Max Planck Society

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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

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Showing 2005 · cond-mat.str-elShow all

20 papers · 2 filters

cond-mat.str-el2005★ 42 cited

Quasiquartet CEF ground state with possible quadrupolar ordering in the tetragonal compound YbRu $_{2}$ Ge $_{2}$

H. S. Jeevan, Z. Hossain, C. Geibel

e have investigated the magnetic properties of YbRu $_{2}$ Ge $_{2}$ by means of magnetic susceptibility $χ$ (T), specific heat C(T) and electrical resistivity $ρ$ (T) measurements perf…

cond-mat.str-el2005★ 10 cited

Bose-Einstein condensation vs. localization of bosonic quasiparticles in disordered weakly-coupled dimer antiferromagnets

Tommaso Roscilde, Stephan Haas

We investigate the field-induced insulator-to-superfluid transition of bosonic quasiparticles in $S = 1/2$ weakly-coupled dimer antiferromagnets. In presence of realistic disorder du…

cond-mat.str-el2005★ 22 cited

Low Temperature Thermodynamic Properties of the Heavy Fermion Compound YbAgGe Close to the Field-Induced Quantum Critical Point

Y. Tokiwa, A. Pikul, P. Gegenwart +3

We present temperature and field dependent heat capacity and magnetization data taken at temperatures down to 50 mK and in an applied magnetic field up to 11.5 Tesla for YbAgGe, a…

cond-mat.str-el2005★ 2 cited

Electronic Structure Calculations using Dynamical Mean Field Theory

K. Held

The calculation of electronic properties of materials is an important task of solid state theory, albeit particularly difficult if electronic correlations are strong, for example i…

cond-mat.str-el2005★ 26 cited

Kondo physics in transport through a quantum dot with Luttinger liquid leads

S. Andergassen, T. Enss, V. Meden

We study the gate voltage dependence of the linear conductance through a quantum dot coupled to one-dimensional leads. For interacting dot electrons but noninteracting leads Kondo…

cond-mat.str-el2005★ 35 cited

Critical exponents and the correlation length in the charge exchange manganite spin glass Eu_{0.5}Ba_{0.5}MnO_{3}

Sunil Nair, A. K. Nigam

The critical regime of the charge exchange (CE) manganite spin glass Eu_{0.5}Ba_{0.5}MnO_{3} is investigated using linear and non linear magnetic susceptibility and the divergence…

cond-mat.str-el2005★ 49 cited

Charge order and spin-singlet pairs formation in Ti4O7

I. Leonov, A. N. Yaresko, V. N. Antonov +3

Charge ordering in the low-temperature triclinic structure of titanium oxide (Ti4O7) is investigated using the local density approximation (LDA)+U method. Although the total 3d cha…

cond-mat.str-el2005★ 4 cited

Phase diagram of the excitonic insulator

B. Hülsen, F. X. Bronold, H. Fehske +1

Motivated by recent experiments, which give strong evidence for an excitonic insulating phase in $TmS e_{0.45} T e_{0.55}$ , we developed a scheme to quantitatively construct, for…

cond-mat.str-el2005★ 4 cited

Interplay among Spin, Orbital and Lattice Degrees of Freedom in $t_{2 g}$ Electron Systems with Edge-Sharing Network of Octahedra

Yukitoshi Motome, Hirokazu Tsunetsugu, Toshiya Hikihara +2

Transition metal oxides whose lattice structure has edge-sharing network of octahedra constitute a diverse group of intriguing materials besides compounds with corner-sharing octah…

cond-mat.str-el2005★ 7 cited

Anisotropy, disorder, and superconductivity in CeCu2Si2 under high pressure

A. T. Holmes, D. Jaccard, H. S. Jeevan +2

Resistivity measurements were carried out up to 8 GPa on single crystal and polycrystalline samples of CeCu2Si2 from differing sources in the homogeneity range. The anisotropic res…

cond-mat.str-el2005★ 17 cited

Transport properties of moderately disordered UCu $_{4}$ Pd

A. Otop, S. Süllow, M. B. Maple +4

We present a detailed study on the (magneto)transport properties of as-cast and heat treated material UCu $_{4}$ Pd. We find a pronounced sample dependence of the resistivity $ρ$ of as…

cond-mat.str-el2005★ 18 cited

Crystallographic disorder and electron scattering on structural two-level systems in ZrAs1.4Se0.5

M. Schmidt, T. Cichorek, R. Niewa +4

Single crystals of ZrAs1.4Se0.5 (PbFCl type structure) were grown by chemical vapour transport. While their thermodynamic and transport properties are typical for ordinary metals,…

cond-mat.str-el2005★ 4 cited

Cluster approach study of intersite electron correlations in pyrochlore and checkerboard lattices

