Zaharko, O., Cervellino, A., Tsurkan, V., Christensen, N. B., Loidl, A.
Using neutron powder diffraction and Monte-Carlo simulations we show that a spin-liquid regime emerges at all compositions in the diamond-lattice antiferromagnets Co(Al1-xCox)2O4. This spin-liquid...
Kant, Ch., Deisenhofer, J., Rudolf, T., Mayr, F., Schrettle, F., Loidl, A., ...
We report on infrared, Raman, magnetic susceptibility, and specific heat measurements on CdCr2O4 and ZnCr2O4 single crystals. We estimate the nearest-neighbor and next-nearest neighbor exchange...
Magnetic susceptibility of the frustrated spinels ZnCr2O4, MgCr2O4 and CdCr2O4 (2009)
Kant, Ch., Deisenhofer, J., Tsurkan, V., Loidl, A.
We analyzed the magnetic susceptibilities of several Cr spinels using two recent models for the geometrically frustrated pyrochlore lattice, the Quantum Tetrahedral Mean Field model and a Generalized...
Yokaichiya, F., Krimmel, A., Tsurkan, V., Margiolaki, I., Thompson, P., Bordallo, H. N., ...
The crystal and magnetic structures of the spinel compounds ZnCr$_2$S$_4$ and ZnCr$_2$Se$_4$ were investigated by high resolution powder synchrotron and neutron diffraction. ZnCr$_2$Se$_4$ exhibits a...
Colossal magnetocapacitive effect in differently synthesized and doped CdCr2S4 (2008)
Krohns, S., Schrettle, F., Lunkenheimer, P., Tsurkan, V., Loidl, A.
In the present work, we address the question of an impurity-related origin of the colossal magnetocapacitive effect in the spinel system CdCr2S4. We demonstrate that a strong variation in the...
Optical properties of ZnCr2Se4 - Spin-phonon coupling and electronic d-d-like excitations (2008)
Rudolf, T., Kant, Ch., Mayr, F., Schmidt, M., Tsurkan, V., Deisenhofer, J., ...
We studied the optical properties of antiferromagnetic ZnCr2Se4 by infrared spectroscopy up to 28,000 cm-1 and for temperatures from 5 to 295 K. At the magnetic phase transition at 21 K, one of the...
Glazkov, V. N., Farutin, A. M., Tsurkan, V., Loidl, A.
We present an elaborate electron-spin resonance study of the low-energy dynamics and magnetization in the ordered phase of the magnetically frustrated spinel ZnCr$_2$O$_4$. We observe several...
Spin Frustration and Magnetic Exchange in Cobalt Aluminum Oxide Spinels (2007)
Tristan, N., Zestrea, V., Behr, G., Klingeler, R., Buechner, B., ...
We report on x-ray diffraction, magnetic susceptibility, electron- spin resonance and heat- capacity studies of Co[Al_1-xCo_x]_2O_4 for Co concentrations 0
Polar phonons and spin-phonon coupling in HgCr2S4 and CdCr2S4 (2007)
Rudolf, T., Kant, Ch., Mayr, F., Hemberger, J., Tsurkan, V., Loidl, A.
Polar phonons of HgCr2S4 and CdCr2S4 are studied by far-infrared spectroscopy as a function of temperature and external magnetic field. Eigenfrequencies, damping constants, effective plasma...
Evidence for local lattice distortions in giant magnetocapacitive CdCr2S4 (2007)
Gnezdilov, V., Lemmens, P., Pashkevich, Yu. G., Scheib, P., Payen, Ch., Choi, K. Y., ...
Raman scattering experiments on CdCr2S4 single crystals show pronounced anomalies in intensity and frequency of optical phonon modes with an onset temperature T*=130 K that coincides with the regime...
Lunkenheimer, P., Hemberger, J., Tsurkan, V., Staresinic, D., Biljakovic, K., Loidl, A.
In the present work we reply to the Comment by Catalan and Scott (cond-mat/0607500) on two of our papers. This Comment has been rejected from publication in Physical Review Letters and, hence, our...
