Calorimetric Evidence for a Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in the Layered Organic Superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>κ</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mo stretchy="false">(</mml:mo><mml:mi>BEDT</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mi>TTF</mml:mi><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mn>2</mml:mn></mml:msub><mml:mi>Cu</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:

Lortz, Rolf; Wang, Yi; Demuer, A.; Böttger, P. H. Michael; Bergk, B.; Zwicknagl, Gertrud; Nakazawa, Yasuhiro; Wosnitza, J.

doi:10.1103/physrevlett.99.187002

Cited by 273 publications

(269 citation statements)

References 32 publications

(33 reference statements)

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“…These experimental results are interpreted as evidence for the existence of the FFLO phase. Similar behavior is observed in organic superconductors [14].…”

Section: Summary and Final Remarkssupporting

confidence: 65%

“…in multiband superconductors like IBSC [33][34][35][36] or MgB 2 [37,38]. Specific heat measurements have been also successfully used to investigate the FFLO phase in heavy-fermion systems [7,8,11] and organic superconductors [14], where the peaks, deep in the superconducting state in the LTHM regime, have been interpreted as phase transitions from BCS to FFLO state.…”

Section: Introductionmentioning

confidence: 99%

“…CeCoIn 5 [7][8][9][10][11]) or organic superconductors (e.g. [14][15][16][17][18]). These chemical compounds are often modeled as effectively quasi-2D one-band systems.…”

Section: Introductionmentioning

confidence: 99%

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Multiple phase transitions in Pauli-limited iron-based superconductors

Ptok

2015

J. Phys.: Condens. Matter

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Abstract. Specific heat measurements have been successfully used to probe unconventional superconducting phases in one-band heavy-fermion and organic superconductors. We extend the method to study successive phase transitions in multi-band materials such as iron based superconductors. The signatures are multiple peaks in the specific heat, at low temperatures and high magnetic field, which can lead the experimental verification of unconventional superconducting states with non-zero total momentum.

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“…These experimental results are interpreted as evidence for the existence of the FFLO phase. Similar behavior is observed in organic superconductors [14].…”

Section: Summary and Final Remarkssupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

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Multiple phase transitions in Pauli-limited iron-based superconductors

Ptok

2015

J. Phys.: Condens. Matter

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“…33,34) While a Larkin-Ovchinnikov (LO) state, characterized by the magnitude modulation of the superconducting order parameter, is expected in centrosymmetric superconductors, 35) a Fulde-Ferrell (FF) state, a "helical phase" with an essentially constant order parameter magnitude, 3,[9][10][11][12][13][14][15] could appear in non-centrosymmetric superconductors exposed to a magnetic field. Although experimental indications of the realization of an LO phase have been found for the heavy-fermion superconductor CeCoIn 5 , 36,37) organic superconductors, [38][39][40] ultracold fermion gases with a population imbalance, 41) and nuclear matter, 42) there has been no experimental evidence of the helical phase in non-centrosymmetric superconductors so far. In this paper, we show that a complex-stripe phase, which can be viewed as intermediate between FF and LO states, may exist in locally non-centrosymmetric multilayers.…”

Section: Introductionmentioning

confidence: 99%

Complex-Stripe Phases Induced by Staggered Rashba Spin–Orbit Coupling

2013

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We study superconducting phases in a quasi-two-dimensional multilayer system without local inversion symmetry. Broken local inversion symmetry induces layer-dependent Rashba-type spin-orbit couplings. We find that a complex-stripe phase, which is the intermediate phase between the Fulde-Ferrell (FF) phase and Larkin-Ovchinnikov (LO) phase, is realized in the magnetic field applied parallel to the layers. A crossover from the FF phase to the LO phase appears by tuning temperature and magnetic field. We show the local density of states that characterizes the complex-stripe phase. As a possible realization of the complex-stripe phase, we discuss the artificial superlattices of CeCoIn 5 .

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“…[3][4][5] Following the theoretical prediction of Fulde and Ferrell 1) and Larkin and Ovchinnikov, 2) there has been no convincing experimental evidence of this FFLO state. However, recently, it has been suggested that it occurs in strongly Pauli-limited clean type-II superconductors, such as the heavy-fermion superconductor CeCoIn 5 4) and the quasi-low-dimensional organic superconductors κ-(BEDT-TTF) 2 Cu(NCS) 2 , [10][11][12][13] λ-(BETS) 2 FeCl 4 , [16][17][18] λ-(BETS) 2 GaCl 4 , 19) and (TMTSF) 2 ClO 4 . [20][21][22][23][24][25][26][27] Quasi-low-dimensionality is a common feature of the above-mentioned compounds.…”

Section: Introductionmentioning

confidence: 99%

Dimensional Crossover of the Fulde–Ferrell–Larkin–Ovchinnikov State in Strongly Pauli-Limited Quasi-One-Dimensional Superconductors

Miyawaki

Seki

2014

J. Phys. Soc. Jpn.

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The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is examined in quasi-one-dimensional s-wave and d-wave superconductors with particular attention paid to the effect of the Fermi-surface anisotropy. The upper critical field H c2 (T ) is found to exhibit a qualitatively different behavior depending on the ratio of the hopping energies t b /t a and the direction of the FFLO modulation vector q, where t a and t b are the intra-and interchain hopping energies, respectively. In particular, when t b /t a < ∼ 0.1 and q a, we find a novel dimensional crossover of H c2 (T ) from one dimension to two dimensions, where a is the lattice vector of the most conductive chain. Just below the tricritical temperature T * , the upper critical field H c2 (T ) increases steeply as in one-dimensional systems, but when the temperature decreases, the rate of increase in H c2 (T ) diminishes and a shoulder appears. Near T = 0, H c2 (T ) shows a behavior typical of the FFLO state in two-dimensional systems, i.e., an upturn with a finite field at T = 0. When the angle between q and a is large, the upper critical field curve is convex upward at low temperatures, as in three-dimensional systems, but the magnitude is much larger than that of a three-dimensional isotropic system. For t b /t a > ∼ 0.15, the upper critical fields exhibit a two-dimensional behavior, except for a slight shoulder in the range of 0.2 > ∼ t b /t a > ∼ 0.15. The upper critical field is maximum for q a both for s-wave and d-wave pairings, while it is only slightly larger than the Pauli paramagnetic limit for q ⊥ a. The relevance of the present results to the organic superconductor (TMTSF) 2 ClO 4 is discussed.

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Calorimetric Evidence for a Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in the Layered Organic Superconductorκ−(BEDT−TTF)2Cu(

Cited by 273 publications

References 32 publications

Multiple phase transitions in Pauli-limited iron-based superconductors

Multiple phase transitions in Pauli-limited iron-based superconductors

Complex-Stripe Phases Induced by Staggered Rashba Spin–Orbit Coupling

Dimensional Crossover of the Fulde–Ferrell–Larkin–Ovchinnikov State in Strongly Pauli-Limited Quasi-One-Dimensional Superconductors

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