J. Strempfer
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View article: Resonant diffraction and photoemission inconsistent with altermagnetism in epitaxial RuO$_2$ films
Resonant diffraction and photoemission inconsistent with altermagnetism in epitaxial RuO$_2$ films Open
Excitement about the magnetic and electronic properties of RuO$_2$ is growing, fueled by reports of antiferromagnetism, strain-induced superconductivity, and its recent classification as a member of a newly proposed magnetic class, alterma…
View article: Frustrated charge density wave and quasi-long-range bond-orientational order in the magnetic kagome FeGe
Frustrated charge density wave and quasi-long-range bond-orientational order in the magnetic kagome FeGe Open
The intrinsic frustrated nature of a kagome lattice is amenable to the realization of exotic phases of matter, such as quantum spin liquids or spin ices, and the multiple- q charge density waves (CDW) in the kagome metals. Despite intense …
View article: Deconvolution of X-ray natural and magnetic circular dichroism in chiral Dy-ferroborate
Deconvolution of X-ray natural and magnetic circular dichroism in chiral Dy-ferroborate Open
Structural chirality and magnetism, when intertwined, can have profound implications on materials properties. Using X-ray imaging and spectroscopic measurements that leverage the natural and magnetic circular dichroic effects present in ma…
View article: Frustrated charge density wave and quasi-long-range bond-orientational order in the magnetic kagome FeGe
Frustrated charge density wave and quasi-long-range bond-orientational order in the magnetic kagome FeGe Open
The intrinsic frustrated nature of a kagome lattice is amenable to the realization of exotic phases of matter, such as quantum spin liquids or spin ices, and more recently the multiple-$\mathrm{\textbf{q}}$ charge density waves (CDW) in th…
View article: Intertwined charge and spin density waves in a topological kagome material
Intertwined charge and spin density waves in a topological kagome material Open
Using neutrons and x rays we show the topological kagome antiferromagnet Mn3Sn for T<285K forms a homogeneous spin and charge ordered state comprising a longitudinally polarized spin density wave with wave vector kβ=kβĉ, a helical modulate…
View article: 3D imaging of magnetic domains in Nd<sub>2</sub>Fe<sub>14</sub>B using scanning hard X-ray nanotomography
3D imaging of magnetic domains in Nd<sub>2</sub>Fe<sub>14</sub>B using scanning hard X-ray nanotomography Open
Nanoscale structural and electronic heterogeneities are prevalent in condensed matter physics. Investigating these heterogeneities in 3D has become an important task for understanding material properties. To provide a tool to unravel the c…
View article: Electronic structure and lattice dynamics of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>1</mml:mn><mml:mi>T</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>VSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>: Origin of the three-dimensional charge density wave
Electronic structure and lattice dynamics of : Origin of the three-dimensional charge density wave Open
To characterize in detail the charge density wave (CDW) transition of 1T-VSe2, its electronic structure and lattice dynamics are comprehensively studied by means of x-ray diffraction, muon spectroscopy, angle resolved photoemission (ARPES)…
View article: Quantum spin nematic phase in a square-lattice iridate
Quantum spin nematic phase in a square-lattice iridate Open
View article: Bootstrapped Dimensional Crossover of a Spin Density Wave
Bootstrapped Dimensional Crossover of a Spin Density Wave Open
Quantum materials display rich and myriad types of magnetic, electronic, and structural ordering, often with these ordering modes either competing with one another or “intertwining,” that is, reinforcing one another. Low-dimensional quantu…
View article: Softening of a flat phonon mode in the kagome ScV6Sn6
Softening of a flat phonon mode in the kagome ScV6Sn6 Open
View article: Quantum spin nematic phase in a square-lattice iridate
Quantum spin nematic phase in a square-lattice iridate Open
Spin nematic (SN) is a magnetic analog of classical liquid crystals, a fourth state of matter exhibiting characteristics of both liquid and solid. Particularly intriguing is a valence-bond SN, in which spins are quantum entangled to form a…
View article: Electronic structure and lattice dynamics of 1T-VSe$_2$: origin of the 3D-CDW
