1,595 research outputs found
59Co Nuclear Quadrupole Resonance Studies of Superconducting and Non-superconducting Bilayer Water Intercalated Sodium Cobalt Oxides NaxCoO2.yH2O
We report 59Co nuclear quadrupole resonance (NQR) studies of bilayer water
intercalated sodium cobalt oxides NaxCoO2.yH2O (BLH) with the superconducting
transition temperatures, 2 K < T_c <= 4.6 K, as well as a magnetic BLH sample
without superconductivity. We obtained a magnetic phase diagram of T_c and the
magnetic ordering temperature T_M against the peak frequency nu_3 59Co NQR
transition I_z = +- 5/2 +-7/2 and found a dome shape superconducting phase.
The 59Co NQR spectrum of the non-superconducting BLH shows a broadening below
T_M without the critical divergence of 1/T_1 and 1/T_2, suggesting an
unconventional magnetic ordering. The degree of the enhancement of 1/T_1T at
low temperatures increases with the increase of nu_3 though the optimal
nu_3~12.30 MHz. In the NaxCoO2.yH2O system, the optimal-T_c superconductivity
emerges close to the magnetic instability. T_c is suppressed near the phase
boundary at nu_3~12.50 MHz, which is not a conventional magnetic quantum
critical point.Comment: 4 pages, 5 figure
Observation of Split Isobaric-Analog-State in 56Co through the 56Fe(p,n)56CO Reaction
開始ページ、終了ページ: 冊子体のページ付
Observation of T=1 and T=0 Gamow-Teller States in the 54Fe(p,n)54CO Reaction
開始ページ、終了ページ: 冊子体のページ付
Excitation of ΔL = 1, ΔS = 0 Giant Resonances in the (p,n) Reactions on 90Zr, 120Sn, 140Ce and 208Pb at Ep = 41 MeV
開始ページ、終了ページ: 冊子体のページ付
The (p,n) Reaction on Cadmium Isotopes Leading to the Ground- and Excited-State Analogs
開始ページ、終了ページ: 冊子体のページ付
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