Magnetic phase transformations and superconductivity in Dy 0.8 Y 0.2 Rh 4 B 4
The results of experimental studies of the magnetic and the superconducting properties of the compound Dy 0.8 Y 0.2 Rh 4 B 4 with tetragonal body-centered crystal structure of the perovskite type ( Lu Ru 4 B 4 ) are presented. It is shown that the compound undergoes a paramagnet-ferrimagnet phase tr...
Gespeichert in:
Veröffentlicht in: | Low temperature physics (Woodbury, N.Y.) N.Y.), 2008-11, Vol.34 (11), p.909-917 |
---|---|
Hauptverfasser: | , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | The results of experimental studies of the magnetic and the superconducting properties of the compound
Dy
0.8
Y
0.2
Rh
4
B
4
with tetragonal body-centered crystal structure of the perovskite type
(
Lu
Ru
4
B
4
)
are presented. It is shown that the compound undergoes a paramagnet-ferrimagnet phase transition at the Curie temperature
T
C
≈
30.5
K
and its magnetic compensation temperature
T
comp
≈
17
K
. According to resistance measurements, the compound becomes a ferrimagnetic superconductor at
T
c
onset
≈
5.9
K
which undergoes a ferrimagnet-antiferromagnet phase transition at
T
N
≈
2.7
K
while still remaining a superconductor. The specific heat exhibits a sharp maximum at this temperature. Point-contact Andreev reflection spectroscopy is used to measure the temperature and field dependences of the order parameter
Δ
(
T
,
H
)
and the temperature dependence of the upper critical field
H
c
2
(
T
)
. The dependences obtained differ radically from those generally accepted for conventional superconductors. The results obtained are discussed in connection with the possibility of triplet pairing in
Dy
0.8
Y
0.2
Rh
4
B
4
. |
---|---|
ISSN: | 1063-777X 1090-6517 |
DOI: | 10.1063/1.3009586 |