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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Jayasekara W; Lee Y; Pandey A; Tucker G S; Sapkota A; Lamsal J; Calder S; Abernathy D L; Niedziela J L; Harmon B N; Kreyssig A; Vaknin D; Johnston D C; Goldman A I; McQueeney R J . 2013. Stripe Antiferromagnetic Spin Fluctuations in SrCo2As2. Physical Review Letters. 111:157001. abstract
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Clem J R; Prozorov R; Wijngaarden R J . 2013. Equilibrium intermediate-state patterns in a type-I superconducting slab in an arbitrarily oriented applied magnetic field. Physical Review B. 88:104504. abstract
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Bossoni L; Carretta P; Halperin W P; Oh S; Reyes A; Kuhns P; Canfield P C . 2013. Evidence of unconventional low-frequency dynamics in the normal phase of Ba(Fe1-xRhx)(2)As-2 iron-based superconductors. Physical Review B. 88:100503. abstract
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Tokiwa Y; Garst M; Gegenwart P; Bud'ko S L; Canfield P C . 2013. Quantum Bicriticality in the Heavy-Fermion Metamagnet YbAgGe. Physical Review Letters. 111:116401. abstract
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Lin X; Taufour V; Bud'ko S L; Canfield P C . 2013. Suppression of ferromagnetism in the LaVxCr1-xGe3 system. Physical Review B. 88:094405. abstract
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Fang X K; Hansen L; Haso F; Yin P C; Pandey A; Engelhardt L; Slowing I; Li T; Liu T B; Luban M; Johnston D C . 2013. {Mo24Fe12} Macrocycles: Anion Templation with Large Polyoxometalate Guests. Angewandte Chemie-International Edition. 52:10500-10504. abstract
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Hodovanets H; Bud'ko S L; Lin X; Taufour V; Kim M G; Pratt D K; Kreyssig A; Canfield P C . 2013. Anisotropic transport and magnetic properties and magnetic-field tuned states of CeZn11 single crystals. Physical Review B. 88:054410. abstract
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Xie W W; Thimmaiah S; Lamsal J; Liu J; Heitmann T W; Quirinale D; Goldman A I; Pecharsky V; Miller G J . 2013. beta-Mn-Type Co8+xZn12-x as a Defect Cubic Laves Phase: Site Preferences, Magnetism, and Electronic Structure. Inorganic Chemistry. 52:9399-9408. abstract
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Murphy J; Tanatar M A; Kim H; Kwok W; Welp U; Graf D; Brooks J S; Bud'ko S L; Canfield P C; Prozorov R . 2013. Effect of heavy-ion irradiation on London penetration depth in overdoped Ba(Fe1-xCox)(2)As-2. Physical Review B. 88:054514. abstract
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Normile P S; Rotter M; Detlefs C; Jensen J; Canfield P C; Blanco J A . 2013. Magnetic ordering in GdNi2B2C revisited by resonant x-ray scattering: Evidence for the double-q model. Physical Review B. 88:054413. abstract
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