High-field phase in the magnetic-field-induced electronic phase transition of graphite

Ochimizu, Hideaki; Takamasu, T.; Takeyama, S.; Sasaki, Susumu; Miura, N.

doi:10.1103/physrevb.46.1986

Cited by 35 publications

(22 citation statements)

References 11 publications

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“…On the other hand, the critical field of the α ′ transition show rather weak temperature dependence as reported previously. 11 Meanwhile, the other anomaly seen between α and α ′ pointed out in the previous reports 11,13 (which The inset shows the differential magnetization in the low field region.…”

Section: Methodssupporting

confidence: 53%

Possible Excitonic Phase of Graphite in the Quantum Limit State

et al. 2015

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The in-plane resistivity, Hall resistivity and magnetization of graphite were investigated in pulsed magnetic fields applied along the c-axis. The Hall resistivity approaches zero at around 53 T where the in-plane and out-of-plane resistivities steeply decrease. The differential magnetization also shows an anomaly at around this field with a similar amplitude compared to that of de Haas-van Alphen oscillations at lower fields. This transition field appears insensitive to disorder, but reduces with doping holes. These results suggest the realization of the quantum limit states above 53 T. As a plausible explanation for the observed gapped out-ofplane conduction above 53 T, the emergence of the excitonic BCS-like state in graphite is proposed.

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Section: Methodssupporting

confidence: 53%

Possible Excitonic Phase of Graphite in the Quantum Limit State

et al. 2015

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“…This scenario and its variants remain the one most commonly invoked to explain this transition.The magnitude of the field necessary to induce the transition (≥ 25 T) is beyond what can be obtained by commercially available magnets. Therefore, experimental studies of this transition have been scarce and limited to resistivity measurements [9][10][11][12][13][14][15]. They have uncovered the destruction of the field-induced state at still higher fields [12].…”

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confidence: 99%

Nernst Response of the Landau Tubes in Graphite across the Quantum Limit

et al. 2011

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We report on a study of the Nernst effect in graphite extended up to 45 T. The Nernst response sharply peaks when a Landau tube is squeezed inside the thermally fuzzy Fermi surface and presents a temperature-independent fixed point when the tube flattens to a single ring. Beyond the quantum limit, the onset of the field-induced phase transition leads to a drastic drop in the Nernst response signaling the sudden vanishing of Landau tubes. The magnitude of this drop suggests the destruction of multiple Landau tubes possibly as a result of simultaneous nesting of the electron and hole pockets.PACS numbers: 71.70. Di, 72.15.Gd Manifestations of electron-electron interaction in graphene are a current subject of intense attention [1][2][3]. Meanwhile, in a macroscopic stack of graphene layers, a phase transition induced by strong magnetic field was discovered three decades ago [4,5] and is believed to be driven by Coulomb interaction [6]. A large magnetic field applied perpendicular to the conducting planes of graphite confines both electrons and holes of the semimetal to their lowest Landau levels. A variety of instabilities can occur in a three-dimensional electron gas in such a context [7]. A Charge-Density-Wave (CDW) transition resulting from the 2k F nesting is the one which was proposed by Yoshioka and Fukuyama(YF)[8] to explain the field-induced phase transition in graphite. This scenario and its variants remain the one most commonly invoked to explain this transition.The magnitude of the field necessary to induce the transition (≥ 25 T) is beyond what can be obtained by commercially available magnets. Therefore, experimental studies of this transition have been scarce and limited to resistivity measurements [9][10][11][12][13][14][15]. They have uncovered the destruction of the field-induced state at still higher fields [12]. The existence of such a reentrant transition, believed to occur when an additional Landau sub-level is depopulated, is in agreement with the YF scenario. The magnitude of the reentrant field (∼ 53 T) implies significant many-body corrections to the single-particle spectrum [16]. On the other hand, a number of experimental findings do not easily fit the YF picture. Observation of nonlinear in-plane conductivity implies a CDW vector with an in-plane component, in contrast to what is expected in the simplest nesting scenario [17]. Moreover, the structure of the phase transition appears to be complex with several transitions giving rise to different signatures in the in-plane and out-of-plane charge transport [14,15].Recent experimental studies [18,19] have found that the Nernst effect is a sensitive probe of the threedimensional electron gas in the vicinity of the quantum limit. According to a recent theoretical investigation [20] the van Hove singularity in the density of states at the intersection of a Landau level and a Fermi level leads to a particularly sharp peak in the transverse thermoelectric response. Fundamentally, since the Nernst response monitors the density of states per ca...

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“…It has been known for a long time that magnetic field B > 20 T applied along the hexagonal c-axis induces in graphite an anomalous high-resistance state (HRS) that can be detected using either basal-plane ρ b (B,T) or out-of-plane ρ c (B,T) resistivity measurements [1][2][3][4][5][6][7][8][9] [20 T >> B QL = 7 -8 T(QL stands for quantum limit) that pulls all carriers into the lowest Landau level (LLL)]. The boundaries that trace the HRS domain on the B-T plane [5,7] are in a qualitative agreement with theoretical expectations [10] for the Landau-level-quantizationinduced normal metal -charge density wave (CDW) as well as the reentrant CDW-normal metal transitions. However, while the CDW is predicted to occur in the direction of the magnetic field [10], the experimental results [2,4] indicate the in-plane character of CDW, or formation of twodimensional (2D) Wigner crystal (WC) state(s) [11,12].…”

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confidence: 99%

Searching for the Fractional Quantum Hall Effect in Graphite

et al. 2009

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Measurements of basal plane longitudinal ρ b (B) and Hall ρ H (B) resistivities were performed on highly oriented pyrolytic graphite (HOPG) samples in pulsed magnetic field up to B = 50 T applied perpendicular to graphene planes, and temperatures 1.5 K ≤ T ≤ 4.2 K. At B > 30 T and for all studied samples, we observed a sign change in ρ H (B) from electron-to holelike. For our best quality sample, the measurements revealed the enhancement in ρ b (B) for B > 34 T (T = 1.8 K), presumably associated with the field-driven charge density wave or Wigner crystallization transition. Besides, well defined plateaus in ρ H (B) were detected in the ultraquantum limit revealing the signatures of fractional quantum Hall effect in graphite.

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High-field phase in the magnetic-field-induced electronic phase transition of graphite

Cited by 35 publications

References 11 publications

Possible Excitonic Phase of Graphite in the Quantum Limit State

Possible Excitonic Phase of Graphite in the Quantum Limit State

Nernst Response of the Landau Tubes in Graphite across the Quantum Limit

Searching for the Fractional Quantum Hall Effect in Graphite

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