Electronic structure and lattice dynamics of 1T-VSe$_2$: origin of the 3D-CDW Open
In order to characterize in detail the charge density wave (CDW) transition of 1$T$-VSe$_2$, its electronic structure and lattice dynamics are comprehensively studied by means of x-ray diffraction, angle resolved photoemission (ARPES), dif…
View article: Structural and magnetic interplay in multiferroic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>Ho</mml:mtext><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mtext>Nd</mml:mtext><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mtext>Fe</mml:mtext><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mtext>BO</mml:mtext><mml:mn>3</mml:mn></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
Structural and magnetic interplay in multiferroic Open
Rare-earth iron borates, RFe3(BO3)4 (R = rare earth), are of considerable interest because of their structural and magnetic complexities due to the involvement of both 3d and 4f magnetic interactions in a helical lattice. Among them Ho0.5N…
View article: Possibilities at the Polar beamline with APS-U
Possibilities at the Polar beamline with APS-U Open
The Polar beamline will make use of the small emittance of the new APS-U storage ring and will offer extremely brilliant and coherent beam of variable polarization in the hard x-ray range. Tailored optics and experimental equipment will en…
View article: Strain-induced orbital-energy shift in antiferromagnetic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>RuO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> revealed by resonant elastic x-ray scattering
Strain-induced orbital-energy shift in antiferromagnetic revealed by resonant elastic x-ray scattering Open
In its ground state, RuO2 was long thought to be an ordinary metallic paramagnet. Recent neutron and x-ray diffraction revealed that bulk RuO2 is an antiferromagnet with TN above 300 K. Furthermore, epitaxi…
View article: Reconciling Monolayer and Bilayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>J</mml:mi></mml:mrow><mml:mrow><mml:mi>eff</mml:mi></mml:mrow></mml:msub><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math> Square Lattices in Hybrid Oxide Superlattice
Reconciling Monolayer and Bilayer Square Lattices in Hybrid Oxide Superlattice Open
The number of atomic layers confined in a two-dimensional structure is crucial for the electronic and magnetic properties. Single-layer and bilayer J_{eff}=1/2 square lattices are well-known examples where the presence of the extra layer t…
View article: Bootstrapped Dimensional Crossover of a Spin Density Wave
Bootstrapped Dimensional Crossover of a Spin Density Wave Open
Quantum materials display rich and myriad types of magnetic, electronic, and structural ordering, often with these ordering modes either competing with one another or 'intertwining', that is, reinforcing one another. Low dimensional quantu…
View article: Observation of orbital order in the van der Waals material <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>1</mml:mn><mml:mi>T</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>TiSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Observation of orbital order in the van der Waals material Open
Besides magnetic and charge order, regular arrangements of orbital occupation constitute a fundamental order parameter of condensed matter physics. Even though orbital order is difficult to identify directly in experiments, its presence wa…
View article: Low-temperature nanoscale heat transport in a gadolinium iron garnet heterostructure probed by ultrafast x-ray diffraction
Low-temperature nanoscale heat transport in a gadolinium iron garnet heterostructure probed by ultrafast x-ray diffraction Open
Time-resolved x-ray diffraction has been used to measure the low-temperature thermal transport properties of a Pt/Gd3Fe5O12//Gd3Ga5O12 metal/oxide heterostructure relevant to applications in spin caloritronics. A pulsed femtosecond optical…
View article: Monoclinic symmetry at the nanoscale in lead-free ferroelectric <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>BaZr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Ti</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> ceramics
Monoclinic symmetry at the nanoscale in lead-free ferroelectric ceramics Open
Local structural symmetries play a key role in the functionalities of\nferroelectric materials and are often found different from average symmetry.\nHere, we study the real space nanoscale structure in Pb-free\nBaZr$_{x}$Ti$_{1-x}$O$_{3}$ …
