Neutron Scattering Studies of Emergent Phenomena in Strongly-correlated Electron Materials
| Date/Time: | Tuesday, 14 Apr 2015 from 4:10 pm to 5:00 pm |
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| Location: | Physics 0003 |
| Phone: | 515-294-5441 |
| Channel: | College of Liberal Arts and Sciences |
| Actions: | Download iCal/vCal | Email Reminder |
Abstract: Strongly-correlated electron materials possess strong coupling between their charge, spin, orbital, and lattice degrees of freedom. Such coupling may give rise to novel macroscopic states and physical properties that cannot be completely described by theories based on non-interacting electron pictures. Neutron scattering is an invaluable experimental tool which allows one to measure the microscopic interactions within materials, as well as any long-range structural and/or magnetic order associated with a particular macroscopic state. For this talk, I will first give an overview of my recent work, which has focused on identifying and understanding phenomena associated with magnetoelectric coupling, magnetic frustration, and quantum fluctuations in strongly-correlated materials [1-5]. I will then present more detailed results from recent neutron scattering experiments on the heavy-electron compounds CeCu4Ga [1] and YbBiPt [2].
[1] B.G. Ueland, C.F. Miclea, K. Gofryk, Y. Qiu, F. Ronning, R. Movshovich, E.D. Bauer, J.S. Gardner, and J.D. Thompson, Phys. Rev. B 90, 121109R (2014).
[2] B.G. Ueland, A. Kreyssig, K. Prokes, J.W. Lynn, L.W. Harriger, D.K. Pratt, D. K. Singh, T.W. Heitmann, S. Sauerbrei, S.M. Saunders, E. D. Mun, S. L. Bud'ko, R. J. McQueeney, P.C. Canfield, and A. I. Goldman, Phys. Rev. B 89, 180403R (2014).
[3] Abhishek Pandey, B.G. Ueland, S. Yeninas, A. Kreyssig, A. Sapkota, Yang Zhao, J.S. Helton, J.W. Lynn, R.J. McQueeney, Y. Furukawa, A.I. Goldman, and D.C. Johnston, Phys. Rev. Lett. 111, 047001 (2013).
[4] B.G. Ueland, C.F. Miclea, Yasuyuki Kato, O. Ayala-Valenzuela, R.D. McDonald, R. Okazaki, P.H. Tobash, M.A. Torrez, F. Ronning, R. Movshovich, Z. Fisk, E.D. Bauer, Ivar Martin, and J.D. Thompson, Nat. Commun. 3, 1067 (2012).
[5] S. Yanez-Vilar, E.D. Mun, V.S. Zapf, B.G. Ueland, J.S. Gardner, J.D. Thompson, J. Singleton, M. Sanchez-Andujar, J. Mira, N. Biskup, M.A. Senars-Rodrguez, and C.D. Batista, Phys. Rev. B 84, 134428R (2011).
Bio: Ben Ueland earned his B.A. in 2000 and his M.S. in 2001, both from Binghamton University. He joined Peter Schiffer's group at the Pennsylvania State University in 2001, and obtained his PhD in 2007. His thesis work focused on examining cooperative magnetic relaxation effects in geometrically frustrated magnetic oxides by performing low temperature magnetization and ac magnetic susceptibility experiments utilizing a 3He/4He dilution refrigerator. He joined the NIST Center for Neutron Research as an NRC Postdoctoral Associate to learn neutron scattering techniques while studying magnetoelectric and magnetostructural coupling in manganites under the tutelage of Jeffrey Lynn. In 2010, he joined Joe Thompson at the Condensed Matter Magnet Science Group at Los Alamos National Laboratory as a G. T. Seaborg Institute Postdoctoral Associate, and investigated the effects of magnetic frustration in various strongly-correlated metals. Since December 2012, Ben has been a Postdoctoral Associate at Iowa State University and Ames Laboratory, performing neutron and x-ray scattering experiments under the guidance of Alan Goldman, Andreas Kreyssig, and Robert McQueeney. His work at Iowa State and Ames includes studying the magnetism associated with the magnetic field induced quantum critical point in the heavy-fermion YbBiPt, identifying the emergent itinerant ferromagnetism in K-doped BaMn2As2, and studying magnetostructural coupling and magnetic excitations in SrCo2As2, CaCo2As2, and related materials. He also has active offsite collaborations which study frustration-induced magnetic order and magnetoelectric coupling in the multiferroic Lu2MnCoO6 and the heavy-fermion UCu5, and the evolution of short-range magnetic correlations in the heavy-electron compounds CeCu5-xGax.