Helen Walker

activity

20142021

most citedResonant x-ray spectroscopy of uranium intermetallics at the U

M_{4, 5}

edges

56 citations · 181 across the 6 of their papers we have counts for

collaborators

6 papers

cond-mat.str-el2021★ 9 cited

From one- to two-magnon excitations in the S=3/2 magnet $β$ -CaCr $_{2}$ O $_{4}$

M. Songvilay, S. Petit, F. Damay +7

We apply neutron spectroscopy to measure the magnetic dynamics in the S=3/2 magnet $β$ -CaCr $_{2}$ O $_{4}$ (T $_{N}$ =21 K). The low-energy fluctuations, in the ordered state, resemble large…

cond-mat.str-el2020

Charge disproportionation and nano phase separation in $R$ SrNiO $_{4}$

H. Guo, Z. W. Li, C. F. Chang +16

We have successfully grown centimeter-sized layered $R$ SrNiO $_{4}$ single crystals under high oxygen pressures of 120 bar by the floating zone technique. This enabled us to perform n…

cond-mat.str-el2018★ 15 cited

Anharmonic magnon excitations in noncollinear and charge-ordered RbFe $^{2 +}$ Fe $^{3 +}$ F $_{6}$

M. Songvilay, E. E. Rodriguez, R. Lindsay +4

RbFe $^{2 +}$ Fe $^{3 +}$ F $_{6}$ is an example of a charge ordered antiferromagnet where iron sites, with differing valences, are structurally separated into two interpenetrating sublatti…

cond-mat.str-el2018★ 52 cited

Tuning the $S = 1/2$ square-lattice antiferromagnet Sr $_{2}$ Cu(Te $_{1 - x}$ W $_{x}$ )O $_{6}$ from Néel order to quantum disorder to columnar order

O. Mustonen, S. Vasala, K. P. Schmidt +6

The spin-1/2 square-lattice Heisenberg model is predicted to have a quantum disordered ground state when magnetic frustration is maximized by competing nearest-neighbor $J_{1}$ and n…

cond-mat.str-el2017★ 56 cited

Resonant x-ray spectroscopy of uranium intermetallics at the U $M_{4, 5}$ edges

K. O. Kvashnina, H. C. Walker, N. Magnani +2

We present resonant x-ray emission spectroscopic (RXES) data from the uranium intermetallics UPd $_{3}$ , USb, USn $_{3}$ and URu $_{2}$ Si $_{2}$ , at the U $M_{4, 5}$ edges and compare the data…

cond-mat.str-el2014★ 49 cited

Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet Sr $_{3}$ Fe $_{2}$ O $_{7}$

J. -H. Kim, Anil Jain, M. Reehuis +12

We report a neutron scattering study of the magnetic order and dynamics of the bilayer perovskite Sr $_{3}$ Fe $_{2}$ O $_{7}$ , which exhibits a temperature-driven metal-insulator transition…

From one- to two-magnon excitations in the S=3/2 magnet β-CaCr2​O4​

Charge disproportionation and nano phase separation in RSrNiO4​

Anharmonic magnon excitations in noncollinear and charge-ordered RbFe2+Fe3+F6​

Tuning the S=1/2 square-lattice antiferromagnet Sr2​Cu(Te1−x​Wx​)O6​ from Néel order to quantum disorder to columnar order

Resonant x-ray spectroscopy of uranium intermetallics at the U M4,5​ edges