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; Ni N; Kreyssig A; Nandi S; Bud'ko S L; Goldman A I; Canfield P C . 2009. Intrinsic pinning on structural domains in underdoped single crystals of Ba(Fe1-xCox)(2)As-2. Physical Review B. 80:174517.
Torikachvili M S; Bud'ko S L; Ni N; Canfield P C . 2009. Hydrostatic pressure study of the structural phase transitions and superconductivity in single crystals of (Ba1-xKx)Fe2As2 (x=0 and 0.45) and CaFe2As2. Physica B-Condensed Matter. 404:3223-3226.
Szabo P; Pribulova Z; Pristas G; Bud'ko S L; Canfield P C; Samuely P . 2009. Two gap superconductivity in Ba0.55K0.45Fe2As2 single crystals studied by the directional point-contact Andreev reflection spectroscopy. Physica B-Condensed Matter. 404:3220-3222.
Bud'ko S L; Canfield P C; Sefat A S; Sales B C; McGuire M A; Mandrus D . 2009. Anisotropic thermal expansion of Fe1.06Te and FeTe0.5Se0.5 single crystals. Physical Review B. 80:134523.
Gapud A A; Moraes S; Khadka R P; Favreau P; Henderson C; Canfield P C; Kogan V G; Reyes A P; Lumata L L; Christen D K; Thompson J R . 2009. Flux quanta driven by high-density currents in low-impurity V3Si and LuNi2B2C: Free flux flow and fluxon-core size effect. Physical Review B. 80:134524.
Luo X G; Tanatar M A; Reid J P; Shakeripour H; Doiron-Leyraud N; Ni N; Bud'ko S L; Canfield P C; Luo H Q; Wang Z S; Wen H H; Prozorov R; Taillefer L . 2009. Quasiparticle heat transport in single-crystalline Ba(1-x)KxFe(2)As(2): Evidence for a k-dependent superconducting gap without nodes. Physical Review B. 80:140503.
Ivanshin V A; Litvinova T O; Sukhanov A A; Sokolov D A; Aronson M C . 2009. Electron spin resonance in the Heusler alloy YbRh2Pb. Jetp Letters. 90:116-119.
Singh Y; Green M A; Huang Q; Kreyssig A; McQueeney R J; Johnston D C; Goldman A I . 2009. Magnetic order in BaMn2As2 from neutron diffraction measurements. Physical Review B. 80:100403.
Jia S; Ni N; Bud'ko S L; Canfield P C . 2009. Magnetic properties of RFe2Zn20 and RCo2Zn20 (R=Y, Nd, Sm, Gd-Lu). Physical Review B. 80:104403.