Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Jurgen P. Franck"'
Autor:
Christophe Marcenat, Christoph Meingast, Rolf Lortz, I. Isaac, J. E. Gordon, Guanwen Zhang, Norman E. Phillips, F. Bouquet, Jurgen P. Franck, R. A. Fisher
Publikováno v:
Journal of Superconductivity: Incorporating Novel Magnetism. 15:571-577
We present a study of the paramagnetic to ferromagnetic transition in the CMR compound La0.65Ca0.35MnO3 and its dependence on magnetic field and oxygen mass. The transition is characterized by two temperatures, the thermodynamic transition temperatur
Autor:
R. L. Meng, A. K. Heilman, Y. S. Wang, Jurgen P. Franck, Weimin Chen, Y.Y. Xue, C.W. Chu, Bernd Lorenz, Y. Y. Sun
Publikováno v:
Physical Review B. 61:8950-8954
Thermoelectric power (S) and lattice parameter $(a,$ b, $c)$ measurements are used to determine the change in the carrier concentration (n) in both isotope exchanged and oxygen deficient samples of ${\mathrm{La}}_{0.65}{\mathrm{Ca}}_{0.35}{\mathrm{Mn
Publikováno v:
Physical Review B. 60:R14998-R15001
We have measured the O-isotope effects on the magnetic and electrical properties of ${\mathrm{La}}_{0.65}{\mathrm{Ca}}_{0.35}{\mathrm{MnO}}_{3}$ under hydrostatic pressure up to 1.9 GPa. The pressure was found to reversibly enhance the metal-insulato
Publikováno v:
Journal of Physics: Condensed Matter. 11:8921-8931
Emission M?ssbauer effect investigations were done simultaneously with resistivity measurements on two similar samples of La0.8Ca0.2Mn(57Co)O3, in one of which 18O was substituted for 16O. Only a few parts per million of 57Co were substituted for Mn
Publikováno v:
Physical Review B. 60:3527-3531
Features in the normal-state resistivity of underdoped ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{Ca}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{10}$ (Bi-2223) single crystals have been observed, in which an upturn deviation from the linear $\ensuremath{\rh
Publikováno v:
Physical Review B. 59:9362-9371
Raman-scattering experiments have been carried out on polycrystalline samples of ${\mathrm{La}}_{0.65}{\mathrm{Ca}}_{0.35}{\mathrm{Mn}\mathrm{}}^{16}{\mathrm{O}}_{3}$ and isotope-exchanged ${\mathrm{La}}_{0.65}{\mathrm{Ca}}_{0.35}{\mathrm{Mn}\mathrm{
Autor:
Vladimir Chechersky, H. L. Ju, I. Isaac, Richard L. Greene, Amar Nath, Kartik Ghosh, Jurgen P. Franck
Publikováno v:
Physical Review B. 59:497-502
We report an emission M\"ossbauer study of the ferromagnetic metal ${\mathrm{La}}_{0.8}{\mathrm{Ca}}_{0.2}{\mathrm{M}\mathrm{n}(}^{57}{\mathrm{C}\mathrm{o})\mathrm{O}}_{3},$ where a few parts-per-million of Mn are replaced by ${}^{57}\mathrm{Co}.$ Th
Publikováno v:
Journal of Superconductivity. 12:263-267
Oxygen isotope effect studies of the ferromagnetic Curie temperature Tc of La1−xCaxMnO3 are presented. The isotope exponent α0=−ΔlnTc/Δlnm0 changes from 0.4 to 0.14 in the range 0.2
Publikováno v:
Physical Review B. 58:5189-5192
The oxygen-isotope effect of the ferromagnetic transition in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ was investigated from $x=20%$ to $x=43%.$ This is the range of the conducting ferromagnetic phase. We find that ${\ensu
Publikováno v:
Physica C: Superconductivity. 297:59-63
The incommensurate antiferromagnetic transition near 230 K, and the commensurate antiferromagnetic transition near 210 K of CuO were investigated for isotopically pure 63 CuO, 65 CuO, Cu 16 O , and Cu 18 O samples. No isotopic shift was observed with