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)
Lippman T M; Kalisky B; Kim H; Tanatar M A; Bud'ko S L; Canfield P C; Prozorov R; Moler K A . 2012. Agreement between local and global measurements of the London penetration depth. Physica C-Superconductivity and Its Applications. 483:91-93.
Bud'ko S L; Liu Y; Lograsso T A; Canfield P C . 2012. Hydrostatic and uniaxial pressure dependence of superconducting transition temperature of KFe2As2 single crystals. Physical Review B. 86:224514.
Gati E; Kohler S; Guterding D; Wolf B; Knoner S; Ran S; Bud'ko S L; Canfield P C; Lang M . 2012. Hydrostatic-pressure tuning of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe1-xCox)(2)As-2. Physical Review B. 86:220511.
Clem J R; Kogan V G . 2012. Kinetic impedance and depairing in thin and narrow superconducting films. Physical Review B. 86:174521.
Anand V K; Johnston D C . 2012. Observation of a phase transition at 55 K in single-crystal CaCu1.7As2. Physical Review B. 86:214501.
Kogan V G; Prozorov R . 2012. Orbital upper critical field and its anisotropy of clean one- and two-band superconductors. Reports on Progress in Physics. 75:114502.
Spyrison N; Tanatar M A; Cho K; Song Y; Dai P C; Zhang C L; Prozorov R . 2012. Environmental stability and anisotropic resistivity of Co-doped Na1-delta Fe1-xCoxAs. Physical Review B. 86:144528.
Kim M G; Lamsal J; Heitmann T W; Tucker G S; Pratt D K; Khan S N; Lee Y B; Alam A; Thaler A; Ni N; Ran S; Bud'ko S L; Marty K J; Lumsden M D; Canfield P C; Harmon B N; Johnson D D; Kreyssig A; McQueeney R J; Goldman A I . 2012. Effects of Transition Metal Substitutions on the Incommensurability and Spin Fluctuations in BaFe2As2 by Elastic and Inelastic Neutron Scattering. Physical Review Letters. 109:167003.
Das P; Densmore J M; Rastovski C; Schlesinger K J; Laver M; Dewhurst C D; Littrell K; Bud'ko S L; Canfield P C; Eskildsen M R . 2012. Field dependence of the superconducting basal plane anisotropy of TmNi2B2C. Physical Review B. 86:144501.