V. Yushankhai, P. Fulde, P. Thalmeier

To treat effects of electron correlations in geometrically frustrated pyrochlore and checkerboard lattices, an extended single-orbital Hubbard model with nearest neighbor hopping $…

cond-mat.str-el2005★ 21 cited

Resistivity and optical conductivity of cuprates within the t-J model

M. M. Zemljic, P. Prelovsek

The optical conductivity $σ (ω)$ and the d.c. resistivity $ρ (T)$ within the extended t-J model on a square lattice, as relevant to high- $T_{c}$ cuprates, are reinvestigated using the…

cond-mat.str-el2005★ 57 cited

Field-induced suppression of the heavy-fermion state in YbRh_2Si_2

Y. Tokiwa, P. Gegenwart, T. Radu +4

We report DC magnetization measurements on YbRh_2Si_2 at temperatures down to 0.04K, magnetic fields B<11.5T and under hydrostatic pressure P<1.3GPa. At ambient pressure a kink at…

cond-mat.str-el2005★ 36 cited

The One-Particle Spectral Function and the Local Density of States in a Phenomenological Mixed-Phase Model for High-Temperature Superconductors

M. Mayr, A. Gonzalez, A. Moreo +1

The dynamical properties of a recently introduced phenomenological model for high temperature superconductors are investigated. In the clean limit, it was observed that none of the…

cond-mat.str-el2005★ 28 cited

Charge order in Fe2OBO3: An LSDA+U study

I. Leonov, A. N. Yaresko, V. N. Antonov +2

Charge ordering in the low-temperature monoclinic structure of iron oxoborate (Fe2OBO3) is investigated using the local spin density approximation (LSDA)+U method. While the differ…

cond-mat.str-el2005★ 11 cited

Bosonic resonating valence bond wave function for doped Mott insulators

Z. Y. Weng, Y. Zhou, V. N. Muthukumar

We propose a new class of ground states for doped Mott insulators in the electron second-quantization representation. They are obtained from a bosonic resonating valence bond (RVB)…

cond-mat.str-el2005★ 21 cited

Unusual magnetic properties of the low-dimensional quantum magnet Na2V3O7

J. L. Gavilano, E. Felder, D. Rau +5

We report the results of low-temperature measurements of the specific heat Cp(T), ac susceptibility chi(T) and 23Na nuclear magnetic resonance NMR of Na2V3O7. At liquid He temperat…

cond-mat.str-el2005★ 5 cited

Charge ordering in the spinels AlV $_{2}$ O $_{4}$ and LiV $_{2}$ O $_{4}$

Y. Z. Zhang, P. Fulde, P. Thalmeier +1

We develop a microscopic theory for the charge ordering (CO) transitions in the spinels AlV $_{2}$ O $_{4}$ and LiV $_{2}$ O $_{4}$ (under pressure). The high degeneracy of CO states is lifted b…

Quasiquartet CEF ground state with possible quadrupolar ordering in the tetragonal compound YbRu2​Ge2​

Bose-Einstein condensation vs. localization of bosonic quasiparticles in disordered weakly-coupled dimer antiferromagnets

Low Temperature Thermodynamic Properties of the Heavy Fermion Compound YbAgGe Close to the Field-Induced Quantum Critical Point

Electronic Structure Calculations using Dynamical Mean Field Theory

Kondo physics in transport through a quantum dot with Luttinger liquid leads

Critical exponents and the correlation length in the charge exchange manganite spin glass Eu_{0.5}Ba_{0.5}MnO_{3}

Charge order and spin-singlet pairs formation in Ti4O7

Phase diagram of the excitonic insulator

Interplay among Spin, Orbital and Lattice Degrees of Freedom in t2g​ Electron Systems with Edge-Sharing Network of Octahedra

Anisotropy, disorder, and superconductivity in CeCu2Si2 under high pressure

Transport properties of moderately disordered UCu4​Pd

Crystallographic disorder and electron scattering on structural two-level systems in ZrAs1.4Se0.5

Cluster approach study of intersite electron correlations in pyrochlore and checkerboard lattices

Resistivity and optical conductivity of cuprates within the t-J model

Field-induced suppression of the heavy-fermion state in YbRh_2Si_2

The One-Particle Spectral Function and the Local Density of States in a Phenomenological Mixed-Phase Model for High-Temperature Superconductors

Charge order in Fe2OBO3: An LSDA+U study

Bosonic resonating valence bond wave function for doped Mott insulators

Unusual magnetic properties of the low-dimensional quantum magnet Na2V3O7

Charge ordering in the spinels AlV2​O4​ and LiV2​O4​

Quasiquartet CEF ground state with possible quadrupolar ordering in the tetragonal compound YbRu $_{2}$ Ge $_{2}$

Interplay among Spin, Orbital and Lattice Degrees of Freedom in $t_{2 g}$ Electron Systems with Edge-Sharing Network of Octahedra

Transport properties of moderately disordered UCu $_{4}$ Pd

Charge ordering in the spinels AlV $_{2}$ O $_{4}$ and LiV $_{2}$ O $_{4}$