Benjamin A. Frandsen
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View article: High-temperature anomalous Hall effect driven by frustrated spin fluctuations in the antiferromagnetic delafossite metal PdCrO <sub>2</sub>
High-temperature anomalous Hall effect driven by frustrated spin fluctuations in the antiferromagnetic delafossite metal PdCrO <sub>2</sub> Open
Metallic delafossite oxides are of exceptional interest due to their ultraclean metallic transport. In the case of PdCrO 2 , this arises in a triangular-lattice antiferromagnet, creating a unique opportunity to study frustrated magnetism i…
View article: Cluster spin glass correlations and dynamics in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>Zn</mml:mi> <mml:mrow> <mml:mn>0.5</mml:mn> </mml:mrow> </mml:msub> <mml:msub> <mml:mi>Mn</mml:mi> <mml:mrow> <mml:mn>0.5</mml:mn> </mml:mrow> </mml:msub> <mml:mi>Te</mml:mi> </mml:mrow> </mml:math>
Cluster spin glass correlations and dynamics in Open
We present a magnetometry, muon spin relaxation ($μ$SR), and neutron scattering study of the insulating face-centered-cubic spin glass Zn$_{0.5}$Mn$_{0.5}$Te. The magnetometry and $μ$SR results confirm a spin freezing transition around $T_…
View article: Constraints on magnetism and correlations in RuO2 from lattice dynamics and Mössbauer spectroscopy
Constraints on magnetism and correlations in RuO2 from lattice dynamics and Mössbauer spectroscopy Open
We provide experimental evidence for the absence of a magnetic moment in bulk RuO$_2$, a candidate altermagnetic material, by using a combination of Mössbauer spectroscopy, nuclear forward scattering, inelastic X-ray and neutron scattering…
View article: Tuning the magnetic properties of the spin-split antiferromagnet MnTe through pressure
Tuning the magnetic properties of the spin-split antiferromagnet MnTe through pressure Open
The hexagonal antiferromagnet MnTe has attracted enormous interest as a prototypical example of a spin-compensated magnet in which the combination of crystal and spin symmetries lifts the spin degeneracy of the electron bands without the n…
View article: Constraints on magnetism and correlations in RuO$_2$ from lattice dynamics and Mössbauer spectroscopy
Constraints on magnetism and correlations in RuO$_2$ from lattice dynamics and Mössbauer spectroscopy Open
We provide experimental evidence for the absence of a magnetic moment in bulk RuO$_2$, a candidate altermagnetic material, by using a combination of Mössbauer spectroscopy, nuclear forward scattering, inelastic X-ray and neutron scattering…
View article: Constraints on magnetism and correlations in RuO2 from lattice dynamics and Mössbauer spectroscopy
Constraints on magnetism and correlations in RuO2 from lattice dynamics and Mössbauer spectroscopy Open
We provide experimental evidence for the absence of a magnetic moment in bulk RuO2, a candidate altermagnetic material, by using a combination of Mössbauer spectroscopy, nuclear forward scattering, inelastic X-ray and neutron scattering, a…
View article: Novel bipartite entanglement in the quantum dimer magnet Yb$_2$Be$_2$SiO$_7$
Novel bipartite entanglement in the quantum dimer magnet Yb$_2$Be$_2$SiO$_7$ Open
The quantum dimer magnet, with antiferromagnetic intradimer and interdimer Heisenberg exchange between spin-1/2 moments, is known to host an up/down - down/up singlet ground state when the intradimer exchange is dominant. Rare-earth-based …
View article: Magnetic Precursor to the Structural Phase Transition in V<sub>2</sub>O<sub>3</sub>
Magnetic Precursor to the Structural Phase Transition in V<sub>2</sub>O<sub>3</sub> Open
The coupling between structural, electronic and magnetic degrees of freedom across the metal‐insulator transition in V 2 O 3 makes it hard to determine the main driving mechanism behind the transition. Specifically, the role of magnetism i…
View article: When the Tail Wags the Dog, aka Short-range Correlations with Long-range Implications: A Magnetic PDF Story
When the Tail Wags the Dog, aka Short-range Correlations with Long-range Implications: A Magnetic PDF Story Open
The coupling of spin, charge, orbital, and lattice degrees of freedom is of fundamental importance to many functional and quantum materials. This coupling is typically discussed in terms of global symmetries and well-ordered crystallograph…
View article: UV-Vis spectral simulation of polysulfur species using the nuclear ensemble approximation
UV-Vis spectral simulation of polysulfur species using the nuclear ensemble approximation Open
The UV-Vis spectra for the polysulfur species S 2 –S 8 were investigated using the nuclear ensemble approximation approach. This work provides isomer specific absorption cross sections to be used in, for example, atmospheric models.
