UC Irvine
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Title
EPR, magnetization, and resistivity studies in doped (4‐f or 3‐d ions) and undoped
RBa2Cu3Oy high TC superconductors (R=Y,Pr,Nd,Eu,Gd,Ho,Er, or Yb) (abstract)
Permalink
https://escholarship.org/uc/item/45738945
Journal
Journal of Applied Physics, 63(8)
ISSN
0021-8979
Authors
Vier, DC
Smyth, JF
Salling, CT
et al.
Publication Date
1988-04-15
DOI
10.1063/1.340224
Copyright Information
This work is made available under the terms of a Creative Commons Attribution License,
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University of California
EPR, magnetization, and resistivity studies in doped
(4-f
or
3-d
ions)
and undoped
RBa
2
Cu
3
0y
high Tc superconductors
(R=
V,Pr,Nd,Eu,Gd,Ho,Er,
or
Yb) (abstract)a>
D.
C. Vier,
j_
F. Smyth,
C.
T. Salling,
S.
Schu!tz, Y. Dalichaouch, B.
W.
Lee,
K.
N. Yang, M. Torikachvili, and M. B. Mapfe
Unhiersity
of
California,
San
Diego,
La
Jolla, Califomia 92093
S.
B.
Oseroff
San
Diego
State
U11iversity
,
San
Diego, Califomia 92182
Z.
Fisk, J. D. Thompson, J.
l.
Smith,
and
E.
Zimgiebl
Los
Alamos
National Laboratory,
Los
Aiamos,
New
Mexico 87545
We
have
measured electron paramagnetic resonance
(EPR)
, resistivity,
and
de
susceptibility
from 2
to
300 K
for
the
oxide high T„ superconductors (R)B<i-zCu
3
0Y
CR=
Y,Pr,Nd,Eu
,
Gd,Ho,Er,Tm,
or
Yb)
. Selected systems were
doped
with
3-d
ions
(Cr,Mn,Fe
,Ni,Co,
or
Zn)
or
4:fions
(Gd
or
Er)
which presumably
substitute
for
the
Cu
or
R
site, respectively.
In
the
systems
studied
we
have observed
an
EPR
line
at
low temperatures
( T < 40
K),
whicb exhibits
an
increase in intensity
and
decrease in field for resonance
as
the
temperature
is
lowered.
The
ESR
linewidth is also
temperature
dependent
and
exhibits a
minimum
at
about
i 5
K.
An
additional
EPR
line
that
can
be
associated
with
a
GdH,
Mnz+
or
Er
3
+ ion was observed
for
those samples
where
these
ions
were
present
as dilute impurities.
In
some
of
the
samples
another
EPR
signai is observed with properties t.hat
depend
on
sample
preparation
condi
tions.
The
behavior
and
origin
of
all lines wiU be discussed.
The
variation
of
Tc
with
concentration
of
the
addcd
impurities over
the
range (
1%-15%)
will also
be
presented,
and
compared
with
previous studies in
other
superconducting systems.
->This wock was
supportcd
by
tbe
National
Sci
encc
Foundation
under
Grants
Nos.
DMR
-86-13858
and
DMR-84-11839,
the
U.S.
Departmen
t
ofEnergy
under
Grant
No. DE-FG03-86ER45230, and Los Alamos N
a-
tional
Laborat
ories.
Magnetic ordering and crystal field effects in REBa
2
Cu
3
0
7
_x
(RE=
Gd, Dy,
Ho,
Er)a>
(abstract)
8.
D.
Dunlap, M. Slaski,bl
D.
G. Hinks, C. Segre,c)
K.
Zhang,c>
l.
Soderholm,
M.
Beno,
G.
W. Crabtree, W.
K.
Kwok, S.
K.
Malik
,
dl
l.
K.
Schuller, J. D. Jorgensen,
and
Z.
Sungaila
Argonne National Laboratory, Argonne, l/linois 60439
Heat
capacity, resistivity
and
magnetic susceptibifüy
data
have
been used
to
study
electronic
and
magnctic
prop
erties
ofREBa
1
Cu
3
0
7
„ c
ompounds.
Neutron
ditfraction
on
the
Ho
compound
shows identical crystai
structure
to
YBa
'.!
Cu
3
0
6
.
8
•
All
the
compounds
are
superconducting
at
1~
= ( 93 ±
2)
K. Magnetic transitions
are
observed in
the
heat
capacity
data
at
7~„
= 2.2,
0.95
, 0.17,
and
0.59 K for
RE
=
Gd
,
Dy
,
Ho,
and
Er,
respectively,
and
the
magnetically
ordered
state
is
found to coexist with superconductivity. Estimates
have
been
obtained for
the
magnetic
moment
in
the
crystaJ field
ground
state
and
the
energy splitting
of
the
first excited
siate
crystal
field level.
"
1
Work
supported
by
the
U.S.
Departmcnt
ofEne
r
gy
, BES-Materials Sci-
ences
and
Chemica
l Scienccs,
under
Contrac
t
No
. W -31-
!09-cNG
-
38.
bl
Permane
nt addre!>s: lnsc. Phys.
Po!
ytech„
Krakow
, Poland.
•·
1
Permanent
address:
Dept
.
Phy
s., lllinois
of
Technology, Chicago,
fL
60680.
dJ
Permanent
ad<lrcss:
Tata
Inst.
Fundamen
tal Res., Bombay.
lndia.
4202
J. Appl. Phys.
63
(8}
,
i5
April 1968 0021 -8979/88/084202·01 $02.40
© 1988 American Institute
of
Physics 4202