D. Andres

Attocube Systems (Germany)

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M. V. Kartsovnı̆k

Bavarian Academy of Sciences and Humanities

W. Biberacher

Bavarian Academy of Sciences and Humanities

H. Müller

European Synchrotron Radiation Facility

N.D. Kushch

Institute of Problems of Chemical Physics

K. Neumaier

Bavarian Academy of Sciences and Humanities

P. D. Grigoriev

Landau Institute for Theoretical Physics

I. Sheikin

Laboratoire National des Champs Magnétiques Intenses

H. Weiß

OSRAM (Germany)

E. Balthes

University of Stuttgart

P. Christ

Max Planck Society

Cooperative Institutions

Centre National de la Recherche Scientifique

Attocube Systems (Germany)

Bavarian Academy of Sciences and Humanities

Laboratoire National des Champs Magnétiques Intenses

Russian Academy of Sciences

Technical University of Munich

Institute of Solid State Physics

Vrije Universiteit Amsterdam

Institute of Problems of Chemical Physics

Max Planck Society

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Direct evidence for superconductivity in the organic charge density wave compound α-(BEDT-TTF)₂KHg(SCN)₄ under hydrostatic pressure

Journal de Physique IV (Proceedings) (2002)

D. Andres M. V. Kartsovnı̆k W. Biberacher K. Neumaier H. Müller

Hydrostatic pressure

Charge Density Wave

Alpha (finance)

Organic superconductor

10.1051/jp4:20020364

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Citations (7)

Field-induced charge-density-wave transitions in the organic metal α-(BEDT-TTF)2KHg(SCN)4 under pressure

Low Temperature Physics (2011)

D. Andres M. V. Kartsovnı̆k W. Biberacher K. Neumaier I. Sheikin

Successive magnetic-field-induced charge-density-wave transitions in the layered molecular conductor α-(BEDT-TTF)2KHg(SCN)4 are studied in a hydrostatic pressure regime in which the zero field charge-density- wave (CDW) state is completely suppressed. It is shown that the orbital effect of the magnetic field restores the density wave, while orbital quantization induces transitions between different CDW states as the field strength is varied. The latter show up as distinct anomalies in the magnetoresistance as a function of field. The interplay between the orbital and Pauli paramagnetic effects, which act, respectively, to enhance and to suppress the CDW instability, is particularly manifest in the angular dependence of the field-induced anomalies.

Charge Density Wave

Hydrostatic pressure

Charge density

Pauli exclusion principle

10.1063/1.3670031

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Citations (10)

Note: Ferrule-top atomic force microscope. II. Imaging in tapping mode and at low temperature

Review of Scientific Instruments (2011)

Dhwajal Chavan D. Andres Davide Iannuzzi

In a recent paper [D.Chavan et al., Rev. Sci. Instrum. 81, 123702 (2010)] we have demonstrated that ferrule-top cantilevers, obtained by carving the end of a ferruled fiber, can be used for contact mode atomic force microscopy in ambient conditions. Here we show that those probes can provide tapping mode images at both room and cryogenic temperatures (12 K).

Ferrule

Tapping

Carving

10.1063/1.3579496

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Citations (17)

Hierarchy of the density-wave states and superconductivity in the organic conductor α-(BEDT-TTF)2KHg(SCN)4

Comptes Rendus Chimie (2006)

M. V. Kartsovnı̆k D. Andres W. Biberacher

Charge Density Wave

Organic superconductor

Density of states

10.1016/j.crci.2006.06.009

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Citations (5)

The phase diagram of a-(BEDT-TTF)2KHg(SCN)4 for magnetic fields almost parallel to the layers

Synthetic Metals (2001)

P. Christ W. Biberacher D. Andres M. V. Kartsovnı̆k E. Balthes

10.1016/s0379-6779(00)01044-4

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Citations (0)

Evaluación de la eficacia de albendazol versus closantel, para la eliminación de nematodos gastrointestinales adquiridos de forma natural en caprinos

