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)
Salovich N W; Kim H; Ghosh A K; Giannetta R W; Kwok W; Welp U; Shen B; Zhu S; Wen H H; Tanatar M A; Prozorov R . 2013. Effect of heavy-ion irradiation on superconductivity in Ba0.6K0.4Fe2As2. Physical Review B. 87:180502.
Blomberg E C; Tanatar M A; Fernandes R M; Mazin I I; Shen B; Wen H H; Johannes M D; Schmalian J; Prozorov R . 2013. Sign-reversal of the in-plane resistivity anisotropy in hole-doped iron pnictides. Nature Communications. 4:1914.
Liu J; Smetana V; Gschneidner K A; Miller G J; Pecharsky V K . 2013. The crystal structure and magnetic properties of Pr117Co56.7Ge112. Journal of Applied Physics. 113:17e120.
Lin X; Bud'ko S L; Thimmaiah S; Canfield P C . 2013. Anisotropic magnetization, resistivity and heat capacity of single crystalline R3Ni2-xSn7 (R=La, Ce, Pr and Nd). Journal of Magnetism and Magnetic Materials. 331:53-61.
Allan M P; Chuang T M; Massee F; Xie Y; Ni N; Bud'ko S L; Boebinger G S; Wang Q; Dessau D S; Canfield P C; Golden M S; Davis J C . 2013. Anisotropic impurity states, quasiparticle scattering and nematic transport in underdoped Ca(Fe1-xCox)(2)As-2. Nature Physics. 9:220-224.
Dong J K; Tokiwa Y; Bud'ko S L; Canfield P C; Gegenwart P . 2013. Anomalous Reduction of the Lorenz Ratio at the Quantum Critical Point in YbAgGe. Physical Review Letters. 110:176402.
Vanevic M; Radovic Z; Kogan V G . 2013. Early stages of magnetization relaxation in superconductors. Physical Review B. 87:144501.
Bossoni L; Carretta P; Horvatic M; Corti M; Thaler A; Canfield P C . 2013. Glassy transition in the vortex lattice of Ba(Fe0.93Rh0.07)(2)As-2 superconductor probed by NMR and ac-susceptibility. EPL. 102:17005.
Kim M G; Tucker G S; Pratt D K; Ran S; Thaler A; Christianson A D; Marty K; Calder S; Podlesnyak A; Bud'ko S L; Canfield P C; Kreyssig A; Goldman A I; McQueeney R J . 2013. Magnonlike Dispersion of Spin Resonance in Ni-doped BaFe2As2. Physical Review Letters. 110:177002.