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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Liu C; Kondo T; Palczewski A D; Samolyuk G D; Lee Y; Tillman M E; Ni N; Mun E D; Gordon R; Santander-Syro A F; Bud'ko S L; McChesney J L; Rotenberg E; Fedorov A V; Valla T; Copie O; Tanatar M A; Martin C; Harmo . 2009. Electronic properties of iron arsenic high temperature superconductors revealed by angle resolved photoemission spectroscopy (ARPES). Physica C-Superconductivity and Its Applications. 469:491-497. abstract
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Nath R; Singh Y; Johnston D C . 2009. Magnetic, thermal, and transport properties of layered arsenides BaRu2As2 and SrRu2As2. Physical Review B. 79:174513. abstract
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Sefat A S; Bud'ko S L; Canfield P C . 2009. Properties of RRe2Al10 (R=Y, Gd-Lu) crystals. Physical Review B. 79:174429. abstract
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Samuely P; Pribulova Z; Szabo P; Pristas G; Bud'ko S L; Canfield P C . 2009. Point contact Andreev reflection spectroscopy of superconducting energy gaps in 122-type family of iron pnictides. Physica C-Superconductivity and Its Applications. 469:507-511. abstract
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Mazin I I; Schmalian J . 2009. Pairing symmetry and pairing state in ferropnictides: Theoretical overview. Physica C-Superconductivity and Its Applications. 469:614-627. abstract
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Densmore J M; Das P; Rovira K; Blasius T D; DeBeer-Schmitt L; Jenkins N; Paul D M; Dewhurst C D; Bud'ko S L; Canfield P C; Eskildsen M R . 2009. Small-angle neutron scattering study of the vortex lattice in superconducting LuNi2B2C. Physical Review B. 79:174522. abstract
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Khasanov R; Kondo T; Strassle S; Heron D O G; Kaminski A; Keller H; Lee S L; Takeuchi T . 2009. Zero-field superfluid density in a d-wave superconductor evaluated from muon-spin-rotation experiments in the vortex state. Physical Review B. 79:180507. abstract
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Liu C; Kondo T; Ni N; Palczewski A D; Bostwick A; Samolyuk G D; Khasanov R; Shi M; Rotenberg E; Bud'ko S L; Canfield P C; Kaminski A . 2009. Three- to Two-Dimensional Transition of the Electronic Structure in CaFe2As2: A Parent Compound for an Iron Arsenic High-Temperature Superconductor. Physical Review Letters. 102:167004. abstract
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Rathnayaka K D D; Naugle D G; Belevtsev B I; Canfield P C; Budko S L . 2009. Low-temperature metamagnetic states in single crystal TbNi2B2C studied by torque magnetometry. Journal of Applied Physics. 105:07e111. abstract
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Tanatar M A; Ni N; Samolyuk G D; Bud'ko S L; Canfield P C; Prozorov R . 2009. Resistivity anisotropy of AFe(2)As(2) (A=Ca, Sr, Ba): Direct versus Montgomery technique measurements. Physical Review B. 79:134528. abstract
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