The FFLO State in the Dimer Mott Organic Superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br

The superconducting phase diagram for a quasi-two-dimensional organic superconductor, κ-(BEDT-TTF)2Cu[N(CN)2]Br, was studied using pulsed magnetic field penetration depth measurements under rotating magnetic fields. At low temperatures, H</i&...

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Autores principales:	Shusaku Imajo, Koichi Kindo
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	FFLO organic superconductor penetration depth measurement Crystallography QD901-999
Acceso en línea:	https://doaj.org/article/6f72e7af7b9b4aaa81ef80da8ec540d4
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spelling	oai:doaj.org-article:6f72e7af7b9b4aaa81ef80da8ec540d42021-11-25T17:18:48ZThe FFLO State in the Dimer Mott Organic Superconductor κ-(BEDT-TTF)<sub>2</sub>Cu[N(CN)<sub>2</sub>]Br10.3390/cryst111113582073-4352https://doaj.org/article/6f72e7af7b9b4aaa81ef80da8ec540d42021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4352/11/11/1358https://doaj.org/toc/2073-4352The superconducting phase diagram for a quasi-two-dimensional organic superconductor, κ-(BEDT-TTF)<sub>2</sub>Cu[N(CN)<sub>2</sub>]Br, was studied using pulsed magnetic field penetration depth measurements under rotating magnetic fields. At low temperatures, <i>H</i><sub>c2</sub> was abruptly suppressed even by small tilts of the applied fields owing to the orbital pair-breaking effect. In magnetic fields parallel to the conducting plane, the temperature dependence of the upper critical field <i>H</i><sub>c2</sub> exhibited an upturn and exceeded the Pauli limit field <i>H</i><sub>P</sub> in the lower temperature region. Further analyses with the second derivative of the penetration depth showed an anomaly at 31–32 T, which roughly corresponded to <i>H</i><sub>P</sub>. The origin of the anomaly should not be related to the orbital effect, but the paramagnetic effect, which is almost isotropic in organic salts, because it barely depends on the field angle. Based on these results, the observed anomaly is most likely due to the transition between the Bardeen-Cooper-Schrieffer (BCS) and the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states. Additionally, we discuss the phase diagram and physical parameters of the transition by comparing them with other FFLO candidates.Shusaku ImajoKoichi KindoMDPI AGarticleFFLOorganic superconductorpenetration depth measurementCrystallographyQD901-999ENCrystals, Vol 11, Iss 1358, p 1358 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	FFLO organic superconductor penetration depth measurement Crystallography QD901-999
spellingShingle	FFLO organic superconductor penetration depth measurement Crystallography QD901-999 Shusaku Imajo Koichi Kindo The FFLO State in the Dimer Mott Organic Superconductor κ-(BEDT-TTF)<sub>2</sub>Cu[N(CN)<sub>2</sub>]Br
description	The superconducting phase diagram for a quasi-two-dimensional organic superconductor, κ-(BEDT-TTF)<sub>2</sub>Cu[N(CN)<sub>2</sub>]Br, was studied using pulsed magnetic field penetration depth measurements under rotating magnetic fields. At low temperatures, <i>H</i><sub>c2</sub> was abruptly suppressed even by small tilts of the applied fields owing to the orbital pair-breaking effect. In magnetic fields parallel to the conducting plane, the temperature dependence of the upper critical field <i>H</i><sub>c2</sub> exhibited an upturn and exceeded the Pauli limit field <i>H</i><sub>P</sub> in the lower temperature region. Further analyses with the second derivative of the penetration depth showed an anomaly at 31–32 T, which roughly corresponded to <i>H</i><sub>P</sub>. The origin of the anomaly should not be related to the orbital effect, but the paramagnetic effect, which is almost isotropic in organic salts, because it barely depends on the field angle. Based on these results, the observed anomaly is most likely due to the transition between the Bardeen-Cooper-Schrieffer (BCS) and the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states. Additionally, we discuss the phase diagram and physical parameters of the transition by comparing them with other FFLO candidates.
format	article
author	Shusaku Imajo Koichi Kindo
author_facet	Shusaku Imajo Koichi Kindo
author_sort	Shusaku Imajo
title	The FFLO State in the Dimer Mott Organic Superconductor κ-(BEDT-TTF)<sub>2</sub>Cu[N(CN)<sub>2</sub>]Br
title_short	The FFLO State in the Dimer Mott Organic Superconductor κ-(BEDT-TTF)<sub>2</sub>Cu[N(CN)<sub>2</sub>]Br
title_full	The FFLO State in the Dimer Mott Organic Superconductor κ-(BEDT-TTF)<sub>2</sub>Cu[N(CN)<sub>2</sub>]Br
title_fullStr	The FFLO State in the Dimer Mott Organic Superconductor κ-(BEDT-TTF)<sub>2</sub>Cu[N(CN)<sub>2</sub>]Br
title_full_unstemmed	The FFLO State in the Dimer Mott Organic Superconductor κ-(BEDT-TTF)<sub>2</sub>Cu[N(CN)<sub>2</sub>]Br
title_sort	fflo state in the dimer mott organic superconductor κ-(bedt-ttf)<sub>2</sub>cu[n(cn)<sub>2</sub>]br
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/6f72e7af7b9b4aaa81ef80da8ec540d4
work_keys_str_mv	AT shusakuimajo thefflostateinthedimermottorganicsuperconductorkbedtttfsub2subcuncnsub2subbr AT koichikindo thefflostateinthedimermottorganicsuperconductorkbedtttfsub2subcuncnsub2subbr AT shusakuimajo fflostateinthedimermottorganicsuperconductorkbedtttfsub2subcuncnsub2subbr AT koichikindo fflostateinthedimermottorganicsuperconductorkbedtttfsub2subcuncnsub2subbr
_version_	1718412536950292480

The FFLO State in the Dimer Mott Organic Superconductor κ-(BEDT-TTF)<sub>2</sub>Cu[N(CN)<sub>2</sub>]Br

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