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)
Prozorov R; Tanatar M A; Gordon R T; Martin C; Kim H; Kogan V G; Ni N; Tillman M E; Bud'ko S L; Canfield P C . 2009. Anisotropic London penetration depth and superfluid density in single crystals of iron-based pnictide superconductors. Physica C-Superconductivity and Its Applications. 469:582-589.
Tanatar M A; Kreyssig A; Nandi S; Ni N; Bud'ko S L; Canfield P C; Goldman A I; Prozorov R . 2009. Direct imaging of the structural domains in the iron pnictides AFe(2)As(2) (A=Ca,Sr,Ba). Physical Review B. 79:180508.
Prozorov R; Tanatar M A; Blomberg E C; Prommapan P; Gordon R T; Ni N; Bud'ko S L; Canfield P C . 2009. Doping - Dependent irreversible magnetic properties of Ba(Fe1-xCox)(2)As-2 single crystals. Physica C-Superconductivity and Its Applications. 469:667-673.
Liu C; Kondo T; Palczewski A D; Samolyuk G D; Lee Y; Tillman M E; Ni N; Mun E D; Gordon R; Santander-Syro A F; Bud'ko S L; McChesney J L; Rotenberg E; Fedorov A V; Valla T; Copie O; Tanatar M A; Martin C; Harmo . 2009. Electronic properties of iron arsenic high temperature superconductors revealed by angle resolved photoemission spectroscopy (ARPES). Physica C-Superconductivity and Its Applications. 469:491-497.
Nath R; Singh Y; Johnston D C . 2009. Magnetic, thermal, and transport properties of layered arsenides BaRu2As2 and SrRu2As2. Physical Review B. 79:174513.
Sefat A S; Bud'ko S L; Canfield P C . 2009. Properties of RRe2Al10 (R=Y, Gd-Lu) crystals. Physical Review B. 79:174429.
Samuely P; Pribulova Z; Szabo P; Pristas G; Bud'ko S L; Canfield P C . 2009. Point contact Andreev reflection spectroscopy of superconducting energy gaps in 122-type family of iron pnictides. Physica C-Superconductivity and Its Applications. 469:507-511.
Mazin I I; Schmalian J . 2009. Pairing symmetry and pairing state in ferropnictides: Theoretical overview. Physica C-Superconductivity and Its Applications. 469:614-627.
Densmore J M; Das P; Rovira K; Blasius T D; DeBeer-Schmitt L; Jenkins N; Paul D M; Dewhurst C D; Bud'ko S L; Canfield P C; Eskildsen M R . 2009. Small-angle neutron scattering study of the vortex lattice in superconducting LuNi2B2C. Physical Review B. 79:174522.