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)
Ofer O; Baglo J C; Hossain M D; Kiefl R F; Hardy W N; Thaler A; Kim H; Tanatar M A; Canfield P C; Prozorov R; Luke G M; Morenzoni E; Saadaoui H; Suter A; Prokscha T; Wojek B M; Salman Z . 2012. Absolute value and temperature dependence of the magnetic penetration depth in Ba(Co0.074Fe0.926)(2)As-2. Physical Review B. 85:060506.
Pandey A; Dhaka R S; Lamsal J; Lee Y; Anand V K; Kreyssig A; Heitmann T W; McQueeney R J; Goldman A I; Harmon B N; Kaminski A; Johnston D C . 2012. Ba1-xKxMn2As2: An Antiferromagnetic Local-Moment Metal. Physical Review Letters. 108:087005.
Bergk B; Drechsler S L; Canfield P C; Wosnitza J . 2012. Detailed study of the de Haas-van Alphen effect in the Shubnikov state of LuNi2B2C. European Physical Journal B. 85:57.
Goetsch R J; Anand V K; Pandey A; Johnston D C . 2012. Structural, thermal, magnetic, and electronic transport properties of the LaNi2(Ge1-xPx)(2) system. Physical Review B. 85:054517.
Hu R W; Mun E D; Altarawneh M M; Mielke C H; Zapf V S; Bud'ko S L; Canfield P C . 2012. Upper critical fields and two-band superconductivity in Sr1-xEux(Fe0.89Co0.11)(2)As-2 (x=0.20 and 0.46). Physical Review B. 85:064511.
Cho K; Tanatar M A; Kim H; Straszheim W E; Ni N; Cava R J; Prozorov R . 2012. Doping-dependent superconducting gap anisotropy in the two-dimensional pnictide Ca(10)(Pt(3)As(8)) (Fe(1-x)Pt(x))(2)As(2) (5). Physical Review B. 85:020504.
Tanatar M A; Spyrison N; Cho K; Blomberg E C; Tan G T; Dai P C; Zhang C L; Prozorov R . 2012. Evolution of normal and superconducting properties of single crystals of Na(1-delta)FeAs upon interaction with environment. Physical Review B. 85:014510.
Mun E; Ko H; Miller G J; Samolyuk G D; Bud'ko S L; Canfield P C . 2012. Magnetic field effects on transport properties of PtSn4. Physical Review B. 85:035135.
Bulaevskii L N; Graf M J; Kogan V G . 2012. Vortex-assisted photon counts and their magnetic field dependence in single-photon superconducting detectors. Physical Review B. 85:014505.