57 research outputs found
Emergence of inhomogeneous moments from spin liquid in the triangular-lattice Mott insulator -(ET)Cu(CN)
The static and dynamic local spin susceptibility of the organic Mott
insulator -(ET)Cu(CN), a model material of the spin- 1/2
triangular lattice, is studied by C NMR spectroscopy from room
temperature down to 20 mK. We observe an anomalous field-dependent spectral
broadening with the continuous and bipolar shift distribution, appearing
without the critical spin fluctuations. It is attributable to spatially
nonuniform magnetizations induced in the spin liquid under magnetic fields. The
amplitude of the magnetization levels off below 1 K, while the low-lying spin
fluctuations survive toward the ground state, as indicated by the temperature
profile of the relaxation rates.Comment: 4 pages, 4 figure
Theory of the beta-type Organic Superconductivity under Uniaxial Compression
We study theoretically the shift of the superconducting transition
temperature (Tc) under uniaxial compression in beta-type organic
superconductors, beta-(BEDT-TTF)2I3 and beta-(BDA-TTP)2X[X=SbF6,AsF6], in order
to clarify the electron correlation, the spin frustration and the effect of
dimerization. The transfer integrals are calculated by the extended Huckel
method assuming the uniaxial strain and the superconducting state mediated by
the spin fluctuation is solved using Eliashberg's equation with the
fluctuation-exchange approximation. The calculation is carried out on both the
dimerized (one-band) and nondimerized (two-band) Hubbard models. We have found
that (i) the behavior of Tc in beta-(BEDT-TTF)2I3 with a stronger dimerization
is well reproduced by the dimer model, while that in weakly dimerized
beta-BDA-TTP salts is rather well reproduced by the two-band model, and (ii)
the competition between the spin frustration and the effect induced by the
fluctuation is important in these materials, which causes nonmonotonic shift of
Tc against uniaxial compression.Comment: 18 pages, 16 figures, 2 tabl
Spin Liquid State in an Organic Mott Insulator with Triangular Lattice
H NMR and static susceptibility measurements have been performed in an
organic Mott insulator with nearly isotropic triangular lattice,
-(BEDT-TTF)Cu(CN), which is a model system of
frustrated quantum spins. The static susceptibility is described by the spin
= 1/2 antiferromagnetic triangular-lattice Heisenberg model with the
exchange constant 250 K. Regardless of the large magnetic
interactions, the H NMR spectra show no indication of long-range magnetic
ordering down to 32 mK, which is four-orders of magnitude smaller than .
These results suggest that a quantum spin liquid state is realized in the close
proximity of the superconducting state appearing under pressure.Comment: 4 pages, 4 figure
Effects of Next-Nearest-Neighbor Repulsion on One-Dimensional Quarter-Filled Electron Systems
We examine effects of the next-nearest-neighbor repulsion on electronic
states of a one-dimensional interacting electron system which consists of
quarter-filled band and interactions of on-site and nearest-neighbor repulsion.
We derive the effective Hamiltonian for the electrons around wave number \pm
\kf (\kf: Fermi wave number) and apply the renormalization group method to
the bosonized Hamiltonian. It is shown that the next-nearest-neighbor repulsion
makes 4\kf-charge ordering unstable and suppresses the spin fluctuation.
Further the excitation gaps and spin susceptibility are also evaluated.Comment: 19 pages, 8 figures, submitted to J. Phys. Soc. Jp
Multi-Orbital Molecular Compound (TTM-TTP)I_3: Effective Model and Fragment Decomposition
The electronic structure of the molecular compound (TTM-TTP)I_3, which
exhibits a peculiar intra-molecular charge ordering, has been studied using
multi-configuration ab initio calculations. First we derive an effective
Hubbard-type model based on the molecular orbitals (MOs) of TTM-TTP; we set up
a two-orbital Hamiltonian for the two MOs near the Fermi energy and determine
its full parameters: the transfer integrals, the Coulomb and exchange
interactions. The tight-binding band structure obtained from these transfer
integrals is consistent with the result of the direct band calculation based on
density functional theory. Then, by decomposing the frontier MOs into two
parts, i.e., fragments, we find that the stacked TTM-TTP molecules can be
described by a two-leg ladder model, while the inter-fragment Coulomb energies
are scaled to the inverse of their distances. This result indicates that the
fragment picture that we proposed earlier [M.-L. Bonnet et al.: J. Chem. Phys.
