---
_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
arxiv: 1
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. <i>Journal of Physics: Condensed Matter</i>.
    2019;31(48). doi:<a href="https://doi.org/10.1088/1361-648x/ab3b43">10.1088/1361-648x/ab3b43</a>'
  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. <i>Journal of Physics: Condensed Matter</i>. IOP Publishing.
    <a href="https://doi.org/10.1088/1361-648x/ab3b43">https://doi.org/10.1088/1361-648x/ab3b43</a>'
  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.”
    <i>Journal of Physics: Condensed Matter</i>. IOP Publishing, 2019. <a href="https://doi.org/10.1088/1361-648x/ab3b43">https://doi.org/10.1088/1361-648x/ab3b43</a>.'
  ieee: 'E. Martino <i>et al.</i>, “Persistent antiferromagnetic order in heavily
    overdoped Ca1−x La x FeAs2,” <i>Journal of Physics: Condensed Matter</i>, 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.” <i>Journal of Physics: Condensed Matter</i>, vol. 31, no. 48,
    485705, IOP Publishing, 2019, doi:<a href="https://doi.org/10.1088/1361-648x/ab3b43">10.1088/1361-648x/ab3b43</a>.'
  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). <i>Journal of
    Physics: Condensed Matter</i>. 2011;23(10). doi:<a href="https://doi.org/10.1088/0953-8984/23/10/105402">10.1088/0953-8984/23/10/105402</a>'
  apa: 'Salje, E. K. H., Safarik, D. J., Taylor, R. D., Pasternak, M. P., Modic, K.
    A., Groat, L. A., &#38; Lashley, J. C. (2011). Determination of iron sites and
    the amount of amorphization in radiation-damaged titanite (CaSiTiO5). <i>Journal
    of Physics: Condensed Matter</i>. IOP Publishing. <a href="https://doi.org/10.1088/0953-8984/23/10/105402">https://doi.org/10.1088/0953-8984/23/10/105402</a>'
  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).” <i>Journal of Physics: Condensed Matter</i>.
    IOP Publishing, 2011. <a href="https://doi.org/10.1088/0953-8984/23/10/105402">https://doi.org/10.1088/0953-8984/23/10/105402</a>.'
  ieee: 'E. K. H. Salje <i>et al.</i>, “Determination of iron sites and the amount
    of amorphization in radiation-damaged titanite (CaSiTiO5),” <i>Journal of Physics:
    Condensed Matter</i>, 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).” <i>Journal of Physics: Condensed Matter</i>,
    vol. 23, no. 10, 105402, IOP Publishing, 2011, doi:<a href="https://doi.org/10.1088/0953-8984/23/10/105402">10.1088/0953-8984/23/10/105402</a>.'
  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'
...