Publications
Showing 184 results for Author: Andrew D. Christianson
Jun, 2026
Journal
Anisotropic magnetism and Kondo-lattice behavior in the frustrated antiferromagnet Ce3MgBi5
We report the synthesis and physical characterization of single-crystalline Ce3MgBi5, a previously unexplored member of the Ce3𝑀𝑃𝑛5 family. This compound crystallizes in the hexagonal 𝑃63/𝑚𝑐𝑚 structure, featuring an anisotropic Ce sublattice composed of zigzag chains along the 𝑐 axis and a distorted kagome-like network in the basal plane. Magnetization measurements…
May, 2026
Journal
Magnetism of single crystalline breathing pyrochlore spinel AgInCr4S8
Single crystals of AgInCr4S8 are grown by chemical vapor transport and crystallographic ordering of Ag/In that results in a breathing pyrochlore motif of Cr3+ is verified by x-ray and neutron diffraction. Long-range antiferromagnetic order is observed below a Néel temperature of 𝑇N ≈ 9.6 K. The magnetic properties are characterized using ac and dc magnetization, specifi…
Apr, 2026
Journal
Codimension-two spiral spin liquid in the effective honeycomb-lattice compound Cs3Fe2Cl9
A codimension-two spiral spin liquid is a correlated paramagnetic state with one-dimensional ground state degeneracy hosted within a three-dimensional lattice. Here, via neutron scattering experiments and numerical simulations, we establish the existence of a codimension-two spiral spin liquid in the effective honeycomb-lattice compound Cs3Fe2Cl9, which demonstrates an a…
Feb, 2026
Journal
Magnetic field dependence of the spin fluctuations in CeCu5.8Ag0.2
Quantum phase transitions are among the most intriguing phenomena that can occur when the electronic ground state of correlated metals are tuned by external parameters such as pressure, magnetic field, or chemical substitution. Such transitions between distinct states of matter are driven by quantum fluctuations, and can give rise to macroscopically coherent phases that ar…
Sep, 2025
Journal
Electronic, magnetic, and thermodynamic properties of the kagome layer compound FeSn
Single crystals of the single kagome layer compound FeSn are investigated using x-ray and neutron scattering, magnetic susceptibility and magnetization, heat capacity, resistivity, Hall, Seebeck, thermal expansion, thermal conductivity measurements, and density functional theory (DFT). FeSn is a planar antiferromagnet below 𝑇N=365K and exhibits ferromagnetic magnetic order…
Aug, 2025
Journal
Dipolar and quadrupolar correlations in the 5𝑑2 Re-based double perovskites Ba2YReO6 and Ba2ScReO6
Double perovskites containing heavy transition-metal ions are an important family of compounds for the study of the interplay between electron correlation and spin-orbit coupling. Here, by combining magnetic susceptibility, heat capacity, and neutron scattering measurements, we investigate the dipolar and quadrupolar correlations in two prototypal rhenium-based double pero…
Aug, 2025
Journal
Gapped commensurate antiferromagnetic response in a strongly underdoped model cuprate superconductor
It is a distinct possibility that spin fluctuations are the pairing interactions in numerous unconventional superconductors. In the high-transition-temperature (high-Tc) cuprates, superconductivity emerges upon doping antiferromagnetic Mott insulators, and spin fluctuations might furthermore drive unusual pseudogap phenomena. Here we use magnetic neutron scattering to stud…
Jul, 2025
Journal
Anisotropic magnetic behavior of Nd3ScBi5 and Pr3ScBi5 single crystals
We report an investigation of the magnetic, thermodynamic, and transport properties of single-crystalline Nd3ScBi5 and Pr3ScBi5. Both compounds crystallize in the hexagonal 𝑃63/𝑚𝑐𝑚 space group that is common to related materials with rare-earth atoms that form twisted kagome nets. Nd3ScBi5 undergoes two successive antiferromagnetic transitions, at 𝑇𝑁=5.6K and 𝑇2=4.7K…
May, 2025
Journal
Spin density wave and van Hove singularity in the kagome metal CeTi3Bi4
Kagome metals with van Hove singularities near the Fermi level can host intriguing quantum phenomena such as chiral loop currents, electronic nematicity, and unconventional superconductivity. However, to our best knowledge, unconventional magnetic states driven by van Hove singularities–like spin-density waves–have not been observed experimentally in kagome metals. Here, w…
Mar, 2025
Journal
Crystal field splittings and magnetic ground state of the square-lattice antiferromagnets YbBi2ClO4 and YbBi2IO4 with Jeff = 1/2
We report on the crystal field level splitting and magnetic ground state of the 𝐽eff=1/2 square lattice antiferromagnets YbBi2ClO4 and YbBi2IO4 using powder inelastic neutron scattering (INS) and neutron diffraction measurements. Both compounds exhibit a well-isolated Γ7 doublet ground state under a tetragonal crystal field environment, confirming a robust 𝐽eff=1/2 pictu…
Feb, 2025
Journal
Physical properties of intergrowth compound Eu2CuZn2P3
The physical properties of single-crystalline Eu2CuZn2P3 were inspected via thermodynamic, transport, and neutron diffraction measurements. Eu2CuZn2P3 is composed of EuCuP and EuZn2P2 motifs stacked in a one-to-one ratio. The magnetic response of Eu2CuZn2P3 is similar to that of EuZn2P2 in its A-type antiferromagnetic (semiconducting) state. A Néel temperature of 𝑇…