1,058 research outputs found
Electrochemical synthesis and properties of CoO2, the x = 0 phase of the AxCoO2 systems (A = Li, Na)
Single-phase bulk samples of the "exotic" CoO2, the x = 0 phase of the AxCoO2
systems (A = Li, Na), were successfully synthesized through electrochemical
de-intercalation of Li from pristine LiCoO2 samples. The samples of pure CoO2
were found to be essentially oxygen stoichiometric and possess a hexagonal
structure consisting of stacked triangular-lattice CoO2 layers only. The
magnetism of CoO2 is featured with a temperature-independent susceptibility of
the magnitude of 10-3 emu/mol Oe, being essentially identical to that of a
Li-doped phase, Li0.12CoO2. It is most likely that the CoO2 phase is a
Pauli-paramagnetic metal with itinerant electrons.Comment: 12 pages, 3 figure
Field-induced commensurate long-range order in the Haldane-gap system NDMAZ
High-field neutron diffraction studies of the new quantum-disordered S=1
linear-chain antiferromagnet Ni(CHN)N(ClO) (NDMAZ)
are reported. At T=70 mK, at a critical field T applied along the
(013) direction, a phase transition to a commensurate N\'{e}el-like ordered
state is observed. The results are discussed in the context of existing
theories of quantum phase transitions in Haldane-gap antiferromagnets, and in
comparions with previous studies of the related system
Ni(CHN)N(PF)
Electrochemical synthesis and properties of CoO[sub 2], the x=0 phase of the A[sub x]CoO[sub 2] systems (A=Li,Na)
Single-phase bulk samples of the “exotic” CoO2, the x=0 phase of the AxCoO2 systems (A=Li,Na), were successfully synthesized through electrochemical deintercalation of Li from pristine LiCoO2 samples. The samples of pure CoO2 were found to be essentially oxygen stoichiometric and possess a hexagonal structure consisting of stacked triangular-lattice CoO2 layers only. The magnetism of CoO2 is featured with a temperature-independent susceptibility of the magnitude of 10−3emu/molOe, being essentially identical to that of a Li-doped phase, Li0.12CoO2. It is most likely that the CoO2 phase is a Pauli-paramagnetic metal with itinerant electrons.Peer reviewe
Electronic and Magnetic Properties of Febr2
Electronic and magnetic (e-m) properties of FeBr2 have been surprisingly well
described as originating from the Fe2+ ions and their fine electronic
structure. The fine electronic structure have been evaluated taking into
account the spin-orbit (s-o) coupling, crystal-field and inter-site
spin-dependent interactions. The required magnetic doublet ground state with an
excited singlet at D=2.8 meV results from the trigonal distortion. This effect
of the trigonal distortion and a large magnetic moment of iron, of 4.4 mB, can
be theoretically derived provided the s-o coupling is correctly taking into
account. The obtained good agreement with experimental data indicates on
extremaly strong correlations of the six 3d electrons in the Fe2+ ion yielding
their full localization and the insulating state. These calculations show that
for the meaningful analysis of e-m properties of FeBr2 the spin-orbit coupling
is essentially important and that the orbital moment (0.74 mB) is largely
unquenched (by the off-cubic trigonal distortion in the presence of the
spin-orbit coupling).Comment: 11 pages in RevTex, 5 figure
Eigenmode excitation of Alfven ion cyclotron instability
科研費報告書収録論文(課題番号:07558072・基盤研究(A)(2)・H7~H9/研究代表者:犬竹, 正明/高密度プラズマ源を用いた電磁流体工学試験装置の開発
Large-Scale Numerical Evidence for Bose Condensation in the S=1 Antiferromagnetic Chain in a Strong Field
Using the recently proposed density matrix renormalization group technique we
show that the magnons in the S=1 antiferromagnetic Heisenberg chain effectively
behaves as bosons that condense at a critical field h_c.Comment: 12 pages, REVTEX 3.0, 3 postscript figures appended, UBCTP-93-00
A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(As1-xPx)2
In a superconductor, the ratio of the carrier density, , to their
effective mass, , is a fundamental property directly reflecting the length
scale of the superfluid flow, the London penetration depth, . In two
dimensional systems, this ratio () determines the
effective Fermi temperature, . We report a sharp peak in the
-dependence of at zero temperature in clean samples of
BaFe(AsP) at the optimum composition , where the
superconducting transition temperature reaches a maximum of 30\,K. This
structure may arise from quantum fluctuations associated with a quantum
critical point (QCP). The ratio of at is enhanced,
implying a possible crossover towards the Bose-Einstein condensate limit driven
by quantum criticality.Comment: Main text (5 pages, 4 figures) + Supplementary Materials (5 pages, 5
figures). Published on June 22, 201
Anomalous superfluid density in quantum critical superconductors
When a second-order magnetic phase transition is tuned to zero temperature by
a non-thermal parameter, quantum fluctuations are critically enhanced, often
leading to the emergence of unconventional superconductivity. In these `quantum
critical' superconductors it has been widely reported that the normal-state
properties above the superconducting transition temperature often exhibit
anomalous non-Fermi liquid behaviors and enhanced electron correlations.
However, the effect of these strong critical fluctuations on the
superconducting condensate below is less well established. Here we report
measurements of the magnetic penetration depth in heavy-fermion, iron-pnictide,
and organic superconductors located close to antiferromagnetic quantum critical
points showing that the superfluid density in these nodal superconductors
universally exhibit, unlike the expected -linear dependence, an anomalous
3/2 power-law temperature dependence over a wide temperature range. We propose
that this non-integer power-law can be explained if a strong renormalization of
effective Fermi velocity due to quantum fluctuations occurs only for momenta
close to the nodes in the superconducting energy gap .
We suggest that such `nodal criticality' may have an impact on low-energy
properties of quantum critical superconductors.Comment: Main text (5 pages, 3 figures) + Supporting Information (3 pages, 4
figures). Published in PNAS Early Edition on February 12, 201
Evidence for superconducting gap nodes in the zone-centered hole bands of KFe2As2 from magnetic penetration-depth measurements
Among the iron-based pnictide superconductors the material KFeAs is
unusual in that its Fermi surface does not consist of quasi-nested electron and
hole pockets. Here we report measurements of the temperature dependent London
penetration depth of very clean crystals of this compound with residual
resistivity ratio . We show that the superfluid density at low
temperatures exhibits a strong linear-in-temperature dependence which implies
that there are line nodes in the energy gap on the large zone-centered hole
sheets. The results indicate that KFeAs is an unconventional
superconductor with strong electron correlations.Comment: 6 pages, 6 figures, 1 table. Extended version to be published in
Phys. Rev.
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