View article: Magnetic precursor to the structural phase transition in V$_2$O$_3$
Magnetic precursor to the structural phase transition in V$_2$O$_3$ Open
The coupling between structural, electronic and magnetic degrees of freedom across the metal-insulator transition in V2O3 makes it hard to determine the main driving mechanism behind the transition. Specifically, the role of magnetism has …
View article: Tuning the spin dynamics and magnetic phase transitions of the Cantor alloy via composition and sample processing protocols: A muon spin relaxation study
Tuning the spin dynamics and magnetic phase transitions of the Cantor alloy via composition and sample processing protocols: A muon spin relaxation study Open
CrMnFeCoNi, also called the Cantor alloy, is a well-known high-entropy alloy whose magnetic properties have recently become a focus of attention. Here, we present a detailed muon spin relaxation study of the influence of chemical compositi…
View article: A New Spin on Material Properties: Local Magnetic Structure in Functional and Quantum Materials
A New Spin on Material Properties: Local Magnetic Structure in Functional and Quantum Materials Open
The past few decades have made clear that the properties and performances of emerging functional and quantum materials can depend strongly on their local atomic and/or magnetic structure, particularly when details of the local structure de…
View article: Tuning the spin dynamics and magnetic phase transitions of the Cantor alloy via composition and sample processing protocols: A muon spin relaxation study
Tuning the spin dynamics and magnetic phase transitions of the Cantor alloy via composition and sample processing protocols: A muon spin relaxation study Open
CrMnFeCoNi, also called the Cantor alloy, is a well-known high-entropy alloy whose magnetic properties have recently become a focus of attention. We present a detailed muon spin relaxation study of the influence of chemical composition and…
View article: A New Spin on Material Properties: Local Magnetic Structure in Functional and Quantum Materials
A New Spin on Material Properties: Local Magnetic Structure in Functional and Quantum Materials Open
The past few decades have made clear that the properties and performances of emerging functional and quantum materials can depend strongly on their local atomic and/or magnetic structure, particularly when details of the local structure de…
View article: Magnon gap tuning in lithium-doped MnTe
Magnon gap tuning in lithium-doped MnTe Open
Manganese telluride (MnTe) is a prospective platform for ultrafast carrier dynamics, spin-based thermoelectrics, and magnon-drag transport due to its unique electronic and magnetic properties. We use inelastic neutron scattering to study b…
View article: Simulating UV-VIS Spectra for Polysulfur Species in the Venusian Atmosphere
Simulating UV-VIS Spectra for Polysulfur Species in the Venusian Atmosphere Open
The Venusian atmosphere has everything to be an exciting natural sulfur laboratory. In addition to relatively high concentrations of sulfur dioxide, suitable conditions in the atmosphere make both thermo- and photochemical reactions possib…
View article: Effect of solvothermal synthesis parameters on the crystallite size and atomic structure of cobalt iron oxide nanoparticles
Effect of solvothermal synthesis parameters on the crystallite size and atomic structure of cobalt iron oxide nanoparticles Open
This study shows that size–structure relationships in cobalt ferrite nanoparticles are highly influenced by the synthesis method.
