Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-09-21
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.94.047001
Measurements of specific heat and electrical resistivity in magnetic fields up to 9 T along [001] and temperatures down to 50 mK of Sn-substituted CeCoIn5 are reported. The maximal -ln(T) divergence of the specific heat at the upper critical field H_{c2} down to the lowest temperature characteristic of non-Fermi liquid systems at the quantum critical point (QCP), the universal scaling of the Sommerfeld coefficient, and agreement of the data with spin-fluctuation theory, provide strong evidence for quantum criticality at H_{c2} for all x < 0.12 in CeCoIn5-xSnx. These results indicate the "accidental" coincidence of the QCP located near H_{c2} in pure CeCoIn5, in actuality, constitute a novel quantum critical point associated with unconventional superconductivity.
Bauer Eric D.
Capan Cigdem
Movshovich Roman
Ronning Filip
Sarrao John L.
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