Glassy Dynamics Under Superhigh Pressure (2009)
Pronin, A. A., Kondrin, M. V., Lyapin, A. G., Brazhkin, V. V., Volkov, A. A., Lunkenheimer, P., ...
Nearly all glass-forming liquids feature, along with the structural alpha-relaxation process, a faster secondary process (beta-relaxation), whose nature belongs to the great mysteries of glass...
On the room temperature multiferroic BiFeO3: Magnetic, dielectric and thermal properties (2009)
Lu, Jun, Günther, A., Schrettle, F., Mayr, F., Krohns, S., Lunkenheimer, P., ...
Magnetic dc susceptibility between 1.5 and 800 K, ac susceptibility and magnetization, thermodynamic properties, temperature dependence of radio and audio-wave dielectric constants and conductivity,...
Kant, Ch., Deisenhofer, J., Günther, A., Schrettle, F., Rotter, M., Johrendt, D., ...
We report on specific heat measurements in Ba$_{1-x}$K$_x$Fe$_{2}$As$_{2}$ ($x\le 0.6$). For the underdoped sample with $x=0.2$ both the spin-density-wave transition at $T = 100$ K and the...
Intermediate-valence behavior of the transition-metal oxide CaCu$_3$Ru$_4$O$_{12}$ (2009)
Krimmel, A., Günther, A., Kraetschmer, W., Dekinger, H., Büttgen, N., Eyert, V., ...
The transition--metal oxide CaCu$_3$Ru$_4$O$_{12}$ with perovskite--type structure shows characteristic properties of an intermediate--valence system. The temperature--dependent susceptibility...
Dengler, E., Deisenhofer, J., Khim, Seunghyun, Kim, J. S., Kim, Kee Hoon, ...
Electron spin resonance measurements in EuFe2As2 single crystals revealed an absorption spectrum of a single resonance with Dysonian lineshape. Above the spin-density wave transition at T_SDW = 190 K...
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...
Field cooling memory effect in Bi2212 and Bi2223 single crystals (2009)
Shaltiel, D., Rosenstein, B., Shapiro, B. Ya., Golosovsky., M., Shapiro, I., ...
A memory effect in the Josephson vortex system created by magnetic field in the highly anisotropic superconductors Bi2212 and Bi2223 is demonstrated using microwave power absorption. This surprising...
Krohns, S., Lu, J., Lunkenheimer, P., Brize, V., Autret-Lambert, C., Gervais, M., ...
The present work reports synthesis, as well as a detailed and careful characterization of structural, magnetic, and dielectric properties of differently tempered undoped and doped CaCu3Ti4O12 (CCTO)...
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, phonons and dielectric constant of single crystalline BiFeO3 (2009)
Lu, Jun, Schmidt, M, Lunkenheimer, P, Pimenov, A, Mukhin, A A, Travkin, V D, ...
The magnetic susceptibility between 1.5 and 800 K, the infrared reflectivity at room temperature and the temperature dependence of the dielectric constant at mm-wavelengths are reported for single...
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...
Far-infrared optical excitations in multiferroic TbMnO_3 (2009)
Schmidt, M., Kant, Ch., Rudolf, T., Mayr, F., Mukhin, A. A., Balbashov, A. M., ...
We provide a detailed study of the reflectivity of multiferroic TbMnO_3 for wave numbers from 40 cm^{-1} to 1000 cm^{-1} and temperatures 5 K < T < 300 K. Excitations are studied for polarization...
Dielectric constant of Pr2/3Cu3Ti4O12: Colossal as in CaCu3Ti4O12 (2009)
Sebald, J., Krohns, S., Lunkenheimer, P., Ebbinghaus, S. G., Riegg, S., Reller, A., ...
In the present work we demonstrate that in the series Ln2/3Cu3Ti4O12 with Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Tm, the compounds Pr2/3Cu3Ti4O12 and La2/3Cu3Ti4O12 stand out by showing...
