Quasparticle Spin Susceptibility in Heavy-Fermion Superconductors : An NMR Study Compared with Specific Heat Results(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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Quasiparticle spin susceptibility (χ^<qp>) for various heavy-fermion (HF) superconductors is discussed on the basis of the experimental results of NMR Knight shift (K), NMR relaxation rate (1/T_1), and electronic specific heat (γ_<el>) within the framework of the Fermi liquid model for a Kramers doublet crystal electric field (CEF) ground state. χ_γ is calculated from the enhanced Sommerfeld coefficient γ_<el>, and χ<T_1> from the quasiparticle Korringa relation T_1T(K_<T_1>)^2=const. via the relation of χ_<T_1>=(N_<AμB/A_<hf>>)K_<T_1> where A_<hf> is the hyperfine coupling constant, N_A the Abogadoro's number and μ_B the Bohr magneton. For the even-parity (spin-singlet) superconductors CeCu_2Si_2, CeCoIn_5 and UPd_2Al_3, the fractional decrease in the Knight shift, δK^<obs>=K^<obs>(T_c)-K^<obs>(T→0), below the superconducting transition temperature (T_c) is due to the decrease of the spin susceptibility of heavy quasiparticle estimated consistently from χ_γ and χ_<T_1>. This result allows us to conclude that the heavy quasiparticles form the spin-singlet Cooper pairs in CeCu_2Si_2, CeCoIn_5 and UPd_2Al_3. On the other hand, no reduction in the Knight shift is observed in UPt_3 and UNi_2Al_3, nevertheless the estimated values of χ_γ and χ_<T_1> are large enough to be probed experimentally. The odd-parity superconductivity is therefore concluded in these compounds. The NMR Knight shift results provide a convincing way to classify the HF superconductors into either even-or odd-parity pairing.
- 2005-04-15
著者
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Tou Hideki
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Kitaoka Yoshio
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Ishida Kenji
Department of Applied Chemistry, Ibaraki University
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