---
_id: '7056'
abstract:
- lang: eng
text: "In the Ca1−x La x FeAs2 (1 1 2) family of pnictide superconductors, we have
investigated a highly overdoped composition (x = 0.56), prepared by a high-pressure,
high-temperature synthesis. Magnetic measurements show an antiferromagnetic transition
at T N = 120 K, well above the one at lower doping (0.15 < x < 0.27).\r\n\r\nBelow
the onset of long-range magnetic order at T N, the electrical resistivity is strongly
reduced and is dominated by electron–electron interactions, as evident from its
temperature dependence. The Seebeck coefficient shows a clear metallic behavior
as in narrow band conductors. The temperature dependence of the Hall coefficient
and the violation of Kohler's rule agree with the multiband character of the material.
No superconductivity was observed down to 1.8 K. The success of the high-pressure
synthesis encourages further investigations of the so far only partially explored
phase diagram in this family of Iron-based high temperature superconductors.\r\n"
article_number: '485705'
article_processing_charge: No
article_type: original
author:
- first_name: Edoardo
full_name: Martino, Edoardo
last_name: Martino
- first_name: Maja D
full_name: Bachmann, Maja D
last_name: Bachmann
- first_name: Lidia
full_name: Rossi, Lidia
last_name: Rossi
- first_name: Kimberly A
full_name: Modic, Kimberly A
id: 13C26AC0-EB69-11E9-87C6-5F3BE6697425
last_name: Modic
orcid: 0000-0001-9760-3147
- first_name: Ivica
full_name: Zivkovic, Ivica
last_name: Zivkovic
- first_name: Henrik M
full_name: Rønnow, Henrik M
last_name: Rønnow
- first_name: Philip J W
full_name: Moll, Philip J W
last_name: Moll
- first_name: Ana
full_name: Akrap, Ana
last_name: Akrap
- first_name: László
full_name: Forró, László
last_name: Forró
- first_name: Sergiy
full_name: Katrych, Sergiy
last_name: Katrych
citation:
ama: 'Martino E, Bachmann MD, Rossi L, et al. Persistent antiferromagnetic order
in heavily overdoped Ca1−x La x FeAs2. Journal of Physics: Condensed Matter.
2019;31(48). doi:10.1088/1361-648x/ab3b43'
apa: 'Martino, E., Bachmann, M. D., Rossi, L., Modic, K. A., Zivkovic, I., Rønnow,
H. M., … Katrych, S. (2019). Persistent antiferromagnetic order in heavily overdoped
Ca1−x La x FeAs2. Journal of Physics: Condensed Matter. IOP Publishing.
https://doi.org/10.1088/1361-648x/ab3b43'
chicago: 'Martino, Edoardo, Maja D Bachmann, Lidia Rossi, Kimberly A Modic, Ivica
Zivkovic, Henrik M Rønnow, Philip J W Moll, Ana Akrap, László Forró, and Sergiy
Katrych. “Persistent Antiferromagnetic Order in Heavily Overdoped Ca1−x La x FeAs2.”
Journal of Physics: Condensed Matter. IOP Publishing, 2019. https://doi.org/10.1088/1361-648x/ab3b43.'
ieee: 'E. Martino et al., “Persistent antiferromagnetic order in heavily
overdoped Ca1−x La x FeAs2,” Journal of Physics: Condensed Matter, vol.
31, no. 48. IOP Publishing, 2019.'
ista: 'Martino E, Bachmann MD, Rossi L, Modic KA, Zivkovic I, Rønnow HM, Moll PJW,
Akrap A, Forró L, Katrych S. 2019. Persistent antiferromagnetic order in heavily
overdoped Ca1−x La x FeAs2. Journal of Physics: Condensed Matter. 31(48), 485705.'
mla: 'Martino, Edoardo, et al. “Persistent Antiferromagnetic Order in Heavily Overdoped
Ca1−x La x FeAs2.” Journal of Physics: Condensed Matter, vol. 31, no. 48,
485705, IOP Publishing, 2019, doi:10.1088/1361-648x/ab3b43.'
short: 'E. Martino, M.D. Bachmann, L. Rossi, K.A. Modic, I. Zivkovic, H.M. Rønnow,
P.J.W. Moll, A. Akrap, L. Forró, S. Katrych, Journal of Physics: Condensed Matter
31 (2019).'
date_created: 2019-11-19T12:56:17Z
date_published: 2019-09-03T00:00:00Z
date_updated: 2021-01-12T08:11:35Z
day: '03'
doi: 10.1088/1361-648x/ab3b43
extern: '1'
external_id:
arxiv:
- '1905.08640'
intvolume: ' 31'
issue: '48'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1905.08640
month: '09'
oa: 1
oa_version: Preprint
publication: 'Journal of Physics: Condensed Matter'
publication_identifier:
eissn:
- 1361-648X
issn:
- 0953-8984
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
status: public
title: Persistent antiferromagnetic order in heavily overdoped Ca1−x La x FeAs2
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 31
year: '2019'
...
