Teyssier, J., Lortz, R., Petrovic, A., Filippov, V., Shitsevalova, N.
We report a detailed study of specific heat, electrical resistivity and optical spectroscopy in the superconducting boride LuB12 (Tc = 0.4 K) and compare it to the higher Tc compound ZrB12 (Tc = 6...
Lortz, R., Wang, Y., Demuer, A., Böttger, P. H. M., Bergk, B., Zwicknagl, G., ...
The specific heat of the layered organic superconductor $\kappa$-% (BEDT-TTF)$_2$Cu(NCS)$_2$, where BEDT-TTF is bisethylenedithio-% tetrathiafulvalene, has been studied in magnetic fields up to 28 T...
Optical and thermodynamic properties of the high-temperature superconductor HgBa_2CuO_4+delta (2006)
Van Heumen, E., Lortz, R., Kuzmenko, A. B., Carbone, F., Zhao, X., ...
In- and out-of-plane optical spectra and specific heat measurements for the single layer cuprate superconductor Hg-1201 at optimal doping (Tc = 97 K) are presented. Both the in-plane and out-of-plane...
Thermodynamic origin of the peak effect in the superconductor Nb3Sn (2006)
Lortz, R., Musolino, N., Wang, Y., Junod, A., Toyota, N.
We report a pronounced peak effect in the magnetization and the magnetocaloric coefficient in a single crystal of the superconductor Nb3Sn. As the origin of the magnetization peak effect in classical...
Lortz, R., Lin, F., Musolino, N., Wang, Y., Junod, A., Rosenstein, B., ...
The range of critical thermal fluctuations in classical bulk superconductors is extremely small and especially in low fields hardly experimentally inaccessible. With a new type of calorimeter we have...
On the Origin of the Double Superconducting Transition in Overdoped YBa2Cu3Ox (2005)
Lortz, R., Tomita, T., Wang, Y., Junod, A., Schilling, J. S., Masui, T., ...
The superconducting transition in a single overdoped, detwinned YBa2Cu3Ox (YBCO) crystal is studied using four different probes. Whereas the AC and DC magnetic susceptibilities find a dominant...
Lortz, R., Wang, Y., Tutsch, U., Abe, S., Meingast, C., Popovich, P., ...
The superconductor YB6 has the second highest critical temperature Tc among the boride family MBn. We report measurements of the specific heat, resistivity, magnetic susceptibility and thermal...
Plackowski, T., Wang, Y., Lortz, R., Junod, A., Wolf, Th.
A recently developed technique for measuring the isothermal magnetocaloric coefficient ($M_T$) is applied to the study of a superconducting NdBa$_2$Cu$_3$O$_7$ single crystal. Results are compared...
Lortz, R., Wang, Y., Abe, S., Meingast, C., Paderno, Yu. B., Filippov, V., ...
In an attempt to clarify conflicting published data, we report new measurements of specific heat, resistivity, magnetic susceptibility, and thermal expansivity up to room temperature for the 6 K...
Specific heat of Nb_3Sn: The case for a second energy gap (2004)
Guritanu, V., Goldacker, W., Bouquet, F., Wang, Y., Lortz, R., Goll, G., ...
We present new specific heat data for Nb3Sn, a well-known technically applied superconductor with a critical temperature T_c ~ 18 K, in the temperature range from 1.2 to 200 K in zero magnetic field,...
High-Resolution Thermal Expansion of MgB2 (2003)
Lortz, R., Meingast, C., Ernst, D., Renker, B., Lawrie, D. D., Franck, J. P.
The thermal expansion of polycrystalline MgB2 from 5-300 K is studied using high-resolution capacitance dilatometry. The thermal expansivity exhibits a small jump of -5.8x10-8 K-1 at Tc (in accord...
Crystal-lattice coupling to the vortex-melting transition in YBa2Cu3O7-d (2003)
Lortz, R., Meingast, C., Welp, U., Kwok, W. K., Crabtree, G. W.
Distinct discontinuities in the thermal expansion of the crystal lattice are observed at the melting-transition of the vortex lattice in a naturally untwinned reversible YBa2Cu3O7-d-single crystal...
Lortz, R., Meingast, C., Rykov, A. I., Tajima, S.
The effect of strong magnetic fields (11 T) on superconductivity in YBa2Cu3O7-d is investigated using high-resolution thermal expansion. We show that the field-induced broadening of the...