Coexistence of ferromagnetism and superconductivity in CeO_{0.3}F_{0.7}BiS_{2}

Journal Article · Wed Jan 01 00:00:00 EST 2014 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.90.224410· OSTI ID:1185720

Lee, Jooseop ^[1]; Demura, S ^[2]; Stone, Matthew B ^[1]; Iida, Kazuki ^[1]; Ehlers, Georg ^[1]; Dela Cruz, Clarina R ^[1]; Matsuda, Masaaki ^[1]; Deguchi, K ^[2]; Mizuguchi, Y ^[2]; Miura, O ^[3]; Louca, Despina ^[4]; Lee, Seung-Hun ^[1]

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1. ORNL
2. National Institute for Materials Science, Tsukuba, Japan
3. Tokyo Metropolican University
4. University of Virginia

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 4.5 K. 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 eld, 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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1185720
• Journal Information: Physical Review B, Vol. 90, Issue 22; ISSN 1098--0121
• Country of Publication: United States
• Language: English