Field-induced quantum critical point in CeCoIn 5

• Published in: Physica. C, Superconductivity Vol. 408; pp. 705 - 706
• Main Authors: Paglione, Johnpierre, Tanatar, M.A., Hawthorn, D.G., Boaknin, Etienne, Hill, R.W., Ronning, F., Sutherland, M., Taillefer, Louis, Petrovic, C., Canfield, P.C.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-08-2004
• Subjects: Heavy-fermion superconductor; Non-Fermi liquid behavior; Quantum critical point; Quantum critical point; Non-Fermi liquid behavior; Heavy-fermion superconductor
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2004.03.120

The resistivity of CeCoIn
5 was measured down to 20 mK in magnetic fields of up to 16 T. With increasing field, we observe a suppression of the non-Fermi liquid behavior,
ρ∼
T, and the development of a Fermi liquid state, with its characteristic
ρ=
ρ
0+
AT
2 dependence. The field dependence of the
T
2 coefficient shows critical behavior with an exponent of ∼4/3. This is evidence for a new field-induced quantum critical point, occurring in this case at a critical field which coincides with the superconducting upper critical field
H
c2.