Spin-phonon coupling in antiferromagnetic chromium spinels (2007)
Rudolf, T., Kant, Ch., Mayr, F., Hemberger, J., Tsurkan, V., Loidl, A.
The temperature dependence of eigenfrequencies and intensities of the IR active modes has been investigated for the antiferromagnetic chromium spinel compounds CdCr2O4, ZnCr2O4, ZnCr2S4, ZnCr2Se4,...
T Rudolf, Ch Kant, F Mayr, J Hemberger, V Tsurkan, A Loidl
open–access journal for physics Spin-phonon coupling in antiferromagnetic chromium spinels
Spin-phonon coupling in ZnCr2Se4 (2006)
Rudolf, T., Kant, Ch., Mayr, F., Hemberger, J., Tsurkan, V., Loidl, A.
Spin-phonon coupling and magnetodielectric effects of ZnCr2Se4 were investigated by means of infrared (IR) spectroscopy as a function of temperature and magnetic field. ZnCr2Se4 is dominated by...
Multiferroicity and colossal magneto-capacitance in Cr-thiospinels (2006)
Hemberger, J., Lunkenheimer, P., Fichtl, R., Weber, S., Tsurkan, V., Loidl, A.
The sulfur based Cr-spinels RCr2S4 with R = Cd and Hg exhibit the coexistence of ferromagnetic and ferroelectric properties together with a pronounced magnetocapacitive coupling. While in CdCr2S4...
Hemberger, J., Tsurkan, V., Loidl, A.
A detailed investigation of ZnCr2Se4 is presented which is dominated by strong ferromagnetic exchange but orders antiferromagnetically at T_N = 21 K. Specific heat C and thermal expansion Delta L/L...
Spin-driven Phonon Splitting in Bond-frustrated ZnCr2S4 (2006)
Hemberger, J., Rudolf, T., Mayr, F., Pimenov, A., Tsurkan, V., ...
Utilizing magnetic susceptibility, specific heat, thermal expansion and IR spectroscopy we provide experimental evidence that the two subsequent antiferromagnetic transitions in ZnCr_2S_4 at T_N1 =...
Tsurkan, V., Hemberger, J., Krimmel, A., Lunkenheimer, P., Weber, S., ...
A detailed study of poly- and single crystalline samples of the normal spinel HgCr2S4 is reported. The structural refinement reveals enhanced values of the atomic displacements suggesting closeness...
Colossal magnetocapacitance and colossal magnetoresistance in HgCr2S4 (2006)
Weber, S., Lunkenheimer, P., Fichtl, R., Hemberger, J., Tsurkan, V., Loidl, A.
We present a detailed study of the dielectric and charge transport properties of the antiferromagnetic cubic spinel HgCr2S4. Similar to the findings in ferromagnetic CdCr2S4, the dielectric constant...
Multiferroic behavior in CdCr2X4 (X = S, Se) (2005)
Hemberger, J., Lunkenheimer, P., Fichtl, R., Weber, S., Tsurkan, V., Loidl, A.
The recently discovered multiferroic material CdCr2S4 shows a coexistence of ferromagnetism and relaxor ferroelectricity together with a colossal magnetocapacitive effect. The complex dielectric...
Mueller, C., Zestrea, V., Tsurkan, V., Horn, S., Tidecks, R., Wixforth, A.
Using surface acoustic waves, the elastomagnetic coupling could be studied in thin single crystalline plates of the ferrimagnetic semiconductor FeCr2S4 by measuring the attenuation and the frequency...
Phonon anomalies and charge dynamics in Fe_{1-x}Cu_{x}Cr_{2}S_{4} single crystals (2005)
Rudolf, T., Pucher, K., Mayr, F., Samusi, D., Tsurkan, V., Tidecks, R., ...
A detailed investigation of phonon excitations and charge carrier dynamics in single crystals of Fe_{1-x}Cu_{x}Cr_{2}S_{4} (x = 0, 0.2, 0.4, 0.5) has been performed by using infrared spectroscopy. In...
Relaxation dynamics and colossal magnetocapacitive effect in CdCr2S4 (2005)
Lunkenheimer, P., Fichtl, R., Hemberger, J., Tsurkan, V., Loidl, A.
