Zobrazeno 1 - 10
of 703
pro vyhledávání: '"Krabbes, G."'
Publikováno v:
Materials Research Bulletin 46 (2011) 675-681
High purity Na0.75CoO2 single crystals have been grown by floating zone method. We found the rotation of feed and seed rods play a crucial role in growing high quality single crystal. Systematic investigations suggest the occurrence of a phase separa
Externí odkaz:
http://arxiv.org/abs/1103.3749
Autor:
Lake, B., Tsvelik, A. M., Notbohm, S., Tennant, D. A., Perring, T. G., Reehuis, M., Sekar, C., Krabbes, G., Büchner, B.
The idea of confinement states that in certain systems constituent particles can be discerned only indirectly being bound by an interaction whose strength increases with increasing particle separation. Though the most famous example is the confinemen
Externí odkaz:
http://arxiv.org/abs/0908.1038
Autor:
Hess, C., ElHaes, H., Waske, A., Büchner, B., Sekar, C., Krabbes, G., Heidrich-Meisner, F., Brenig, W.
Publikováno v:
Phys. Rev. Lett. 98, 027201 (2007)
We present experimental results for the thermal conductivity $\kappa$ of the pseudo 2-leg ladder material $\rm CaCu_2O_3$. The strong buckling of the ladder rungs renders this material a good approximation to a $S=1/2$ Heisenberg-chain. Despite a str
Externí odkaz:
http://arxiv.org/abs/cond-mat/0612298
Autor:
Kroll, T., Knupfer, M., Geck, J., Hess, C., Schwieger, T., Krabbes, G., Sekar, C., Batchelor, D. R., Berger, H., Buechner, B.
Publikováno v:
PHYSICAL REVIEW B 74, 115123 (2006)
Measurements of polarization and temperature dependent soft x-ray absorption have been performed on Na_xCoO_2 single crystals with x=0.4 and x=0.6. They show a deviation of the local trigonal symmetry of the CoO_6 octahedra, which is temperature inde
Externí odkaz:
http://arxiv.org/abs/cond-mat/0606518
Autor:
Rückamp, R., Benckiser, E., Haverkort, M. W., Roth, H., Lorenz, T., Freimuth, A., Jongen, L., Möller, A., Meyer, G., Reutler, P., Büchner, B., Revcolevschi, A., Cheong, S. -W., Sekar, C., Krabbes, G., Grüninger, M.
Publikováno v:
New Journal of Physics 7, 144 (2005)
The orbital excitations of a series of transition-metal compounds are studied by means of optical spectroscopy. Our aim was to identify signatures of collective orbital excitations by comparison with experimental and theoretical results for predomina
Externí odkaz:
http://arxiv.org/abs/cond-mat/0503405
We studied thermochemical characteristics of the Sm1+xBa2-xCu3Oy single crystals by solution calorimetry. Dependences of formation enthalpies from samarium content were constructed. It was established that solid solutions on the bases of Sm123 could
Externí odkaz:
http://arxiv.org/abs/cond-mat/0401277
Autor:
Kim, T. K., Rosner, H., Drechsler, S. -L., Hu, Z., Sekar, C., Krabbes, G., Malek, J., Knupfer, M., Fink, J., Eschrig, H.
Experimental and theoretical studies of the unoccupied electronic structure of CaCu2O3 single crystals have been performed using polarization-dependent x-ray absorption spectroscopy and band structure calculations. The measured hole distribution show
Externí odkaz:
http://arxiv.org/abs/cond-mat/0208180
Autor:
Gruss, S., Fuchs, G., Krabbes, G., Verges, P., Stover, G., Muller, K. -H., Fink, J., Schultz, L.
Improved trapped fields are reported for bulk melt-textured YBa2Cu3O7-x (YBCO) material in the temperature range between 20 K and 50 K. Trapped fields up to 12.2 T were obtained at 22 K on the surface of single YBCO disks (with Ag and Zn additions).
Externí odkaz:
http://arxiv.org/abs/cond-mat/0104396
Publikováno v:
Physica B 284-288, 903 (2000)
The influence of surface treatment on AC loss in melt-processed quasi-single crystal HTS was investigated with resonance oscillations technique. We have found that amplitude dependencies of AC loss on magnetic field amplitude become rather complicate
Externí odkaz:
http://arxiv.org/abs/cond-mat/9907053
Autor:
Hayn, R., Rosner, H., Yushankhai, V. Yu., Haffner, S., Dürr, C., Knupfer, M., Krabbes, G., Golden, M. S., Fink, J., Eschrig, H., Singh, D. J., Hien, N. T., Menovsky, A. A., Jung, Ch., Reichardt, G.
Band structure calculations have been used to identify the different bands contributing to the polarisation-dependent photoemission spectra of the undoped model cuprate Sr$_2$CuO$_2$Cl$_2$ at the high-symmetry points of the CuO$_2$ plane $\Gamma$, $(
Externí odkaz:
http://arxiv.org/abs/cond-mat/9811385