Magnetic and magnetoelectric excitations in TbMnO$_3$ (2009)
Pimenov, A., Shuvaev, A., Loidl, A., Schrettle, F., Mukhin, A. A., Travkin, V. D., ...
Magnetic and magnetoelectric excitations in the multiferroic TbMnO_3 have been investigated at terahertz frequencies. Using different experimental geometries we can clearly separate the...
Colossal dielectric constant up to GHz at room temperature (2008)
Krohns, S., Lunkenheimer, P., Kant, Ch., Pronin, A. V., Brom, H. B., Nugroho, A. A., ...
The search for new materials with extremely high ("colossal") dielectric constants, required for future electronics, is one of the most active fields of modern materials science. However, the...
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...
T Rudolf, Ch Kant, F Mayr, J Hemberger, V Tsurkan, A Loidl
open–access journal for physics Spin-phonon coupling in antiferromagnetic chromium spinels
Structural and magnetic dimers in the spin-gapped system CuTe2O5 (2006)
Deisenhofer, J., Eremina, R. M., Pimenov, A., Gavrilova, T., Berger, H., Johnsson, M., ...
We investigated the magnetic properties of the system CuTe2O5 by susceptibility and electron spin resonance measurements. The anisotropy of the effective g-factors and the ESR linewidth indicates...
Observation of a Griffiths phase in paramagnetic La1-xSrxMnO3 (2005)
Deisenhofer, J., Braak, D., Hemberger, J., Eremina, R. M., Ivanshin, V. A., ...
We report on the discovery of a novel triangular phase regime in the system La1-xSrxMnO3 by means of electron spin resonance and magnetic susceptibility measurements. This phase is characterized by...
Deisenhofer, J., Loidl, A., Ahn, K., Kremer, R. K., Simon, A.
The spin dynamics of GdI_2 have been investigated by ESR spectroscopy. The temperature dependences of the resonance field and ESR intensity are well described by the model for the spin susceptibility...
Millimeter-wave electrodynamics in superconducting MgB§2 films. (2004)
Pimenov, A., Loidl, A., Sidorenko, A., Zdravkov, V., Koch, T., Schimmel, T.
Internat.Conf.'Materials Science and Condensed Matter Physics', MSCMP 2004, Kishinev, MD, September 21-26, 2004
Optical Conductivity and Penetration Depth in MgB2 (2001)
Krasnosvobodtsev, S. I., Loidl, A., Pimenov, A., Pronin, A. V.
Die Eigenschaften des quasi-eindimensionalen Systems Sr§1§-§yLa§yNbO§3§.§5§-§x. (2001)
Kuntscher, C.A., Schuppler, S., Haas, P., Gorshunov, B., Dressel, M., Hemberger, J., ...
65.Physikertagung gemeinsam mit der Frühjahrstagung des Arbeitskreises Festkörperphysik der DPG, Hamburg, 26.-30. März 2001
Analysis of the histone acetyltransferase B complex of maize embryos (1999)
Lusser, A, Eberharter, A, Loidl, A, Goralik-Schramel, M, Horngacher, M, Haas, H, ...
Non-linear susceptibilities and polydispersivity in dipolar glasses (1998)
Böhmer, Roland, Hemberger, J., Loidl, A.
The dipolar glass system D-BP_(40)BPI_(60) was investigated using broadband dielectric spectroscopy over 12 decades in frequency and temperatures between 4K < T < 300 K. The complex dielectric...
Ionic transport and heat capacity of glass-forming metal-nitrate mixtures (1998)
Böhmer, Roland, Pimenov, A., Lunkenheimer, P., Nicklas, M., Loidl, A., Angell, C. A.
Relaxation times at the rate-dependent glass transition (1997)
Böhmer, Roland, Pimenov, A., Loidl, A.
The structural relaxation time near the cooling rate dependent glass transition is determined self-consistently within the Moynihan-Narayanaswami formalism. In order to illustrate the method we...
