Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-06-23
Phys. Rev. Lett. 101, 039701 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
1 page, to appear in PRL
Scientific paper
10.1103/PhysRevLett.101.039701
The study of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state has been of considerable recent interest. Below the temperature $T^*$ which is believed to be the transition temperature ($T$) to the FFLO phase in CeCoIn$_5$, K. Kakuyanagi et al. (Phys. Rev. Lett. 94, 047602 (2005)) reported a composite NMR spectrum with a tiny component observed at frequencies corresponding to the normal state signal. The results were interpreted as evidence for the emergence of an FFLO state. This result is inconsistent with two other NMR studies of V. F. Mitrovi{\'c} et al. (Phys. Rev. Lett. 97, 117002 (2006)) and B.-L. Young et al. (Phys. Rev. Lett. 98, 036402 (2007)). In this comment we show that the findings of K. Kakuyanagi et al. do not reflect the true nature of the FFLO state but result from excess RF excitation power used in that experiment.
Berthier Claude
Flouquet Jacques
Horvatic Mladen
Klanjsek Martin
Koutroulakis G.
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