High field phase transition in (TMTSF)2PF6 under pressure

Azevedo, L. J.; Schirber, J. E.; Greene, R. L.; Engler, E. M.

doi:10.1016/0378-4363(81)90892-5

Cited by 27 publications

(12 citation statements)

References 5 publications

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“…The R-state phase diagram derived from NMR data with H f c. is shown in figure 5b. The transition temperature and the magnetic field orientation dependence agree fairly well with a large number of other experimental results showing the onset of a fieldinduced phase transition : magnetoresistance oscillations [7,8], specific heat [9], 1 H-relaxation rate [10], Hall effect [11]. We suggest that the phase transition detected by 77Se NMR is indeed the same as observed by other methods.…”

Section: Turessupporting

confidence: 89%

An NMR study of the organic superconductor : (TMTSF)2ClO4

1984

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2014 Nous présentons les résultats de mesures RMN etTectuées sur des monocristaux de (TMTSF)2ClO4. Ces résultats prouvent le caractère magnétique de l'état fondamental semi-métallique stabilisé par un champ magnétique élevé. Un état fondamental magnétique peut aussi être stabilisé par la présence d'un désordre moléculaire non magnétique en l'absence de tout champ magnétique appliqué. Le taux de relaxation spin-réseau ne suit pas une loi de Korringa à basse température. De plus, la forte augmentation du taux de relaxation observée au-dessous de 12 K peut être reliée soit à l'existence d'une instabilité onde de densité de spin (lorsqu'elle existe) soit à l'apparition de fluctuations d'un ordre supraconducteur à courte portée. Abstract 2014 We report 1H and 77Se-NMR data on oriented single crystals which establish the magnetic character of the semi-metallic ground state stabilized under high magnetic field in (TMTSF)2ClO4. A similar magnetic state can be stabilized at low temperature in the absence of magnetic field by non-magnetic molecular disorder. At low temperature the spin-lattice relaxation rate does not follow the Korringa law. A large enhancement of the relaxation rate occurring below ~ 12 K may be related to the onset of the SDW instability (whenever it exists) or to the development of short range superconducting fluctuations.

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Section: Turessupporting

confidence: 89%

An NMR study of the organic superconductor : (TMTSF)2ClO4

1984

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“…The observed anisotropy of the effect is an even more serious difficulty to deal with in this scheme. It seems that the relevant quantity in these experiments is the component of the field parallel to c* [19]. While this is expected in Shubnikov-de Haas experiments, since the closed orbits lie in the (a, b) plane, this is more difficult to understand for TSDw(H).…”

Section: Introductionmentioning

confidence: 86%

Spin effects in quasi-one-dimensional conductors under magnetic field

1984

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2014 Nous étudions l'effet du champ magnétique sur la stabilité relative des phases onde de densité de spin, onde de densité de charge, métallique ou supraconductrice dans les métaux quasiunidimensionnels. Nous commençons par traiter le cas du gaz d'électrons unidimensionnel (modèle de g-ologie) par une méthode de groupe de renormalisation multiplicative à deux fréquences de coupure. Les couplages tridimensionnels sont ensuite schématisés par le découplage des canaux « Cooper » et « zero son » qui interfèrent à une dimension. Pour certaines valeurs des interactions et en négligeant les effets diamagnétiques, nous avons trouvé qu'une phase « onde de densité de spin » est stabilisée par le champ. Nous discutons le cas des composés (TMTSF)2X.

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“…We remark that the reduced Fermi wave vector η given by (8) and (9) varies periodically between O and 1 on varying the field. For subsequent use we also compute here the density of states per energy at one of the Fermi "surface" ends, and per spin which also varies periodically with the magnetic field.…”

Section: E I T I S S L I G H T L Y B E L O W T H E F E R M I L mentioning

confidence: 93%

“…Since the bands are very narrow, we may approximate ΔE by t c (1 -cos πη) for 0 < η < 1/2 (electron conduction) and tc(1 + cos πη) for 1/2 < η < 1 (hole conduction). We obtain finally where the reduced Fermi wave vector η is given by (8) and (9) and λ0 = 2πΦ0tcd/λ.…”

Section: Field-induced Sdwmentioning

confidence: 99%

“…It includes Shubnikov-de Haas oscillations in the magnetoresistance [7], NMR magnetization [8], Hall-type effect [9,10], and field-dependent anomalies in the electronic specific heat [11]. The information gathered from such pieces of evidence has led to the suggestion that closed electronic orbits may exist in the α*, b*-plane in the presence of the magnetic field, and that a SDW may survive (providing the pressure is not very high) below 10 K and for certain values of the magnetic field above a threshold value of ~ 2-3 T.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On a Field-Induced Spin-Density Wave in Bechgaard Salts

Apostoł

1994

Acta Phys. Pol. A

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A new t ype of f i el d-i nduced s pi n-dens i t y wave i s s hown t o occur i n a weak-coupling layered model which may be relevant for the highly anisotropic electronic structure of the Bechgaard salts. The modulation vector of this instability is perpendicular to the layers and close to the direction of the magnetic field applied perpendicular to the reciprocal layers. The magnitude of the modulation vector, order parameter and critical temperature have an oscillatory dependence on the magnitude of the magnetic field.

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High field phase transition in (TMTSF)2PF6 under pressure

Cited by 27 publications

References 5 publications

An NMR study of the organic superconductor : (TMTSF)2ClO4

An NMR study of the organic superconductor : (TMTSF)2ClO4

Spin effects in quasi-one-dimensional conductors under magnetic field

On a Field-Induced Spin-Density Wave in Bechgaard Salts

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