High-frequency dielectric spectroscopy of glycerol (1996)
Böhmer, Roland, Lunkenheimer, P., Pimenov, A., Schiener, B., Loidl, A.
The phase diagram of (NH4I)x(KI)1-x (1996)
Böhmer, Roland, Paasch, M., Winterlich, M., Sonntag, R., McIntyre, G. C., Loidl, A.
Schwan, C., Schattke, A., Eckert, S., Adrian, H., Schiener, B., Loidl, A.
YBa2Cu3O7-δ/insulator/Au-heterostructures on SrTiO3 or LaAlO3 substrates were prepared to study the properties of the materials SrTiO3, BaTiO3 and CeO2. X-ray diffraction measurements in...
Ion transport in the fragile glass former 3KNO3-2Ca(NO3)2 (1996)
Böhmer, Roland, Pimenov, A., Lunkenheimer, P., Rall, H., Kohlhaas, R., Loidl, A.
Fast dynamics of glass-forming glycerol studied by dielectric spectroscopy (1996)
Böhmer, Roland, Lunkenheimer, P., Pimenov, A., Dressel, M., Goncharov, Yu G., Loidl, A.
Dielectric study of supercooled triphenylphosphite and butyronitrile (1996)
Böhmer, Roland, Schiener, B., Loidl, A., Chamberlin, R. V.
Dielectric relaxation has been studied in the supercooled liquids triphenylphosphite (TPP) and butyrontrile (BN). BN is relatively strong according to Angell's classification and can be characterized...
Quantum paraelectric and induced ferroelectric states in SrTiO3 (1996)
Böhmer, Roland, Hemberger, J., Nicklas, M., Viana, R., Lunkenheimer, P., Loidl, A.
Linear and non-linear dielectric spectroscopy in dipolar glasses (1996)
Böhmer, Roland, Loidl, A., Hemberger, J., Winterlich, M., Ries, H.
NMR studies of the heavy fermion alloy Ce(Cu1-xNix)2Ge2 (1996)
Böhmer, Roland, Büttgen, N., Krimmel, A., Loidl, A.
A detailed 63Cu NMR investigation is presented for the heavy-fermion system Ce(Cu1-xNix)2Ge2, focusing especially on the alloying induced transition from magnetic order to pure Kondo-like behavior....
Ionic motion in bioactive ceramics investigated by dielectric spectroscopy (1995)
Böhmer, Roland, Lunkenheimer, P., Alkemper, J., Fuess, H., Loidl, A.
Ionic conductivity in Li2O-Al2O3-SiO2 based glasses and glass ceramics (1995)
Böhmer, Roland, Lunkenheimer, P., Gerhard, G., Drexler, F., Loidl, A., Pannhorst, W.
Electric field dependent dielectric constant and non-linear susceptibility in SrTiO3 (1995)
Böhmer, Roland, Hemberger, J., Lunkenheimer, P., Viana, R., Loidl, A.
SrTiO3 belongs to the class of incipient ferroelectrics in which an electrically ordered state is suppressed by quantum fluctuations. To investigate the nature of these excitations, we have measured...
Spin fluctuations in the heavy fermion compound CeCu2Ge2 probed by nuclear magnetic resonance (1995)
Dielectric relaxation dynamics in C§6§0 and C§7§0. (1995)
Mondal, P., Lunkenheimer, P., Böhmer, R., Loidl, A., Gugenberger, F., Adelmann, P., ...
Journal of Non-Crystalline Solids, 172-174(1994) S.468-71
Glassy, ceramic, and crystalline aluminosilicates (1994)
Böhmer, Roland, Lotze, M., Lunkenheimer, P., Drexler, F., Gerhard, G., Loidl, A.
Using dielectric techniques in the frequency ranges from 0.01 Hz to 1 GHz and from 60 GHz to 3 THz, the transport, relaxational and vibrational motions of Li ions in stuffed aluminosilicates were...
