Coexistence of ferromagnetism and superconductivity in CeO0.3F0.7BiS2.

Authors :: Lee, J.
Demura, S.
Stone, M. B.
Iida, K.
Ehlers, G.
dela Cruz, C. R.
Matsuda, M.
Deguchi, K.
Takano, Y.
Mizuguchi, Y.
Miura, O.
Louca, D.
Lee, S.-H.
Source :: Physical Review B: Condensed Matter & Materials Physics. Dec2014, Vol. 90 Issue 22, p224410-1-224410-8. 8p.
Publication Year :: 2014
Abstract: Bulk magnetization, transport, and neutron scattering measurements were performed to investigate the electronic and magnetic properties of a polycrystalline sample of the newly discovered ferromagnetic superconductor, CeO0.3F0.7BiS2. Ferromagnetism develops below TFM=6.54(8)K and superconductivity is found to coexist with the ferromagnetic state below TSC ~ 4.5K. Inelastic neutron scattering measurements reveal a very weakly dispersive magnetic excitation at 1.8 meV that can be explained by an Ising-like spin Hamiltonian. Under application of an external magnetic field, the direction of the magnetic moment changes from the c axis to the ab plane and the 1.8 meV excitation splits into two modes. A possible mechanism for the unusual magnetism and its relation to superconductivity is discussed. [ABSTRACT FROM AUTHOR]