View article: Ferroelectric incommensurate spin crystals
Ferroelectric incommensurate spin crystals Open
View article: Strain-induced orbital energy shift in antiferromagnetic RuO2 revealed by resonant elastic x-ray scattering
Strain-induced orbital energy shift in antiferromagnetic RuO2 revealed by resonant elastic x-ray scattering Open
In its ground state, RuO2 was long thought to be an ordinary metallic paramagnet. Recent neutron and x-ray diffraction revealed that bulk RuO2 is an antiferromagnet (AFM) with TN above 300 K. Furthermore, epitaxial strain induces novel sup…
View article: Large intrinsic anomalous Hall effect in SrIrO3 induced by magnetic proximity effect
Large intrinsic anomalous Hall effect in SrIrO3 induced by magnetic proximity effect Open
View article: Possible quantum fluctuations in the vicinity of the quantum critical point of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>Sr</mml:mi><mml:mo>,</mml:mo><mml:mi>Ca</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Ir</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>Sn</mml:mi><mml:mn>13</mml:mn></mml:msub></mml:mrow></mml:math> revealed by high-energy x-ray diffraction
Possible quantum fluctuations in the vicinity of the quantum critical point of revealed by high-energy x-ray diffraction Open
We explore the evolution of the structural phase transition of $\rm{(Sr, Ca)_3Ir_4Sn_{13}}$, a model system to study the interplay between structural quantum criticality and superconductivity, by means of high-energy x-ray diffraction meas…
View article: Natural ferroelectric order near ambient temperature in the orthoferrite <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>HoFeO</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math>
Natural ferroelectric order near ambient temperature in the orthoferrite Open
Current scenario in multiferroics demands a breakthrough discovery of\npromising materials after BiFeO3. Recently, the controversial discovery of room\ntemperature ferroelectricity (FE) in SmFeO3 [PRL 107, 117201 (2011); 113,\n217203 (2014…
View article: Fluctuations in the vicinity of the quantum critical point of $\mathbf{(Sr, Ca)_3Ir_4Sn_{13}}$ revealed by high-energy X-ray diffraction study
Fluctuations in the vicinity of the quantum critical point of $\mathbf{(Sr, Ca)_3Ir_4Sn_{13}}$ revealed by high-energy X-ray diffraction study Open
We explore the evolution of the structural phase transition of $\rm{(Sr, Ca)_3Ir_4Sn_{13}}$, a model system to study the interplay between structural quantum criticality and superconductivity, by means of high-energy x-ray diffraction meas…
View article: Intrinsic Ferroelectricity in Charge-Ordered Magnetite
Intrinsic Ferroelectricity in Charge-Ordered Magnetite Open
Single crystalline magnetite Fe3O4 was investigated at low temperatures in the charge ordered state by electric measurements and time-resolved diffraction with voltage applied in-situ. Dielectric spectroscopy indicates relaxor ferroelectri…
View article: Suppression of the outwards-dispersing branches in hour-glass magnetic spectra induced by nanoscale phase separation in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>CoO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
Suppression of the outwards-dispersing branches in hour-glass magnetic spectra induced by nanoscale phase separation in Open
Here, we reinvestigate the underlying charge and magnetic correlations in La2−xSrxCoO4 within a combined study of muon spin relaxation (μSR), x-ray photon correlation spectroscopy…
View article: Anomalous Antiferromagnetism in Metallic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>RuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> Determined by Resonant X-ray Scattering
Anomalous Antiferromagnetism in Metallic Determined by Resonant X-ray Scattering Open
We studied the magnetic ordering of thin films and bulk crystals of rutile RuO_{2} using resonant x-ray scattering across the Ru L_{2} absorption edge. Combining polarization analysis and azimuthal angle dependence of the magnetic Bragg si…
View article: Pressure-induced rotational symmetry breaking in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>URu</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>
Pressure-induced rotational symmetry breaking in Open
Phase transitions and symmetry are intimately linked. Melting of ice, for\nexample, restores translation invariance. The mysterious hidden order (HO)\nphase of URu$_2$Si$_2$ has, despite relentless research efforts, kept its\nsymmetry brea…