M 2 P 2 S 6 represents a versatile class of materials, particularly interesting for fundamental studies on magnetic properties in low dimensional structures, and yet …
View article: Redox-active, porous pyrene tetraone dendritic polymers as cathode materials for lithium-ion batteries
Redox-active, porous pyrene tetraone dendritic polymers as cathode materials for lithium-ion batteries Open
Redox active, insoluble pyrene tetraone based dendritic porous polymers were synthesized by using different catalyst loadings and work-up procedures.
View article: Magnetic properties of the triangular-lattice antiferromagnets <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Ba</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>R</mml:mi><mml:mi mathvariant="normal">B</mml:mi></mml:mrow><mml:mn>9</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>18</mml:mn></mml:msub></mml:mrow></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>(</mml:mo><mml:mi>R</mml:mi><mml:mo>=</mml:mo><mml:mi>Yb</mml:mi><mml:mo>,</mml:mo><mml:mo> </mml:mo><mml:mi>Er</mml:mi><mml:mo>)</mml:mo></mml:math>
Magnetic properties of the triangular-lattice antiferromagnets Open
Frustration, spin correlations and interplay between competing degrees of freedom are some of the key ingredients that underlie exotic states with fractional excitations in quantum materials. Rare-earth based two dimensional magnetic latti…
View article: Fabrication of 3D graphene/MoS2 spherical heterostructure as anode material in Li-ion battery
Fabrication of 3D graphene/MoS2 spherical heterostructure as anode material in Li-ion battery Open
Three-dimensional (3D) graphene-based nanocomposites have received considerable attention in both fundamental research and industrial applications, as they combine the functionalities of well-controlled nano-architectures and the integrity…