Inhaltszusammenfassung

The phase diagram for the body-centered-tetragonal superconducting pseudoternary system Ho(Rh1-xRux)4B4 (0.07?x?1) is reported for temperatures above 1.3 K, revealing an abrupt drop in the superconducting critical temperature Tc near the critical concentration xcr?0.40, which is characteristic for this class of compounds. In order to clarify the origin of this phenomenon, synchrotron radiation from the DORIS storage ring (Hamburg, Germany) has been used to measure high-resolution photoemissio...The phase diagram for the body-centered-tetragonal superconducting pseudoternary system Ho(Rh1-xRux)4B4 (0.07?x?1) is reported for temperatures above 1.3 K, revealing an abrupt drop in the superconducting critical temperature Tc near the critical concentration xcr?0.40, which is characteristic for this class of compounds. In order to clarify the origin of this phenomenon, synchrotron radiation from the DORIS storage ring (Hamburg, Germany) has been used to measure high-resolution photoemission spectra for samples with x=0.07,0.37, and 0.90. The analysis of the valence-band data near the Fermi energy EF shows a shift of EF to lower energies with increasing x relative to the transition-metal d-electron structure. The results are consistent with existing band-structure calculations for the primitive-tetragonal modification of this structure type and provide a straightforward explanation of the observed Tc behavior. » weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik