Magnetic field splitting of the spin resonance in CeCoIn5

Stock, C; Broholm, C; Zhao, Y; Demmel, F; Kang, HJ; Rule, KC; Petrovic, C

Magnetic field splitting of the spin resonance in CeCoIn5

Date

2012-10-17

Authors

Publisher

American Physical Society

Abstract

Neutron scattering in strong magnetic fields is used to show the spin resonance in superconducting CeCoIn(5) (T(c) = 2.3 K) is a doublet. The underdamped resonance ((h) over bar Gamma = 0.069 +/- 0.019 meV) Zeeman splits into two modes at E(+/-) = (h) over bar Omega(0) +/- mu(B mu 0)H with alpha = 0.96 +/- 0: 05. A linear extrapolation of the lower peak reaches zero energy at 11.2 +/- 0.5 T, near the critical field for the incommensurate "Q phase." Kenzelmann et al. [Science 321, 1652 (2008)] This, taken with the integrated weight and polarization of the low-energy mode (E(-)), indicates that the Q phase can be interpreted as a Bose condensate of spin excitons. © 2012, American Physical Society.

Keywords

Superconductivity, Polarization, Gamma radiation, Spin, Magnetic fields, Neutrons

Citation

Stock, C., Broholm, C., Zhao, Y., Demmel, F., Kang, H. J., Rule, K. C., & Petrovic, C. (2012). Magnetic field splitting of the spin resonance in CeCoIn5. Physical Review Letters, 109(16), 167207. doi:10.1103/PhysRevLett.109.167207