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Mj, Naughton; Oh, C. W. W.; Chaparala, M.; Bu, Xia; Coppens, P.

doi:10.1103/physrevlett.67.3712

Cited by 120 publications

(81 citation statements)

References 15 publications

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“…The MA effects are also seen in torque measurements, as measured by Naughton et al 12 This has been discussed theoretically by Yakovenko. 29 Since the torque can be related to the free energy, it is likely that MA effects reflects the ground state electronic properties of the material.…”

Section: Introductionsupporting

confidence: 56%

“…1. This is justified by the fact that the experiment we compare with is performed for the ClO 4 compound and the oscillations in the y -z plane are not as visible 12 as for the PF 6 compound indicating a smaller incoherence factor. note that is a function of B z .…”

Section: B ᠬ In the "X Z… Planementioning

confidence: 93%

“…9, 10 Lebed 11 predicted that resistance maxima would occur when orbits along directions in the crystal are commensurate with the applied field at the so-called "magic angles" (MA) where tan = lb / c, where is the angle between the magnetic field, tilted in the ͑y , z͒ plane, and the least conducting direction, z, b, and c are lattice constants, and l is an integer. The MA were later discovered, 12 but not as maxima but as dips in the angular dependence of the magnetoresistance. MA effects are also seen 13 in the ͑DMET-TSeF͒ 2 X family where X = AuCl 2 , AuI 2 .…”

Section: Introductionmentioning

confidence: 99%

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Magic-angle effects in the interlayer magnetoresistance of quasi-one-dimensional metals due to interchain incoherence

Lundin

McKenzie

2004

Phys. Rev. B

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The dependence of the magnetoresistance of quasi-one-dimensional metals on the direction of the magnetic field show dips when the field is tilted at the so-called magic angles determined by the structural dimensions of the materials. There is currently no accepted explanation for these magic-angle effects. We present a possible explanation. Our model is based on the assumption that, the intralayer transport in the second most conducting direction has a small contribution from incoherent electrons. This incoherence is modeled by a small uncertainty in momentum perpendicular to the most conducting (chain) direction. Our model predicts the magic angles seen in interlayer transport measurements for different orientations of the field. We compare our results to predictions by other models and to experiment.

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Section: Introductionsupporting

confidence: 56%

Section: B ᠬ In the "X Z… Planementioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Magic-angle effects in the interlayer magnetoresistance of quasi-one-dimensional metals due to interchain incoherence

Lundin

McKenzie

2004

Phys. Rev. B

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“…These materials are quasi-one-dimensional (Q1D) organic conductors with transfer integrals of order 250, 25, and 0.25 meV for the a, b, and c axis directions respectively. In the SC state, evidence for p-wave pairing exists since the critical field H c2 exceeds the Pauli limit when the field is aligned parallel to the molecular planes [8,9] [12,13]. Here the field is aligned along crystal planes composed of the a-axis and integer combinations of the b and c unit cell parameters.…”

Section: Introductionmentioning

confidence: 99%

Resonant Nernst Effect in the Metallic and Field-Induced Spin Density Wave States of(TMTSF)2ClO4