Dielectric spectroscopy of SrTiO3 (1994)
Böhmer, Roland, Viana, R., Lunkenheimer, P., Hemberger, J., Loidl, A.
Relaxation dynamics in C60 and C70 as studied by dielectric spectroscopy (1994)
Böhmer, Roland, Mondal, P., Lunkenheimer, P., Loidl, A., Gugenberger, F., Adelmann, P., ...
Paraelectric and ferroelectric phases of betaine phosphite (1993)
Böhmer, Roland, Fehst, I., Paasch, M., Hutton, S. L., Braune, M., Loidl, A., ...
The paraelectric and ferroelectric phases of betaine phosphite [BPI: (CH3)3 NCH2COO H3PO3] single crystals have been studied. The structure of BPI was determined at room temperature using x-ray and...
Single particle jumps and correlated ionic motions in glass-ceramics (1993)
Böhmer, Roland, Gerhard, G., Drexler, F., Loidl, A., Ngai, K. L., Pannhorst, W.
Using impedance spectroscopy, the ion transport in poorly Li-conducting aluminosilicate glass ceramics and their precursor glasses has been measured for temperatures 50 K < T < 550 K and covering a...
Calorimetric investigations of (NaCN)1-x(KCN)x orientational glasses (1990)
Böhmer, Roland, Mertz, B., Berret, J. F., Loidl, A., Meissner, M., Knaak, W.
Dielectric study of orientational disorder in (CO2)1-x(N2O)x mixed crystals (1990)
The dipolar relaxation dynamics of solid solutions of carbon dioxide and nitrous oxide has been investigated using dielectric spectroscopy. The temperature dependence of the relaxation rate reveals...
Reorientations and phase transitions in (Kr)1-x(CH4-nDn)x (1990)
The condensed isotopic modifications of methane, CH4, CH2D2, and CD4 and their solutions with Kr were investigated using dielectric techniques. The polarizabilities were computed from the...
Elastic and quasielastic neutron scattering studies in KBr:KCN mixed crystals (1989)
Böhmer, Roland, Loidl, A., Schräder, T., Knorr, K., Mertz, B., McIntyre, G. J., ...
Neutron scattering studies in (KBr)1–x(KCN)x mixed crystals are presented utilizing powder diffraction, single crystal diffraction and time-of-flight techniques. Forx>0.6 (KBr)1–x(KCN)x crystals...
Radio-frequency dielectric measurements at temperatures from 10 to 450 K (1989)
Böhmer, Roland, Maglione, M., Lunkenheimer, P., Loidl, A.
A coaxial air line was constructed to connect a radio-frequency impedance analyzer and a temperature-stabilized sample holder. It is suitable for dielectric measurements in the frequency range 1...
Phonon line-widths in UPt§3. (1989)
Loidl, A., Renker, B., Rietschel, H., Frings, P., Bucher, E., Lux-Steiner, M.Ch.
Journal of Magnetism and Magnetic Materials, 76+77(1988) S.441-43
Dipolar and quadrupolar freezing in (NaCN)1-x(KCN)x (1986)
Böhmer, Roland, Loidl, A., Schräder, T., Knorr, K., Kjems, J. K., Born, R.
Dipolar and quadrupolar freezing in (KBr)1-x(KCN)x (1986)
Böhmer, Roland, Volkmann, U. G., Loidl, A., Knorr, K., Höchli, U. T., Haussühl, S.
Elastic constants in RbI, determined by inelastic neutron scattering. (1979)
Loidl, A., Daubert, J., Muellner, M.
Zeitschrift fuer Physik, B30(1978) S.235-41
Investigations on the dynamics of solids and liquids. (1978)
Anderko, K., Baumann, F., Block, R., Buerkin, J., Burger, N., Christensen, A.N., ...
In: Progress Report. Teilinstitut Nukleare Festkoerperphysik. 1.6.1977-31.5.1978