Complex States, Emergent Phenomena & Superconductivity in Intermetallic & Metal-like Compounds


Project Leader(s):
Paul Canfield

Principal Investigators:
Sergey Bud'ko, Paul Canfield, John Clem, David Johnston, Adam Kaminski, Vladimir Kogan, Ruslan Prozorov, Makariy Tanatar,

Postdoctoral Research Associates:
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)


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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. abstract
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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. abstract
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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. abstract
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Vanevic M; Radovic Z; Kogan V G . 2013. Early stages of magnetization relaxation in superconductors. Physical Review B. 87:144501. abstract
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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. abstract
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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. abstract
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Murphy J; Strehlow C P; Cho K; Tanatar M A; Salovich N; Giannetta R W; Kobayashi T; Miyasaka S; Tajima S; Prozorov R . 2013. Nodal superconductivity in isovalently substituted SrFe2(As1-xPx)(2) pnictide superconductor at the optimal doping x=0.35. Physical Review B. 87:140505. abstract
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Weigand M; Civale L; Baca F J; Kim J; Bud'ko S L; Canfield P C; Maiorov B . 2013. Strong enhancement of the critical current at the antiferromagnetic transition in ErNi2B2C single crystals. Physical Review B. 87:140506. abstract
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Liu Y; Tanatar M A; Kogan V G; Kim H; Lograsso T A; Prozorov R . 2013. Upper critical field of high-quality single crystals of KFe2As2. Physical Review B. 87:134513. abstract
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Lin X; Straszheim W E; Bud'ko S L; Canfield P C . 2013. Anisotropic magnetization and resistivity of single crystalline RNi1-xBi2 +/- y (R = La-Nd, Sm, Gd-Dy). Journal of Alloys and Compounds. 554:304-311. abstract
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