98 research outputs found
Observation of superconductivity and enhanced upper critical field of -carbide-type oxide ZrPdO
We report the first observation of bulk superconductivity of a
-carbide-type oxide ZrPdO. The crystal structure and the
superconducting properties were studied through synchrotron X-ray diffraction,
magnetization, electrical resistivity, and specific heat measurement. The
superconducting transition was observed at = 2.73 K. Our
measurement revealed that the -carbide-type oxide superconductor
ZrPdO shows an enhanced upper critical field
= 6.72 T, which violates the
Pauli-Clogston limit = 5.29 T. On the other
hand, we found that the enhanced upper critical field is absent in a Rh
analogue ZrRhO. The large
of ZrPdO would be
raised from strong spin-orbit coupling with Pd-4 electrons. The discovery of
new superconducting properties for ZrPdO would shed light on the
further development of -carbide-type oxide superconductors.Comment: 12 pages, 4 figures, 3 table
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