et al. 2005

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We examine an unusual phenomenon where, in tilted magnetic fields near magic angles parallel to crystallographic planes, a "giant" resonant Nernst signal has been observed by Wu et al.[Phys. Rev. Lett. 91 56601(2003)] in the metallic state of an organic conducting Bechgaard salt. We show that this effect appears to be a general feature of these materials, and is also present in the field induced spin density wave phase with even larger amplitude. Our results place new restrictions on models that treat the metallic state as an unconventional density wave or as a state with finite Cooper pairing.PACS Numbers (72.15.Jf, 72.15.Gd, 75.30.Fv) 2 The Bechgaard salts, (TMTSF) 2 X (X=PF 6 , ClO 4 , AsF 6 , ReO 4 ,…) continue to attract attention due to the proximity of novel ground states including antiferromagnetic spin density waves (SDW), unconventional superconducting (SC) and metallic states, and magnetic field induced spin density wave (FISDW) states [1,2]. Recently, arguments have been made for the coexistence of the SDW, SC, and metallic states along phase boundaries [3][4][5], for the possibility that the metallic state is an unconventional SDW phase [6], and even for the survival of p-wave Cooper pairing in the metallic state [7].Most studied are (TMTSF) 2 PF 6 (under pressure to remove the ambient pressure SDW phase) and (TMTSF) 2 ClO 4 . These materials are quasi-one-dimensional (Q1D) organic conductors with transfer integrals of order 250, 25, and 0.25 meV for the a, b, and c axis directions respectively. In the SC state, evidence for p-wave pairing exists since the critical field H c2 exceeds the Pauli limit when the field is aligned parallel to the molecular planes [8,9] [12,13]. Here the field is aligned along crystal planes composed of the a-axis and integer combinations of the b and c unit cell parameters. Above a threshold field H th , the FISDW state (with a cascade of subphases) is stabilized due to the quantized nesting of the Q1D Fermi surface [1,15]. Unlike the tan(θ) dependence, the threshold and subphases in the FISDW phase are driven by the field component perpendicular to the conducting ab planes, i.e. the "cosine law" H ⊥ =H cos(θ).In this Letter we examine the longitudinal (Seebeck or TEP) and transverse (Nernst) thermoelectric effects in the metallic and FISDW phases in (TMTSF) 2 ClO 4 (hereafter ClO 4 ). The Nernst effect, an analogue of the Hall effect, is the transverse voltage induced by a temperature gradient in a magnetic field. It has been studied in cuprates due to its sensitivity to the vortex state, where large Nernst signal can be induced by phase slip 3 [16,17]. On the other hand, quasi particles in normal Fermi liquids with one type of charge carriers are known to generate very small Nernst effect because of so called the "Sondheimer cancellation" [18,19]. When more than two types of carriers are involved, the cancellation is not perfect and the Nernst effect can be finite with an order of (e/k B )(T/T F )(ω c τ) where k B T F is the Fermi energy, ω c is the cyclotron...

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“…Several related types of so-called angular magnetoresistance oscillations (AMRO) have been observed in these Q1D conductors, as well as in quasi-two-dimensional ones [1][2][3]. In Q1D, when the magnetic field is rotated about the orthogonal axes, a//x, b'//y and c * //z, seemingly different kinds of AMRO are observed, to wit: Lebed magic angle (LMA) resonances [4,5,6,7,8] for field rotated in the plane perpendicular to the one-dimensional chains (i.e. about…”

Section: Introductionmentioning

confidence: 99%

Multidimensional nature of molecular organic conductors revealed by angular magnetoresistance oscillations

Dhakal

Yoshino

et al. 2012

Synthetic Metals

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Angle-dependent magnetoresistance experiments on organic conductors exhibit a wide range of angular oscillations associated with the dimensionality and symmetry of the crystal structure and electron energy dispersion. In particular, characteristics associated with 1, 2, and 3-dimensional electronic motion are separately revealed when a sample is rotated through different crystal planes in a magnetic field. Originally discovered in the TMTSF-based conductors, these effects are particularly pronounced in the related system (DMET) 2 I 3 . Here, experimental and computational results for magnetoresistance oscillations in this material, over a wide range of magnetic field orientations, are presented in such a manner as to uniquely highlight this multidimensional behavior. The calculations employ the Boltzmann transport equation that incorporates the system's triclinic crystal structure, which allows for accurate estimates of the transfer integrals along the crystallographic axes, verifying the 1D, 2D and 3 D nature of (DMET) 2 I 3 , as well as crossovers between dimensions in the electronic behavior.

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Commensurate fine structure in angular-dependent studies of (TMTSF)2ClO4

Cited by 120 publications

References 15 publications

Magic-angle effects in the interlayer magnetoresistance of quasi-one-dimensional metals due to interchain incoherence

Magic-angle effects in the interlayer magnetoresistance of quasi-one-dimensional metals due to interchain incoherence

Resonant Nernst Effect in the Metallic and Field-Induced Spin Density Wave States of(TMTSF)2ClO4

Multidimensional nature of molecular organic conductors revealed by angular magnetoresistance oscillations

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