Field dependence of antiferromagnetic spin fluctuations in the heavy fermion superconductor CeCoIn$_5$
ORAL
Abstract
Magnetic fields are proposed as a tuning parameter for quantum critical fluctuations in the heavy fermion superconductor CeCoIn$_5$, with a critical point close to the superconducting $B_{c2}$. Here, $^{59}$Co NMR spin lattice relaxation is used to study the effect of magnetic field applied on the amplitude, dimensionality, and anisotropy of antiferromagnetic spin fluctuations for temperatures covering $T$=100mK-100K and $B=$5-10T ($\parallel {\mathbf c}$). Spin fluctuations are evident for temperatures below $T\sim40$K, below which $[T_1T]^{-1}$ increases markedly for all fields. At lower temperatures, a significant dependence on magnetic field is observed. For fields $B>B_{c2}=$5T, $[T_1T]^{-1}\to$constant for $T
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Authors
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S. E. Brown
UCLA Physics and Astronomy, UCLA, Phys. \& Astron., UCLA, University of California, Los Angeles
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H. Sakai
Los Alamos National Laboratory
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S.-H. Baek
Los Alamos National Laboratory
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Filip Ronning
Los Alamos National Laboratory, LANL
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Eric D. Bauer
Los Alamos National Laboratory, New Mexico, USA, Los Alamos National Laboratory, LANL, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA, Los Alamos National Lab
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J.D. Thompson
Los Alamos National Laboratory, LANL, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA