Muon Spin Relaxation Studies of Unconventional Superconductors: First-Order Behavior and Comparable Spin-Charge Energy Scales

Uemura, Y. J.

doi:10.1007/978-3-662-44133-6_8

Cited by 6 publications

(3 citation statements)

References 105 publications

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“…We add one comment that, in (TMTSF) 2 X, the existence of the quantum critical point is actually not trivial because the boundary between the SDW and SC phases is a first-order phase transition within the pressure-temperature phase diagram, in contrast to ordinary theories on quantum criticality assuming a second-order transition. However, it has been recently revealed that other typical "quantum critical" materials such as iron pnictides [164] indeed exhibit first-order-like behavior in the vicinity of the quantum critical point, evidenced by phase separation between magnetically ordered and paramagnetic phases detected by µSR studies [165]. Thus, it is now getting clearer that the quantum criticality near a first-order transition observed in (TMTSF) 2 X probably shares general and important physics with a broad class of materials.…”

Section: T Tmentioning

confidence: 99%

Novel superconducting phenomena in quasi-one-dimensional Bechgaard salts

Jérôme

Yonezawa

2015

Comptes Rendus. Physique

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It is the saturation of the transition temperature Tc in the range of 24 K for known materials in the late sixties which triggered the search for additional materials offering new coupling mechanisms leading in turn to higher Tc's. As a result of this stimulation, superconductivity in organic matter was discovered in tetramethyl-tetraselenafulvalene-hexafluorophosphate, (TMTSF)2PF6, in 1979, in the laboratory founded at Orsay by Professor Friedel and his colleagues in 1962. Although this conductor is a prototype example for low-dimensional physics, we mostly focus in this article on the superconducting phase of the ambient-pressure superconductor (TMTSF)2ClO4, in which the superconducting phase has been studied most intensively among the TMTSF salts. We shall present a series of experimental results supporting nodal d-wave symmetry for the superconducting gap in these prototypical quasi-one-dimensional conductors.Comment: Review article with 35 pages and 19 figures. Title, text, figures, and references are modified. To be published in Compte Rendu de Physique. Comments are welcom

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Section: T Tmentioning

confidence: 99%

Novel superconducting phenomena in quasi-one-dimensional Bechgaard salts

Jérôme

Yonezawa

2015

Comptes Rendus. Physique

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“…We add one comment that, in (TMTSF) 2 X , the boundary between the SDW and SC phases very close to P c is observed to be weakly first-order [382,383], indicating that the quantumsecond order -critical point within the pressure-temperature phase diagram is actually unstable to first-order effects and the emergence of the superconducting dome. However, it has been recently revealed that other typical "quantum critical" materials such as iron pnictides [384] indeed exhibit a first-order-like-behavior in the vicinity of the quantum critical point, evidenced by phase separation between magnetically ordered and paramagnetic phases detected by µSR studies [385]. Thus, it is now getting clearer that the quantum criticality near a first-order transition observed in (TMTSF) 2 X probably shares general and important physics with a broader class of materials.…”

Section: A Brief Incursion Into Theorymentioning

confidence: 99%

Quasi one-dimensional organic conductors: from Fröhlich conductivity and Peierls insulating state to magnetically-mediated superconductivity, a retrospective

Jerome,

Bourbonnais

2024

Comptes Rendus. Physique

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It is indisputable that the search for high-temperature superconductivity has stimulated the work on low-dimensional organic conductors at its beginning. Since the discovery of true metal-like conduction in molecular compounds more than 50 years ago, it appeared that the chemical composition and the quasi one-dimensional crystalline structure of these conductors were determining factors for their physical properties; materials with incommensurate conduction band filling favoring the low-dimensional electron-phonon diverging channel and the establishment of the Peierls superstructure and more rarely superconductivity at low temperature, while those with commensurate band filling favor either magnetic insulating or superconducting states depending on the intensity of the coupling between conductive chains. In addition, the simple structures of these materials have allowed the development of theoretical models in close cooperation with almost all experimental findings.Even though these materials have not yet given rise to true high-temperature superconductivity, the wealth of their physical properties makes them systems of choice in the field of condensed matter physics due to their original properties and their educational qualities. Research efforts continue in this field. The present retrospective, which does not attempt to be an exhaustive review of the field, provides a set of experimental findings alluding to the theoretical development while a forthcoming article will address in more details the theoretical aspect of low dimensional conductors and superconductors.Résumé. Il est indiscutable que c'est la possibilité d'aboutir à une supraconduction de haute température qui a stimulé le démarrage des recherches sur les conducteurs organiques. Suite à la découverte il y a plus de 50 ans, d'une conduction de type métallique dans des composés moléculaires, il est apparu que la composition chimique, la structure cristalline quasi-unidimensionnelle sont des facteurs qui déterminent les propriétés physiques de ces matériaux ; un remplissage de bande incommensurable favorisant généralement

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“…Muon-spin rotation/relaxation (µSR) is a fast developing and widely used technique which is extremely sensitive to various types of magnetism. [1][2][3][4][5][6][7] Compared to most other microscopic techniques by nuclear probes, a µSR experiment is relatively straightforward since the sample does not need to contain any specific nuclei. In addition, a relatively complicated sample environment can be used as illustrated, e.g.…”

Section: Introductionmentioning

confidence: 99%

Muon spin rotation study of type-I superconductivity: Elemental β -Sn

et al. 2019

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The application of the muon-spin rotation/relaxation (µSR) technique for studying type-I superconductivity is discussed. In the intermediate state, i.e. when a type-I superconducting sample with non-zero demagnetization factor N is separated into normal state and Meissner state (superconducting) domains, the µSR technique allows to determine with very high precision the value of the thermodynamic critical field Bc, as well as the volume of the sample in the normal and the superconducting state. Due to the microscopic nature of µSR technique, the Bc values are determined directly via measurements of the internal field inside the normal state domains. No assumptions or introduction of any type of measurement criteria are needed.Experiments performed on a 'classical' type-I superconductor, a cylindrically shaped β−Sn sample, allowed to reconstruct the full B − T phase diagram. The zero-temperature value of the thermodynamic critical field Bc(0) = 30.578(6) mT and the transition temperature Tc = 3.717(3) K were determined and found to be in a good agreement with the literature data. An experimentally obtained demagnetization factor is in very good agreement with theoretical calculations of the demagnetization factor of a finite cylinder. The analysis of Bc(T ) dependence within the framework of the phenomenological α−model allow to obtain the value of the superconducting energy gap ∆ = 0.59(1) meV, of the electronic specific heat γe = 1.781(3) mJ/mol K 2 and of the jump in the heat capacity ∆C(Tc)/γTc = 1.55(2).

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Muon Spin Relaxation Studies of Unconventional Superconductors: First-Order Behavior and Comparable Spin-Charge Energy Scales

Cited by 6 publications

References 105 publications

Novel superconducting phenomena in quasi-one-dimensional Bechgaard salts

Novel superconducting phenomena in quasi-one-dimensional Bechgaard salts

Quasi one-dimensional organic conductors: from Fröhlich conductivity and Peierls insulating state to magnetically-mediated superconductivity, a retrospective

Muon spin rotation study of type-I superconductivity: Elemental β -Sn

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