[{"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1905.08640"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","status":"public","publication_identifier":{"issn":["0953-8984"],"eissn":["1361-648X"]},"oa":1,"type":"journal_article","date_published":"2019-09-03T00:00:00Z","language":[{"iso":"eng"}],"oa_version":"Preprint","article_number":"485705","month":"09","publication":"Journal of Physics: Condensed Matter","volume":31,"extern":"1","day":"03","arxiv":1,"doi":"10.1088/1361-648x/ab3b43","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"}],"year":"2019","citation":{"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).","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>.","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.","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>","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>","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."},"date_updated":"2021-01-12T08:11:35Z","external_id":{"arxiv":["1905.08640"]},"publisher":"IOP Publishing","article_type":"original","quality_controlled":"1","article_processing_charge":"No","date_created":"2019-11-19T12:56:17Z","publication_status":"published","intvolume":"        31","title":"Persistent antiferromagnetic order in heavily overdoped Ca1−x La x FeAs2","_id":"7056","issue":"48","author":[{"full_name":"Martino, Edoardo","first_name":"Edoardo","last_name":"Martino"},{"full_name":"Bachmann, Maja D","last_name":"Bachmann","first_name":"Maja D"},{"first_name":"Lidia","last_name":"Rossi","full_name":"Rossi, Lidia"},{"orcid":"0000-0001-9760-3147","full_name":"Modic, Kimberly A","first_name":"Kimberly A","last_name":"Modic","id":"13C26AC0-EB69-11E9-87C6-5F3BE6697425"},{"full_name":"Zivkovic, Ivica","last_name":"Zivkovic","first_name":"Ivica"},{"first_name":"Henrik M","last_name":"Rønnow","full_name":"Rønnow, Henrik M"},{"first_name":"Philip J W","last_name":"Moll","full_name":"Moll, Philip J W"},{"last_name":"Akrap","first_name":"Ana","full_name":"Akrap, Ana"},{"full_name":"Forró, László","first_name":"László","last_name":"Forró"},{"last_name":"Katrych","first_name":"Sergiy","full_name":"Katrych, Sergiy"}]},{"type":"journal_article","date_published":"2011-02-21T00:00:00Z","year":"2011","citation":{"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.","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>","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.","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).","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>."},"date_updated":"2021-01-12T08:11:43Z","abstract":[{"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.","lang":"eng"}],"publication_identifier":{"issn":["0953-8984","1361-648X"]},"day":"21","doi":"10.1088/0953-8984/23/10/105402","status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","extern":"1","volume":23,"issue":"10","author":[{"full_name":"Salje, E K H","first_name":"E K H","last_name":"Salje"},{"full_name":"Safarik, D J","last_name":"Safarik","first_name":"D J"},{"full_name":"Taylor, R D","last_name":"Taylor","first_name":"R D"},{"first_name":"M P","last_name":"Pasternak","full_name":"Pasternak, M P"},{"full_name":"Modic, Kimberly A","orcid":"0000-0001-9760-3147","last_name":"Modic","first_name":"Kimberly A","id":"13C26AC0-EB69-11E9-87C6-5F3BE6697425"},{"full_name":"Groat, L A","last_name":"Groat","first_name":"L A"},{"last_name":"Lashley","first_name":"J C","full_name":"Lashley, J C"}],"publication":"Journal of Physics: Condensed Matter","_id":"7076","article_number":"105402","intvolume":"        23","month":"02","title":"Determination of iron sites and the amount of amorphization in radiation-damaged titanite (CaSiTiO5)","article_processing_charge":"No","date_created":"2019-11-19T13:39:30Z","oa_version":"None","publication_status":"published","language":[{"iso":"eng"}],"quality_controlled":"1","article_type":"original","publisher":"IOP Publishing"}]