A thorough investigation of the relaxational dynamics in the recently discovered multiferroic CdCr2S4 showing a colossal magnetocapacitive effect has been performed. Broadband dielectric measurements...
Glassy freezing of orbital dynamics in FeCr2S4 and FeSc2S4 (2005)
Fichtl, R., Lunkenheimer, P., Hemberger, J., Tsurkan, V., Loidl, A.
We report on a thorough dielectric investigation of the glass-like freezing of the orbital reorientation-dynamics, recently found for the crystalline sulpho-spinels FeCr2S4 and FeSc2S4. As the...
Relaxor ferroelectricity and colossal magnetocapacitive coupling in ferromagnetic CdCr2S4 (2005)
Hemberger, J., Lunkenheimer, P., Fichtl, R., Tsurkan, V., Loidl, A.
Multiferroic materials, which reveal magnetic and electric order, are in the focus of recent solid state research. Especially the simultaneous occurrence of ferroelectricity and ferromagnetism,...
Orbital Glass in FeCr2S4 (2004)
Tsurkan, V., Fritsch, V., Hemberger, J., Krimmel, A., Muecksch, M., Buettgen, N., ...
Low-temperature heat-capacity investigations on the spinel FeCr2S4 with ferrimagnetic spin order and orbitally degenerated Jahn-Teller active Fe2+ ions in a tetrahedral crystal field, provide...
Low-temperature structural transition in FeCr_2S_4 (2004)
Mertinat, M., Tsurkan, V., Samusi, D., Tidecks, R., Haider, F.
Transmission electron microscopy studies of [110] and [111] oriented FeCr_2S_4 single crystals at different temperatures reveal a structural transition at low temperatures indicating a...
Orbital Freezing in FeCr2S4 Studied by Dielectric Spectroscopy (2004)
Fichtl, R., Lunkenheimer, P., Hemberger, J., Tsurkan, V., Loidl, A.
Broadband dielectric spectroscopy has been performed on single-crystalline FeCr2S4 revealing a transition into a low-temperature orbital glass phase and on polycrystalline FeCr2S4 where long-range...
Spin and orbital frustration in MnSc_2S_4 and FeSc_2S_4 (2004)
Fritsch, V., Hemberger, J., Buettgen, N., Scheidt, E. W., Loidl, A., ...
Crystal structure, magnetic susceptibility, and specific heat were measured in the normal cubic spinel compounds MnSc_2S_4 and FeSc_2S_4. Down to the lowest temperatures, both compounds remain cubic...
Anisotropic Colossal Magnetoresistance Effects in Fe_{1-x}Cu_xCr_2S_4 (2002)
Fritsch, V., Deisenhofer, J., Fichtl, R., Hemberger, J., Muecksch, M., ...
A detailed study of the electronic transport and magnetic properties of Fe$_{1-x}$Cu$_x$Cr$_2$S$_4$ ($x \leq 0.5$) on single crystals is presented. The resistivity is investigated for $2 \leq T \leq...
Magnetization Anomalies in some Ternary Spinel Single Crystals (1997)
Tsurkan, V., Radautsan, S., Baran, M., Szymczak, R., Szymczak, H.
DC magnetization studies of the Cu1+vCr2Se4-xBrx and Hg1-xCuxCr2Se4 magnetic spinel single crystals for different substitutions that induce bond and site disorder, revealed the reentrant...
Magnetization Anomalies in some Ternary Spinel Single Crystals (1997)
Tsurkan, V., Radautsan, S., Baran, M., Szymczak, R., Szymczak, H.
DC magnetization studies of the Cu1+vCr2Se4-xBrx and Hg1-xCuxCr2Se4 magnetic spinel single crystals for different substitutions that induce bond and site disorder, revealed the reentrant...
Magnetization Anomalies in some Ternary Spinel Single Crystals (1997)
Tsurkan, V., Radautsan, S., Baran, M., Szymczak, R., Szymczak, H.
DC magnetization studies of the Cu1+vCr2Se4-xBrx and Hg1-xCuxCr2Se4 magnetic spinel single crystals for different substitutions that induce bond and site disorder, revealed the reentrant...