Superconductivity in an Organic Insulator at Very High Magnetic Fields

Balicas, Luis; Brooks, J. S.; Storr, K.; Uji, S.; Tokumoto, M.; Tanaka, Hidemi; Kobayashi, Hayao; Kobayashi, Akiko; Barzykin, Victor; Gor’kov, L. P.

doi:10.1103/physrevlett.87.067002

Cited by 213 publications

(152 citation statements)

References 14 publications

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“…Thus from the data T0 = 5 K, φ1 = 90°, and φ2 = 0° as shown from T is calculated with H0 = 9.0006 T. With these values we obtained H π d = (-32.7 ± 1.5) T at temperature T = 5 K and applied field H0 = 9 T. This is very close to the expected value of −33 T obtained from the electrical resistivity measurement [27,28] and the theoretical estimate [29].…”

supporting

confidence: 85%

Field-Induced Superconductors: NMR Studies of λ–(BETS)2FeCl4

Wu¹,

Clark²

2012

Superconductors - Materials, Properties and Applications

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supporting

confidence: 85%

Field-Induced Superconductors: NMR Studies of λ–(BETS)2FeCl4

Wu¹,

Clark²

2012

Superconductors - Materials, Properties and Applications

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“…However, the upwards convex nature of the lower critical field as a function of the temperature casts doubts on this interpretation. Therefore some authors, e.g., Balicas et al (2001), have proposed that these results can be interpreted as evidence of the formation of the LOFF state. These results were reviewed by Houzet et al (2002) and Shimahara (2002).…”

Section: Two-dimensional Quasi-two-dimensional and Organic Supermentioning

confidence: 99%

Inhomogeneous superconductivity in condensed matter and QCD

2004

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Inhomogeneous superconductivity arises when the species participating in the pairing phenomenon have different Fermi surfaces with a large enough separation. In these conditions it could be more favorable for each of the pairing fermions to stay close to its Fermi surface and, unlike the usual BCS state, for the Cooper pair to have a nonzero total momentum. For this reason, in this state the gap varies in space, the ground state is inhomogeneous, and a crystalline structure might be formed. This situation was considered for the first time by Fulde and Ferrell (1964) and Larkin and Ovchinnikov (1964), after whom the corresponding state is called the LOFF state. The spontaneous breaking of the space symmetries in the vacuum state is a characteristic feature of this phase and is associated with the presence of long-wavelength excitations of zero mass. The situation described here is of interest both in solid-state and in elementary-particle physics, in particular in quantum chromodynamics at high density and low temperature. This review presents the theoretical approach to the LOFF state and its phenomenological applications using the language of the effective field theories. CONTENTS

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“…Thus they could be strong candidates to look for the FFLO state. Actually, in the past decade, indications for possible FFLO state have been reported in the heavy fermion materials CeCoIn 5 [5,6], organic superconductors λ-(BETS) 2 GaCl 4 [7],λ-(BETS) 2 FeCl 4 [8,9] and κ-(BEDT-TTF) 2 Cu(NCS) 2 [10,11]. All of them are quasi two dimensional (2D) layered compounds.…”

mentioning

confidence: 99%

Phase diagram and local tunneling spectroscopy of the Fulde-Ferrell-Larkin-Ovchinnikov states of a two-dimensional square-latticed-wave superconductor

Zhou

Ting

2009

Phys. Rev. B

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We studied the phase diagram for a two-dimensional d-wave superconducting system under an in-plane magnetic field or an exchange field. According to the spatial configuration of the order parameter, we show that there exists quantum phase transitions in which the uniform phase transforms to the one-dimensional Fulde-FerrellLarkin-Ovchinnikov (FFLO) state, and then to two-dimensional FFLO state upon increasing the exchange field. The local density of states are calculated and suggested to be signatures to distinguish these phases.The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state was predicted several decades ago by Fulde and Ferrell [1], and Larkin and Ovchinnikov [2] for the superconductor in a strong magnetic field, where the superconducting (SC) order parameter varies periodically in space. While the occurance of the FFLO state requires very stringent conditions on the SC materials, namely, the Pauli paramagnetism effect should dominate over the orbital effect [3], and the material needs to be very clean [4]. As a result, this long thought of inhomogeneous SC state has never been observed in conventional superconductors.For layered systems with an exchange field or a magnetic field parallel to the SC plane, the orbital effect will be suppressed strongly due to the low dimensionality. Thus they could be strong candidates to look for the FFLO state. Actually, in the past decade, indications for possible FFLO state have been reported in the heavy fermion materials CeCoIn 5 [5,6], organic superconductors λ-(BETS) 2 GaCl 4 [7],λ-(BETS) 2 FeCl 4 [8, 9] and κ-(BEDT-TTF) 2 Cu(NCS) 2 [10,11]. All of them are quasi two dimensional (2D) layered compounds. The experimental developments have attracted renewed interest on the property of the FFLO state. Theoretically, the existence and the character of the FFLO state can be investigated through analyzing the Ginzburg-Landau (GL) free-energy function, which is valid at temperatures not too below the superconducting transition temperature. Another effective method is the Bogoliubovde-Gennes (BdG) technique and it has been proven to be a powerful tool to study the inhomogeneous state and the local density of states (LDOS) self-consistently in the lowdimensional system. In fact, in the past, the FFLO state has been studied intensively based on the above two techniques [12,13,14,15,16,17,18]. For a 2D system, it is somewhat established [14,15]that the order parameter has a 2D checkerboard pattern for a superconductor with d-wave pairing symmetry, and a 1D stripe-like pattern for s-wave pairing symmetry [15,16]. On the other hand, it has been shown that in the presence of dilute impurities, the pattern of the FFLO state becomes 1D stripe-like in a 2D d-wave superconductor [17,18]. This implies that the 2D and 1D FFLO states may be present in the system in different parameter region. It was also argued without a calculation that the H −T phase diagram for the 2D isotropic systems, regardless it is s or d-wave pairing, should include both 1D FFLO state and 2D FFLO states with squar...

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Superconductivity in an Organic Insulator at Very High Magnetic Fields

Cited by 213 publications

References 14 publications

Field-Induced Superconductors: NMR Studies of λ–(BETS)2FeCl4

Field-Induced Superconductors: NMR Studies of λ–(BETS)2FeCl4

Inhomogeneous superconductivity in condensed matter and QCD

Phase diagram and local tunneling spectroscopy of the Fulde-Ferrell-Larkin-Ovchinnikov states of a two-dimensional square-latticed-wave superconductor

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