/ A. G. Gavriliuk [et al.]> // Europhys. Lett. - 2012. -
Vol. 100,
Is. 4. - Ст. 46005,
DOI 10.1209/0295-5075/100/46005. - Cited References: 26. - This work is supported by DOE (grant No. DE-FG02-02ER45955), by the Russian Foundation for Basic Research (grants 11-02-00291-a, 11-02-00636-a, 12-02-90410_Ukr-a, 12-02-31534-a), by the RAS Program "Strongly correlated electronic systems", by the Russian Ministry of Science (grants 01.164.12.HB11, 16.518.11.7021), Presidium of RAS programs "Quantum physics of condensed matter" project 20.7 and "Matter at high density of energy" project 2.16, FCP Scientific and Research-and-Educational Personnel of Innovative Russia for 2009-2013 (GK 2011-1.3.1-121-018 and GK 16.740.12.0731). Work at UT Austin is supported by Energy Frontier Research in Extreme Environments (EFree) and the Carnegie/DOE Alliance Center (CDAC). SGO and MMK were partially supported by the Leading scientific schools of Russia (NSh 1044-2012.2). MMK acknowledges support from the Dynasty Foundation and ICFPM.
. - ISSN 0295-5075
РУБ Physics, Multidisciplinary
Аннотация: NdFeAsO0.88F0.12 belongs to the recently discovered family of high-T-C iron-based superconductors. We have studied the influence of high pressure on transport properties of this material at low temperatures using the four-probe electrical conductivity technique in a diamond cell. Contrary to La-based compounds, we did not observe a maximum in T-C under pressure. Under compression, T-C drops rapidly as a linear function of pressure with the slope k = -2.8 +/- 0.1 K/GPa. Under decompression, the behavior is completely reversible. The extrapolated value of T-C at zero pressure is about T-C(0) = 51.7 +/- 0.4 K. At pressures higher than similar to 18.4 GPa, the superconducting state disappears at all measured temperatures, although electrical resistance changes slope dramatically and shows a concave behavior. These observations may be related to the Kondo effect or to a weak localization of two-dimensional carriers at high pressures and low temperatures below similar to 45 K, indicating a competition mechanism with the superconducting phase. On the bases of our experimental data, we propose a tentative P-T phase diagram of NdFeAsO0.88F0.12. Copyright (C) EPLA, 2012
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Держатели документа: [Gavriliuk, Alexander G.
Struzhkin, Viktor V.
Yu, Yong] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA
[Gavriliuk, Alexander G.] Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
[Gavriliuk, Alexander G.
Mironovich, Anna A.] Russian Acad Sci, Inst Nucl Res, Moscow 142190, Russia
[Ovchinnikov, Sergey G.
Korshunov, Maxim M.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Ovchinnikov, Sergey G.
Korshunov, Maxim M.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Yu, Yong
Lin, Jung-Fu] Univ Texas Austin, Jackson Sch Geosci, Dept Geol Sci, Austin, TX 78712 USA
[Jin, Changqing] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
Доп.точки доступа: Gavriliuk, A. G.; Struzhkin, V. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Yu, Y.; Korshunov, M. M.; Коршунов, Максим Михайлович; Mironovich, A. A.; Lin, J. F.; Jin, C. Q.