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24 papers
Damping and softening of transverse acoustic phonons in colossal magnetoresistive LaCaMnO and LaSrMnO
Joel S. Helton, Yang Zhao, Dmitry A. Shulyatev +1
Neutron spectroscopy is used to probe transverse acoustic phonons near the (2, 2, 0) Bragg position in colossal magnetoresistive La0.7Ca0.3MnO3 and La0.7Sr0.3MnO3. Upon warming to…
Spin wave damping arising from phase coexistence below in colossal magnetoresistive LaCaMnO
Joel S. Helton, Susumu K. Jones, Daniel Parshall +3
While the spin dynamics of LaCaMnO in the ferromagnetic phase are known to be unconventional, previous measurements have yielded contradictory results regarding…
Magnetic transitions in the topological magnon insulator Cu(1,3-bdc)
R. Chisnell, J. S. Helton, D. E. Freedman +5
Topological magnon insulators are a new class of magnetic materials that possess topologically nontrivial magnon bands. As a result, magnons in these materials display properties a…
Correlated impurities and intrinsic spin liquid physics in the kagome material Herbertsmithite
Tian-Heng Han, M. R. Norman, J. -J. Wen +4
Low energy inelastic neutron scattering on single crystals of the kagome spin liquid compound ZnCu3(OD)6Cl2 (Herbertsmithite) reveals antiferromagnetic correlations between impurit…
Chemical pressure tuning of URuSi via isoelectronic substitution of Ru with Fe
Pinaki Das, N. Kanchanavatee, J. S. Helton +8
We have used specific heat and neutron diffraction measurements on single crystals of URuFeSi for Fe concentrations 0.7 to establish that chemical substi…
Polaron-mediated spin correlations in metallic and insulating LaMnO (=Ca, Sr, or Ba)
Joel S. Helton, Daniel M. Pajerowski, Yiming Qiu +6
Neutron spectroscopy measurements reveal short-range spin correlations near and above the ferromagnetic-paramagnetic phase transition in manganite materials of the form La$_{1-x}A_…