290 research outputs found
Static Holes in the Geometrically Frustrated Bow Tie Ladder
We investigate the doping of a geometrically frustrated spin ladder with
static holes by a complementary approach using exact diagonalization and
quantum dimers. Results for thermodynamic properties, the singlet density of
states, the hole-binding energy and the spin correlations will be presented.
For the undoped systems the ground state is non-degenerate, with
translationally invariant nearest-neighbor spin correlations. In the doped
case, we find that static holes polarize their vicinity by a localization of
singlets in order to reduce the frustration. This polarization induces short
range repulsive forces between two holes and an oscillatory behavior of the
long range two-hole energy. For most quantities investigated, we find very good
agreement between the quantum dimer approach and the results from exact
diagonalization.Comment: 7 pages, 9 eps figure
Quantum phases of a frustrated four-leg spin tube
We study the ground state phase diagram of a frustrated spin-1/2 four-leg tube. Using a variety of complementary techniques, namely density matrix renormalization group, exact diagonalization, Schwinger boson mean field theory, quantum Monte-Carlo and series expansion, we explore the parameter space of this model in the regime of all-antiferromagnetic exchange. In contrast to unfrustrated four-leg tubes we uncover a rich phase diagram. Apart from the Luttinger liquid fixed point in the limit of decoupled legs, this comprises several gapped ground states, namely a plaquette, an incommensurate, and an antiferromagnetic quasi spin-2 chain phase. The transitions between these phases are analyzed in terms of total energy and static structure factor calculations and are found to be of (weak) first order. Despite the absence of long range order in the quantum case, remarkable similarities to the classical phase diagram are uncovered, with the exception of the icommensurate regime, which is strongly renormalized by quantum fluctuations. In the limit of large leg exchange the tube exhibits a deconfinement cross-over from gapped magnon like excitations to spinons.Fil: Arlego, Marcelo José Fabián. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de FÃsica; Argentina. Consejo Nacional de Investigaciones CientÃficas y Técnicas; ArgentinaFil: Brenig, W.. Technische Universität Braunschweig; AlemaniaFil: Rahnavard, Y.. Technische Universität Braunschweig; AlemaniaFil: Willenberg, B.. Technische Universität Braunschweig; AlemaniaFil: Rosales, Héctor Diego. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de FÃsica; Argentina. Consejo Nacional de Investigaciones CientÃficas y Técnicas; ArgentinaFil: Rossini, Gerardo Luis. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de FÃsica; Argentina. Consejo Nacional de Investigaciones CientÃficas y Técnicas; Argentin
Magnon Heat Transport in doped
We present results of the thermal conductivity of and single-crystals which represent model systems for the
two-dimensional spin-1/2 Heisenberg antiferromagnet on a square lattice. We
find large anisotropies of the thermal conductivity, which are explained in
terms of two-dimensional heat conduction by magnons within the CuO planes.
Non-magnetic Zn substituted for Cu gradually suppresses this magnon thermal
conductivity . A semiclassical analysis of
is shown to yield a magnon mean free path which scales
linearly with the reciprocal concentration of Zn-ions.Comment: 4 pages, 3 figure
Magnetic heat conductivity in : linear temperature dependence
We present experimental results for the thermal conductivity of the
pseudo 2-leg ladder material . The strong buckling of the ladder
rungs renders this material a good approximation to a Heisenberg-chain.
Despite a strong suppression of the thermal conductivity of this material in
all crystal directions due to inherent disorder, we find a dominant magnetic
contribution along the chain direction.
is \textit{linear} in temperature, resembling the
low-temperature limit of the thermal Drude weight of the
Heisenberg chain. The comparison of and
yields a magnetic mean free path of \AA, in good agreement with magnetic measurements.Comment: appears in PR
Phase transitions in two-dimensional anisotropic quantum magnets
We consider quantum Heisenberg ferro- and antiferromagnets on the square
lattice with exchange anisotropy of easy-plane or easy-axis type. The
thermodynamics and the critical behaviour of the models are studied by the
pure-quantum self-consistent harmonic approximation, in order to evaluate the
spin and anisotropy dependence of the critical temperatures. Results for
thermodynamic quantities are reported and comparison with experimental and
numerical simulation data is made. The obtained results allow us to draw a
general picture of the subject and, in particular, to estimate the value of the
critical temperature for any model belonging to the considered class.Comment: To be published on Eur. Phys. J.
Giant spin canting in the S = 1/2 antiferromagnetic chain [CuPM(NO3)2(H2O)2]n observed by 13C-NMR
We present a combined experimental and theoretical study on copper pyrimidine
dinitrate [CuPM(NO3)2(H2O)2]n, a one-dimensional S = 1/2 antiferromagnet with
alternating local symmetry. From the local susceptibility measured by NMR at
the three inequivalent carbon sites in the pyrimidine molecule we deduce a
giant spin canting, i.e., an additional staggered magnetization perpendicular
to the applied external field at low temperatures. The magnitude of the
transverse magnetization, the spin canting of 52 degrees at 10 K and 9.3 T and
its temperature dependence are in excellent agreement with exact
diagonalization calculations.Comment: 5 pages, 6 Postscript figure
On the valence-bond solid phase of the crossed-chain quantum spin model
Using a series expansion based on the flow-equation method we study the
ground state energy and the elementary triplet excitations of a generalized
model of crossed spin-1/2 chains starting from the limit of decoupled
quadrumers. The triplet dispersion is shown to be very sensitive to the
inter-quadrumer frustration, exhibiting a line of almost complete localization
as well as lines of quantum phase transitions limiting the stability of the
valence-bond solid phase. In the vicinity of the checkerboard-point a finite
window of exchange couplings is found with a non-zero spin-gap, consistent with
known results from exact diagonalization. The ground state energy is lower than
that of the bare quadrumer case for all exchange couplings investigated. In the
limiting situation of the fully frustrated checkerboard magnet our results
agree with earlier series expansion studies.Comment: 8 pages, 7 figure
Erfahrungen bei der Messung der Ergebnisqualität in der interventionellen Schmerztherapie
BACKGROUND There is a growing interest in patient-related outcome measurement. In this field questionnaires on touch screens are becoming more common. This study was designed to identify problems in usability and feasibility of a web-based questionnaire. STUDY PARTICIPANTS AND METHODS Patients who underwent a lumbar infiltration were recruited in 5 centers and 50 patients participated of which half were older than 62 years. One third of the patients had basically no former experience with computers or touch screens. The outcome was assessed before treatment and during follow-up on a simple web-based patient questionnaire, the Activity Index. Results were presented graphically and discussed during consultation. Patients, nurses and doctors were asked for standardized feedback. RESULTS Of the patients 84% completed the questionnaire in up to 6 min. An adapted form of the system usability scale (SUS) achieved an acceptance score of 71.8%. Problems in handling occurred mostly in older patients (>65 years). The system was scored with 72.9% and 78.5% in efficiency and handling, respectively, by the nurses. The attending physicians rated the usefulness and comprehensibility of the graphical representation of the results on average as 83.3% and both were scored neutral to positive; however, an average of 11.6% rated some aspects of the report to be suboptimal. CONCLUSION This web-based questionnaire is the first of its kind to be evaluated in everyday practice of interventional pain therapy for lumbar back pain. The vast majority of the patients were able to efficiently complete the questionnaire. The questionnaire was highly acceptable to patients, nurses and doctors. We found some usability problems but mainly in the older age group
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