---
_id: '7076'
abstract:
- lang: eng
text: Iron is a ubiquitous impurity in metamict (radiation-damaged and partially
amorphized) materials such as titanite (CaSiTiO5). Using 57Fe Mössbauer spectroscopy
we find that iron in metamict titanite is partitioned between amorphous and crystalline
regions based on valence. Trivalent iron exists in the crystalline titanite matrix
whereas divalent iron exists almost exclusively in radiation-amorphized regions.
We find that the relative abundances of the oxidation states correlate with the
volume fraction of amorphous and crystalline regions. Our data also show that
oxidation of iron proceeds along with the recrystallization of the amorphized
regions. Recrystallization is confirmed to occur over the range 700 °C < T < 925 °C,
and no further structural changes are observed at higher temperatures. It is surprising
that our Mössbauer measurements show divalent iron to be surrounded by titanite
with a high degree of short-range structural order in the amorphized regions.
This observation is fundamentally different from other metamict materials such
as zircon (ZrSiO4), where amorphized regions show no short-range order.
article_number: '105402'
article_processing_charge: No
article_type: original
author:
- first_name: E K H
full_name: Salje, E K H
last_name: Salje
- first_name: D J
full_name: Safarik, D J
last_name: Safarik
- first_name: R D
full_name: Taylor, R D
last_name: Taylor
- first_name: M P
full_name: Pasternak, M P
last_name: Pasternak
- first_name: Kimberly A
full_name: Modic, Kimberly A
id: 13C26AC0-EB69-11E9-87C6-5F3BE6697425
last_name: Modic
orcid: 0000-0001-9760-3147
- first_name: L A
full_name: Groat, L A
last_name: Groat
- first_name: J C
full_name: Lashley, J C
last_name: Lashley
citation:
ama: 'Salje EKH, Safarik DJ, Taylor RD, et al. Determination of iron sites and the
amount of amorphization in radiation-damaged titanite (CaSiTiO5). Journal of
Physics: Condensed Matter. 2011;23(10). doi:10.1088/0953-8984/23/10/105402'
apa: 'Salje, E. K. H., Safarik, D. J., Taylor, R. D., Pasternak, M. P., Modic, K.
A., Groat, L. A., & Lashley, J. C. (2011). Determination of iron sites and
the amount of amorphization in radiation-damaged titanite (CaSiTiO5). Journal
of Physics: Condensed Matter. IOP Publishing. https://doi.org/10.1088/0953-8984/23/10/105402'
chicago: 'Salje, E K H, D J Safarik, R D Taylor, M P Pasternak, Kimberly A Modic,
L A Groat, and J C Lashley. “Determination of Iron Sites and the Amount of Amorphization
in Radiation-Damaged Titanite (CaSiTiO5).” Journal of Physics: Condensed Matter.
IOP Publishing, 2011. https://doi.org/10.1088/0953-8984/23/10/105402.'
ieee: 'E. K. H. Salje et al., “Determination of iron sites and the amount
of amorphization in radiation-damaged titanite (CaSiTiO5),” Journal of Physics:
Condensed Matter, vol. 23, no. 10. IOP Publishing, 2011.'
ista: 'Salje EKH, Safarik DJ, Taylor RD, Pasternak MP, Modic KA, Groat LA, Lashley
JC. 2011. Determination of iron sites and the amount of amorphization in radiation-damaged
titanite (CaSiTiO5). Journal of Physics: Condensed Matter. 23(10), 105402.'
mla: 'Salje, E. K. H., et al. “Determination of Iron Sites and the Amount of Amorphization
in Radiation-Damaged Titanite (CaSiTiO5).” Journal of Physics: Condensed Matter,
vol. 23, no. 10, 105402, IOP Publishing, 2011, doi:10.1088/0953-8984/23/10/105402.'
short: 'E.K.H. Salje, D.J. Safarik, R.D. Taylor, M.P. Pasternak, K.A. Modic, L.A.
Groat, J.C. Lashley, Journal of Physics: Condensed Matter 23 (2011).'
date_created: 2019-11-19T13:39:30Z
date_published: 2011-02-21T00:00:00Z
date_updated: 2021-01-12T08:11:43Z
day: '21'
doi: 10.1088/0953-8984/23/10/105402
extern: '1'
intvolume: ' 23'
issue: '10'
language:
- iso: eng
month: '02'
oa_version: None
publication: 'Journal of Physics: Condensed Matter'
publication_identifier:
issn:
- 0953-8984
- 1361-648X
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
status: public
title: Determination of iron sites and the amount of amorphization in radiation-damaged
titanite (CaSiTiO5)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 23
year: '2011'
...