93 citations · 280 across the 10 of their papers we have counts for
10 papers
Neutron diffraction study and theoretical analysis of the antiferromagnetic order and diffuse scattering in the layered Kagome system CaBaCoFeO
Johannes D. Reim, Erik Rosén, Oksana Zaharko +4
The hexagonal swedenborgite, CaBaCoFeO, is a chiral frustrated antiferromagnet, in which magnetic ions form alternating Kagome and triangular layers. We observe a long…
Suppression of Pauling's Residual Entropy in Dilute Spin Ice (DyY)TiO
S. Scharffe, O. Breunig, V. Cho +4
Around 0.5 K, the entropy of the spin-ice DyTiO has a plateau-like feature close to Pauling's residual entropy derived originally for water ice, but an unambiguous quan…
Hysteresis and Relaxation Effects in the Spin-Ice Compound DyTiO studied by Heat Transport
Simon Scharffe, Gerhard Kolland, Martin Hiertz +2
The low-temperature thermal conductivity of the spin-ice compound DyTiO shows pronounced hysteresis as a function of magnetic field. Here, we investigate how these…
Critical speeding-up near the monopole liquid-gas transition in magnetoelectric spin-ice
Christoph P. Grams, Martin Valldor, Markus Garst +1
Competing interactions in the so-called spin-ice compounds stabilize a frustrated ground-state with finite zero-point entropy and, interestingly, emergent magnetic monopole excitat…
Anisotropic Monopole Heat Transport in the Spin-Ice Compound DyTiO
G. Kolland, M. Valldor, M. Hiertz +2
We report a study of the thermal conductivity of the spin-ice material DyTiO. From the anisotropic magnetic-field dependence of κ$ and by additional measurements on…
Spin correlations in the extended kagome system YBaCo3FeO7
Martin Valldor, Raphaël P. Hermann, Joachim Wuttke +2
The transition metal based oxide YBaCo3FeO7 is structurally related to the mineral Swedenborgite SbNaBe4O7, a polar non-centrosymmetric crystal system. The magnetic Co3Fe sublattic…
Antiferromagnetic Heisenberg S=5/2 spin chain compound SrMnVO
Sandra K. Niesen, Oliver Heyer, Thomas Lorenz +1
Large single crystals of the new compound SrMnVO have been grown by the floating-zone method. This transition-metal based oxide is isostructural to SrNiVO,…
Magnetostrictive Neel ordering of the spin-5/2 ladder compound BaMn2O3: distortion-induced lifting of geometrical frustration
M. Valldor, O. Heyer, A. C. Komarek +3
The crystal structure and the magnetism of BaMnO have been studied by thermodynamic and by diffraction techniques using large single crystals and powders. BaMnO is…
Approaching the ground state of the kagome antiferromagnet
W. Schweika, M. Valldor, P. Lemmens
Y{0.5}$Ca{0.5}BaCo4O7 contains kagome layers of Co ions, whose spins are strongly coupled according to a Curie-Weiss temperature of -2200 K. At low temperatures, T = 1.2 K, our dif…
Remnant magnetization above room temperature in semiconducting Y_0.5Ca_0.5BaCo_4O_7
Martin Valldor
The Y_0.5Ca_0.5BaCo_4O_7 compound exhibits four magnetic anomalies at the temperatures 387, 281, 52, and 14 K; all anomalies show characteristics typical for spin freezing into dis…