View article: Local atomic and magnetic structure of multiferroic (Sr,Ba)(Mn,Ti)O$_3$
Local atomic and magnetic structure of multiferroic (Sr,Ba)(Mn,Ti)O$_3$ Open
We present a detailed study of the local atomic and magnetic structure of the type-I multiferroic perovskite system (Sr,Ba)(Mn,Ti)O$_3$ using x-ray and neutron pair distribution function (PDF) analysis, polarized neutron scattering, and mu…
View article: Tuning the magnetic properties of the CrMnFeCoNi Cantor alloy
Tuning the magnetic properties of the CrMnFeCoNi Cantor alloy Open
Magnetic properties of more than 20 Cantor alloy samples of varying composition were investigated over a temperature range of 5 K to 300 K and in fields of up to 70 kOe using magnetometry and muon spin relaxation. Two transitions are ident…
View article: Giant Spontaneous Magnetostriction in MnTe Driven by a Novel Magnetostructural Coupling Mechanism
Giant Spontaneous Magnetostriction in MnTe Driven by a Novel Magnetostructural Coupling Mechanism Open
A comprehensive x‐ray scattering study of spontaneous magnetostriction in hexagonal MnTe, an antiferromagnetic semiconductor with a Néel temperature of T N = 307 K, is presented. The largest spontaneous magnetovolume effect known for an an…
View article: Giant spontaneous magnetostriction in MnTe driven by a novel magnetostructural coupling mechanism
Giant spontaneous magnetostriction in MnTe driven by a novel magnetostructural coupling mechanism Open
We present a comprehensive x-ray scattering study of spontaneous magnetostriction in hexagonal MnTe, an antiferromagnetic semiconductor with a Neel temperature of $T_{\mathrm{N}} = 307$ K. We observe the largest spontaneous magnetovolume e…
View article: Symmetry-mode analysis for local structure investigations using pair distribution function data
Symmetry-mode analysis for local structure investigations using pair distribution function data Open
Symmetry-adapted distortion modes provide a natural way to describe distorted structures derived from higher-symmetry parent phases. Structural refinements using symmetry-mode amplitudes as fit variables have been used for at least 10 year…
View article: Coexistence of zigzag antiferromagnetic order and superconductivity in compressed NiPSe3
Coexistence of zigzag antiferromagnetic order and superconductivity in compressed NiPSe3 Open
NiPSe3 is regarded as a bandwidth-controlled Mott insulator, distinct from the widely studied Mott insulating magnetic graphene MPSe3 (M = Mn and Fe) family. By employing high-pressure synchrotron X-ray diffraction, we observe two structur…
View article: Magnetic pair distribution function data using polarized neutrons and <i>ad hoc</i> corrections
Magnetic pair distribution function data using polarized neutrons and <i>ad hoc</i> corrections Open
We report the first example of magnetic pair distribution function (mPDF) data obtained through the use of neutron polarization analysis. Using the antiferromagnetic semiconductor MnTe as a test case, we present high-quality mPDF data coll…
View article: <i>diffpy.mpdf</i>: open-source software for magnetic pair distribution function analysis
<i>diffpy.mpdf</i>: open-source software for magnetic pair distribution function analysis Open
The open-source Python package diffpy.mpdf , part of the DiffPy suite for diffraction and pair distribution function analysis, provides a user-friendly approach for performing magnetic pair distribution function (mPDF) analysis. The packag…
View article: Tuning the Magnetic Properties of the CrMnFeCoNi Cantor Alloy
Tuning the Magnetic Properties of the CrMnFeCoNi Cantor Alloy Open
Magnetic properties of more than twenty Cantor alloy samples of varying composition were investigated over a temperature range of 5 K to 300 K and in fields of up to 70 kOe using magnetometry and muon spin relaxation. Two transitions are i…
View article: Recent advances in magnetic PDF analysis: a case study with MnTe
Recent advances in magnetic PDF analysis: a case study with MnTe Open
Short-range magnetic correlations play an important role in numerous condensed matter systems of both fundamental and applied interest, ranging from quantum spin liquids to superconductors to technologically relevant magnetic alloys.When p…