Final Report Page: 1 of 3
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Novel superconducting states in actinides and other anisotropic superconductors.
Charles CAgosta - PI July 1, 2005- Jan 31, 2011
Clark University, 950 Main Street, Worcester, MA 01610
The goal of this grant was to use a low temperature high magnetic field apparatus, coupled with a
tunnel diode oscillator (TDO) penetration depth measurement system to investigate novel
correlated electron phases in anisotropic superconductors. This grant resulted in three distinct
scientific advances, the most important being the discovery of a inhomogeneous superconducting
state first predicted over 40 years ago, and a number of broader impacts. A synopsis of the
products of the grant is that 4 papers were published and a experimental program was established
that continues to produce more data. As an example we published a paper in 2012 with the most
extensive experimental results on the subject of inhomogeneous superconductors ever published.
The broader impacts are that two graduate students received PhDs as a result of this grant, and a
major US high magnetic field facility was rebuilt.
The papers published directly due to the activity funded by the grant are:
William A. Coniglio, Laurel E. Winter, Kyuil Cho, and C. C. Agosta, B. Fravel, and L. K.
Montgomery, "Unusual phase diagram and FFLO signature in A-(BETS)2GaCl4 from RF
penetration depth measurements," ," Phys. Rev. B, 83, 224507 (2011).
K. Cho, H. Kim, M. A. Tanatar, Y J. Song, Y S. Kwon, W. A. Coniglio, C. C. Agosta, A.
Gurevich, and R. Prozorov, "Anisotropic upper critical field and possible Fulde-Ferrel-Larkin-
Ovchinnikov state in the stoichiometric pnictide superconductor LiFeAs," Phys. Rev. B, 83,
060502(R) (2011). Rapid Communication
http://prb.aps. org/ab stract/PRB/v83/i6/e060502
T. Coffey, C. Martin, C. C. Agosta, and M. Tokumoto, "A bulk 2D Pauli Limited
Superconductor," Phys. Rev. B, 82, 212502 (2010).
K. Cho, B. E. Smith, W. A. Coniglio, L. E. Winter, C. C. Agosta, and J. A. Schlueter, "Upper
critical field study in the organic superconductor (3"- (ET)2SFsCH2CF2S03: Possibility of the
Fulde-Ferrell-Larkin-Ovchinnikov state," Phys. Rev. B, 79, 220507(R) (2009). (picked as an
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Agosta, Charles C. Final Report, report, June 14, 2013; United States. (digital.library.unt.edu/ark:/67531/metadc846544/m1/1/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.