132 (2010) 214705] successfully describes the low-energy properties of this
compound.Comment: 5 pages, 4 figures, published versio
Magnetic Fluctuations in a Charge Ordered State of the One-Dimensional Extended Hubbard Model with a Half-Filled Band
Magnetic properties in a charge ordered state are examined for the extended
Hubbard model at half-filling. Magnetic excitations, magnetic susceptibilities
and a nuclear spin relaxation rate are calculated with taking account of
fluctuations around the mean-field solution. The relevance of the present
results to the observation in the 1:1 organic conductors, (TTM-TTP)I, is
discussed.Comment: 4 pages, 3 figures, to be published in J. Phys. Soc. Jpn. Vol.71
(2002) No.
de Haas-van Alphen Effect in the Two-Dimensional and the Quasi-Two-Dimensional Systems
We study the de Haas-van Alphen (dHvA) oscillation in two-dimensional and
quasi-two-dimensional systems. We give a general formula of the dHvA
oscillation in two-dimensional multi-band systems. By using this formula, the
dHvA oscillation and its temperature-dependence for the two-band system are
shown. By introducing the interlayer hopping , we examine the crossover
from the two-dimension, where the oscillation of the chemical potential plays
an important role in the magnetization oscillation, to the three-dimension,
where the oscillation of the chemical potential can be neglected as is well
know as the Lifshitz and Kosevich formula. The crossover is seen at , where a and b are lattice constants, is the flux
quantum and 8t is the width of the total energy band. We also study the dHvA
oscillation in quasi-two-dimensional magnetic breakdown systems. The quantum
interference oscillations such as oscillation as well as the
fundamental oscillations are suppressed by the interlayer hopping , while
the oscillation gradually increases as increases and it
has a maximum at . This interesting dependence on the
dimensionality can be observed in the quasi-two-dimensional organic conductors
with uniaxial pressure.Comment: 11 pages, 14 figure
Evidence for structural and electronic instabilities at intermediate temperatures in -(BEDT-TTF)X for X=Cu[N(CN)]Cl, Cu[N(CN)]Br and Cu(NCS): Implications for the phase diagram of these quasi-2D organic superconductors
We present high-resolution measurements of the coefficient of thermal
expansion of the quasi-twodimensional
(quasi-2D) salts -(BEDT-TTF)X with X = Cu(NCS), Cu[N(CN)]Br
and Cu[N(CN)]Cl. At intermediate temperatures (B), distinct anomalies
reminiscent of second-order phase transitions have been found at
K and 45 K for the superconducting X = Cu(NCS) and Cu[N(CN)]Br salts,
respectively. Most interestingly, we find that the signs of the uniaxial
pressure coefficients of are strictly anticorrelated with those of
. We propose that marks the transition to a spin-density-wave
(SDW) state forming on minor, quasi-1D parts of the Fermi surface. Our results
are compatible with two competing order parameters that form on disjunct
portions of the Fermi surface. At elevated temperatures (C), all compounds show
anomalies that can be identified with a kinetic, glass-like
transition where, below a characteristic temperature , disorder in the
orientational degrees of freedom of the terminal ethylene groups becomes frozen
in. We argue that the degree of disorder increases on going from the X =
Cu(NCS) to Cu[N(CN)]Br and the Cu[N(CN)]Cl salt. Our results
provide a natural explanation for the unusual time- and cooling-rate
dependencies of the ground-state properties in the hydrogenated and deuterated
Cu[N(CN)]Br salts reported in the literature.Comment: 22 pages, 7 figure
Pressure-Induced Zero-Gap Semiconducting State in Organic Conductor -(BEDT-TTF)I Salt
We show a zero-gap semiconducting (ZGS) state in the quasi-two-dimensional
organic conductor -(BEDT-TTF)I salt, which emerges under
uniaxial pressure along the a-axis (the stacking axis of the BEDT-TTF
molecule). The ZGS state is the state in which a Dirac cone with the band
spectrum of a linear dispersion exists around the Fermi point connecting an
unoccupied (electron) band with an occupied (hole) band. The spectrum exhibits
a large anisotropy in velocity, which depends on the direction from the Fermi
point. By varying the magnitude of several transfer energies of a tight-binding
model with four sites per unit cell, it is shown that the ZGS state exists in a
wide pressure range, and is attributable to the large anisotropy of the
transfer energies along the stacking axis.Comment: 6 pages, 8 figures, to be published in J. Phys. Soc. Jp
Spin-liquid behavior and superconductivity in -(BEDT-TTF)X: The role of uniaxial strain
We have examined the relationship between the anisotropy
of the triangular lattice and the electronic states of -(BEDT-TTF)X. We have found the spin-liquid behavior in a Mott
insulator -(BEDT-TTF)Cu(CN) which has nearly
regular triangular lattice. The H-NMR study confirmed that this
compound shows no magnetic ordering down to 32mK, indicating the significant
role of the large spin frustration. The uniaxial compressive strain along
the - or -axes induced superconductivity in close proximity to the
spin-liquid phase. Further, its transition temperature was increased
under the strains. The enhancement of has been interpreted by the
effect of the reduction of spin frustration by the strains. The of
-(BEDT-TTF)X and its response to the uniaxial strain have
been discussed in terms of the anisotropy of the triangular lattice and
electron correlation.
Key words. Spin-liquid, Superconductivity, Mott insurator, Uniaxial
strain
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