Angle-resolved photoemission spectroscopy study of rare-earth tritelluride charge density wave compounds: RTe 3 (R = Pr, Er)
Abstract The electronic structures of layered rare-earth tritelluride R Te 3 ( R = Pr, Er) charge density wave (CDW) compounds have been investigated by performing R 4 d → 4 f resonant photoemission spectroscopy (RPES) and angle-resolved photoemission spectroscopy (ARPES) measurements for high-quali...
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Published in | Electronic Structure Vol. 3; no. 2; p. 24003 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.06.2021
|
Online Access | Get full text |
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Summary: | Abstract
The electronic structures of layered rare-earth tritelluride
R
Te
3
(
R
= Pr, Er) charge density wave (CDW) compounds have been investigated by performing
R
4
d
→ 4
f
resonant photoemission spectroscopy (RPES) and angle-resolved photoemission spectroscopy (ARPES) measurements for high-quality single crystals.
R
4
d
→ 4
f
RPES measurements reveal that the
R
4
f
states do not contribute directly to the CDW formation in
R
Te
3
but that the
R
4
f
-Te 5
p
hybridization in PrTe
3
is significantly larger than that in ErTe
3
. In the photon-energy maps for the Fermi-edge (
E
F
)-crossing states in
R
Te
3
, straight vertical dispersions are observed along
k
c
, demonstrating the 2D character for the near-
E
F
states in both
R
= Pr and Er. This finding implies the weak interlayer interaction between
R
-Te(1) and Te(2)–Te(3) layers, which is supported by the similar linear dichroism in ARPES for PrTe
3
and ErTe
3
. The CDW-induced Fermi surface of PrTe
3
exhibits two-fold symmetric features while that of ErTe
3
exhibits four-fold symmetric features. This finding reveals different CDW distortions in PrTe
3
and ErTe
3
, the origin of which is likely to be different ionic sizes of
R
ions and different
R
4
f
-Te 5
p
hybridization. |
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ISSN: | 2516-1075 2516-1075 |
DOI: | 10.1088/2516-1075/abfeb1 |