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Multiphase magnetism in Yb 2 Ti 2 O 7

https://doi.org/10.1073/pnas.2008791117

Scheie, Allen ; Kindervater, Jonas ; Zhang, Shu ; Changlani, Hitesh J. ; Sala, Gabriele ; Ehlers, Georg ; Heinemann, Andre ; Tucker, Gregory S. ; Koohpayeh, Seyed M. ; Broholm, Collin ( October 2020 , Proceedings of the National Academy of Sciences)

We use neutron scattering to show that ferromagnetism and antiferromagnetism coexist in the low T state of the pyrochlore quantum magnet ${Yb}_{2} {Ti}_{2} O_{7}$ . While magnetic Bragg peaks evidence long-range static ferromagnetic order, inelastic scattering shows that short-range correlated antiferromagnetism is also present. Small-angle neutron scattering provides direct evidence for mesoscale magnetic structure that we associate with metastable antiferromagnetism. Classical Monte Carlo simulations based on exchange interactions inferred from $⟨ 111 ⟩$ -oriented high-field spin wave measurements confirm that antiferromagnetism is metastable within the otherwise ferromagnetic ground state. The apparent lack of coherent spin wave excitations and strong sensitivity to quenched disorder characterizing ${Yb}_{2} {Ti}_{2} O_{7}$ is a consequence of this multiphase magnetism.

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Relative Alignment between the Magnetic Field and Molecular Gas Structure in the Vela C Giant Molecular Cloud Using Low- and High-density Tracers

https://doi.org/10.3847/1538-4357/ab1eb0

Fissel, Laura M. ; Ade, Peter A. ; Angilè, Francesco E. ; Ashton, Peter ; Benton, Steven J. ; Chen, Che-Yu ; Cunningham, Maria ; Devlin, Mark J. ; Dober, Bradley ; Friesen, Rachel ; et al ( June 2019 , The Astrophysical Journal)

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