Coburger Ortega D. Andres

En la presente investigacion se compararon dos diferentes tratamientos antihelminticos, estos son: albendazol versus closantel. Se selecciono albendazol por su amplio espectro, facil administracion y facil acceso en el pais. Se selecciono closantel, por ser un medicamento poco utilizado en el pais, ademas de tener un amplio espectro contra nematodos gastrointestinales. Se busco comparar los resultados de ambos tratamientos, eficacia del tratamiento y tiempo que tardaron en reinfectarse los caprinos. Se utilizaron 30 animales para dicha investigacion, procurando que sea un lote uniforme. Los animales fueron divididos en dos grupos de 15 animales cada uno, el grupo A, tendra un tratamiento de albendazol, a este grupo se le administro una dosis de 7.5 mg/Kg por animal, y al grupo B se le administro un tratamiento de closantel a una dosis de 5 mg/kg, todos los medicamentos fueron administrados por via oral. Se realizaron muestreos coproparasitologicos, mediante la tecnica de McMaster, a los 8, 15, 21, 30 y 40 dias de realizado el primer muestreo y administrado los tratamientos. Los resultados obtenidos durante el experimento, demostraron que el tratamiento basado en el principio activo closantel fue mas efectivo en la eliminacion de los nematodos Oesophagostomum sp., Haemonchus sp. y Chabertia ovina. Mientras que ninguno de los dos tratamientos utilizados mostro una diferencia estadisticamente significativa en la eliminacion de los generos Trichuris sp., Trichostrongylus sp. y Strongyloides.

Source

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Citations (0)

Scanning probe microscopy in an ultra-low vibration closed-cycle cryostat

arXiv (Cornell University) (2014)

Francesca Paola Quacquarelli Jorge Puebla Thomas Scheler D. Andres C. Bödefeld

We report on state-of-the-art scanning probe microscopy measurements performed in a pulse tube based top-loading closed-cycle cryostat with a base temperature of 4 K and a 9 T magnet. We decoupled the sample space from the mechanical and acoustic noise from the cryocooling system to enable scanning probe experiments. The extremely low vibration amplitudes in our system enabled successful imaging of 0.39 nm lattice steps on single crystalline SrTiO$_{3}$ as well as magnetic vortices in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+x}$ superconductor. Fine control over sample temperature and applied magnetic field further enabled us to probe the helimagnetic and the skyrmion-lattice phases in Fe$_{0.5}$Co$_{0.5}$Si with unprecedented signal-to-noise ratio of 20:1. Finally, we demonstrate for the first time quartz-crystal tuning fork shear-force microscopy in a closed-cycle cryostat.

Cryostat

10.48550/arxiv.1404.2046

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Citations (1)

Interplay between the orbital quantization and Pauli effect in a charge-density-wave organic conductor

Physica B Condensed Matter (2004)

M. V. Kartsovnı̆k D. Andres P. D. Grigoriev W. Biberacher H. Müller

Pauli exclusion principle

Charge Density Wave

Charge density

Wave vector

10.1016/j.physb.2004.01.108

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Citations (9)

Magnetic quantum oscillations in the charge-density-wave state of the organic metals α-(BEDT-TTF)2MHg(SCN)4 with M = K and Tl

Low Temperature Physics (2014)

M. V. Kartsovnı̆k Vladimir N. Zverev D. Andres W. Biberacher Toni Helm

The low-temperature charge-density-wave (CDW) state in the layered organic metals $\alpha $-(BEDT-TTF)$_2$MHg(SCN)$_4$ has been studied by means of the Shubnikov -- de Haas and de Haas -- van Alphen effects. In addition to the dominant alpha-frequency, which is also observed in the normal state, both the magnetoresistance and magnetic torque possess a slowly oscillating component. These slow oscillations provide a firm evidence for the CDW-induced reconstruction of the original cylindrical Fermi surface. The alpha-oscillations of the interlayer magnetoresistance exhibit an anomalous phase inversion in the CDW state, whereas the de Haas -- van Alphen signal maintains the normal phase. We argue that the anomaly may be attributed to the magnetic-breakdown origin of the alpha-oscillations in the CDW state. A theoretical model illustrating the possibility of a phase inversion in the oscillating interlayer conductivity in the presence of a spatially fluctuating magnetic breakdown gap is proposed.

Charge Density Wave

Anomaly (physics)

Oscillation (cell signaling)

Shubnikov–de Haas effect

10.1063/1.4869592

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Citations (8)

Angle-Dependent Magnetoresistance in the Weakly Incoherent Interlayer Transport Regime in a Layered Organic Conductor

Physical Review Letters (2006)

M. V. Kartsovnı̆k D. Andres Sergey V. Simonov W. Biberacher I. Sheikin

We present comparative studies of the orientation effect of a strong magnetic field on the interlayer resistance of alpha-(BEDT-TTF)2KHg(SCN)4 samples characterized by different crystal quality. We find striking differences in their behavior, which is attributed to the breakdown of the coherent charge transport across the layers in the lower quality sample. In the latter case, the nonoscillating magnetoresistance background is essentially a function of only the out-of-plane field component, in contradiction to the existing Fermi-liquid theories.

Crystal (programming language)

10.1103/physrevlett.96.166601

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Citations (39)