Complex States, Emergent Phenomena & Superconductivity in Intermetallic & Metal-like Compounds
Kyuil Cho, Abhishek Pandey
The specific scientific question to be addressed by this Project is—can we develop, discover, understand and ultimately control, and predictably modify new and extreme examples of complex states, emergent phenomena, and superconductivity? Materials manifesting clear or compelling examples (or combinations) of superconductivity, strongly correlated electrons, quantum criticality, and exotic, bulk magnetism are of particular interest given their potential to lead to revolutionary steps forward in our understanding of their complex, and potentially energy relevant, properties. Experiment and theory are implemented synergistically. The experimental work consists of new materials development and crystal growth, combined with detailed and advanced measurements of microscopic, thermodynamic, and transport properties, as well as electronic structure, at extremes of pressure, temperature, magnetic field and resolution. The theoretical work focuses on modeling transport, thermodynamic and spectroscopic properties using world-leading, phenomenological approaches to superconductors and modern quantum many-body theory.
The ability to address these questions is illustrated by this group’s past work on many of the key systems and phenomena that have defined this field over the past decades: High Tc oxide, RNi2B2C and MgB2 superconductivity, Ce-, Yb- and transition metal-based heavy fermions, quantum criticality, quasicrystals, spin glasses, spin ladders / spin chains, vortex and domain pattern formation, ferromagnetism and metamagnetism.
- Design and growth (P. C. Canfield, S. Bud’ko, D. C. Johnston, J. Schmalian,V. Kogan)
- Advanced Characterization (S. Bud’ko, Y. Furukawa, A. Kaminski, R. Prozorov, M. Tanatar)
- Theory and modeling (J. R. Clem, V. Kogan, J. Schmalian)
Yeninas S; Pandey A; Ogloblichev V; Mikhalev K; Johnston D C; Furukawa Y . 2013. Metal-insulator transition in antiferromagnetic Ba1-xKxMn2As2 (0 <= x <= 0.4) single crystals studied by Mn-55 and As-75 NMR. Physical Review B. 88:241111.
Yuen C D; Miller G J; Lei H P; Wang C Z; Thiel P A . 2013. Structure of the clean Gd5Ge4(010) surface. Journal of Physics-Condensed Matter. 25:485002.
Dioguardi A P; Crocker J; Shockley A C; Lin C H; Shirer K R; Nisson D M; Lawson M M; apRoberts-Warren N; Canfield P C; Bud'ko S L; Ran S; Curro N J . 2013. Coexistence of Cluster Spin Glass and Superconductivity in Ba(Fe1-xCox)(2)As-2 for 0.060 <= x <= 0.071. Physical Review Letters. 111:207201.
Johnston D C . 2013. Elaboration of the alpha-model derived from the BCS theory of superconductivity. Superconductor Science & Technology. 26:115011.
Roy B; Pandey A; Zhang Q; Heitmann T W; Vaknin D; Johnston D C; Furukawa Y . 2013. Experimental evidence of a collinear antiferromagnetic ordering in the frustrated CoAl2O4 spinel. Physical Review B. 88:174415.
Soh J H; Tucker G S; Pratt D K; Abernathy D L; Stone M B; Ran S; Bud'ko S L; Canfield P C; Kreyssig A; McQueeney R J; Goldman A I . 2013. Inelastic Neutron Scattering Study of a Nonmagnetic Collapsed Tetragonal Phase in Nonsuperconducting CaFe2As2: Evidence of the Impact of Spin Fluctuations on Superconductivity in the Iron-Arsenide Compounds. Physical Review Letters. 111:227002.
Zhang Q; Tian W; Li H F; Kim J W; Yan J Q; McCallum R W; Lograsso T A; Zarestky J L; Bud'ko S L; McQueeney R J; Vaknin D . 2013. Magnetic structures and interplay between rare-earth Ce and Fe magnetism in single-crystal CeFeAsO. Physical Review B. 88:174517.
Smetana V; Corbett J D; Miller G J . 2013. Na8Au9.8(4)Ga7.2 and Na17Au15.87(2)Ga46.63: The diversity of pseudo 5-fold 0 Cross Mark symmetries in the Na-Au-Ga system. Journal of Solid State Chemistry. 207:21-28.
Smetana V; Miller G J; Corbett J D . 2013. Polyclusters and Substitution Effects in the Na-Au-Ga System: Remarkable Sodium Bonding Characteristics in Polar Intermetallics. Inorganic Chemistry. 52:12502-12510.