A new heavy-fermion superconductor : A relative of the cuprates?
Condensed Matter and Thermal Physics, Los Alamos National
Laboratory Los Alamos, NM 87545 USA
2 National High Magnetic Field Laboratory, Florida State University Tallahassee, FL 32306 USA
Corresponding author: firstname.lastname@example.org
Accepted: 22 November 2000
is a member of a new family of heavy-fermion compounds and has a Sommerfeld specific-heat coefficient of . It exhibits a bulk, thermodynamic transition to a superconducting state at , below which the specific heat decreases as T2 to a small residual T-linear value. Surprisingly, the electrical resistivity drops below instrumental resolution at a much higher temperature . These behaviors are highly reproducible and field-dependent studies indicate that T0 and arise from the same underlying electronic structure. The layered crystal structure of suggests a possible analogy to the cuprates in which spin/charge pair correlations develop well above .
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 74.70.Tx – Heavy-fermion superconductors
© EDP Sciences, 2001