Time-dependent specific heat below 1 K in the spin-density-wave state of (TMTSF<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">PF</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Lasjaunias, J.C.; Biljaković, Katica; Monçeau, P.

doi:10.1103/physrevb.53.7699

Cited by 37 publications

(26 citation statements)

References 18 publications

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“…It has been proposed that the SDW state of ͑TMTSF͒ 2 PF 6 is divided into three subphases: SDW1 between 12 and 3.5 K, SDW2 between 3.5 and 2 K, and SDW3 below 2 K. 31 In NMR studies, 31,32 two anomalies of T 1 −1 were found at about 3.5 and 2 K besides the SDW transition temperature of 12 K. The corresponding anomalies were observed by heat capacity, 33,34 dielectric constant, 33,35 magnetic susceptibility, 36 and magnetotransport. 37 Recently, Kagoshima et al 12 reported by x-ray measurement that the superlattice reflections due to 2k F and 4k F CDWs disappeared below 3-4 K. They stated that the SDW1 and SDW2 subphases are the coexistent SDW-CDW state, but the amplitude of CDW is very small in the SDW2 subphase.…”

Section: Discussionmentioning

confidence: 96%

Sliding spin-density wave in(TMTSF)2PF6studied with narrow-band noise

et al. 2004

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We report narrow-band noise (NBN) due to sliding motions of the spin-density wave (SDW) condensate at 2.0 K in three samples of ͑TMTSF͒ 2 PF 6 and the magnetic-field effects. Typical NBN spectra coming from the saw-toothed-wave current oscillations are clearly observed. The periodic peaks due to the 4k F -charge-density wave (CDW) collective excitation are found, together with the SDW moving with a faster velocity, revealing that the sliding mode of the SDW is coupled with 4k F -CDW fluctuations. Observation of the interference peaks gives evidence of spatially nonuniform dc current carried by the deformable SDW in domains. At large currents the NBN spectrum drastically changes with increasing current and depends on applied magnetic field, suggesting a dynamical phase transition from the plastic-flow phase to the moving-solid phase. In the movingsolid phase the frequencies of the periodic peaks decrease with increasing current because the spatial coherency grows rapidly. The current oscillations in this phase are interpreted in terms of the coexistence of the 2k F -CDW collective excitation with the phason.

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Section: Discussionmentioning

confidence: 96%

Sliding spin-density wave in(TMTSF)2PF6studied with narrow-band noise

et al. 2004

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“…From previous investigations it is known that in insulating magnetic crystals (e.g., the spin ice compound Dy 2 Ti 2 O 7 37 and several low-dimensional quantum magnets 38 ), the slow relaxation of low-energy excitations can introduce some dependence of the measured specific heat on extrinsic parameters, such as, the measurement duration, thermal anchoring of the sample, applied magnetic field, etc. 38,39 . A combination of these factors might be related to the observed orientation dependence of specific heat at low-temperatures.…”

Section: B Magnetic Ordering Temperature Of the Doped Chainsmentioning

confidence: 99%

Impurities in the weakly coupled quantum spin chains Sr2CuO3 and SrCuO2

et al. 2017

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We study the effect of non-magnetic Zn 2+ (spin-0) and magnetic Ni 2+ (spin-1) impurities on the ground state and low-lying excitations of the quasi-one-dimensional spin-1/2 Heisenberg antiferromagnet Sr2CuO3 using inelastic neutron scattering, specific heat and bulk magnetization measurements. We show that 1 % Ni 2+ doping in Sr2CuO3 results in a sizable spin gap in the spinon excitations, analogous to the case of Ni doped SrCuO2 previously reported [ref. 1]. However, a similar level of Zn 2+ doping in SrCuO2, investigated here for comparison, did not reveal any signs of a spin gap. Magnetic ordering temperature was found to be suppressed in the presence of both Zn 2+ and Ni 2+ impurities, however, the rate of suppression due to Ni 2+ was found to be much more pronounced than for Zn 2+ . Effect of magnetic field on the ordering temperature is investigated. We found that with increasing magnetic field, not only the magnetic ordering temperature gradually increases but the size of specific heat anomaly associated with the magnetic ordering also progressively enhances, which can be qualitatively understood as due to the field induced suppression of quantum fluctuations.

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“…Consequently, we disregard this contribution (and any other from low-energy charge-carrying excitations 20 ). In solids states with three translational and three rotational degrees of freedom, the specific heat contribution from acoustic phonons can be calculated by the Debye model 21 :…”

Section: A Nonlinear Current-voltage Characteristicsmentioning

confidence: 99%

Energy exchange between phononic and electronic subsystems governing the nonlinear conduction inDCNQI2Cu

et al. 2015

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We present a dynamical study on the nonlinear conduction behaviour in the commensurate charge-density-wave phase of the quasi-one-dimensional conductor DCNQI 2 Cu below 75 K. We can accurately simulate magnitude and time-dependence of the measured conductivity in response to large voltage pulses by accounting for the energy exchange between the phononic and electronic subsystems by means of an electrothermal model. Our simulations reveal a distinct non-equilibrium population of optical phonon states with an average energy of E ph = 19 meV being half the activation energy of about ∆E a = 39 meV observed in DC resistivity measurements. By inelastic scattering, this hot optical phonon bath generates additional charge-carrying excitations thus providing a multiplication effect while energy transferred to the acoustic phonons is dissipated out of the system via heat conduction. Therefore, in high electric fields a preferred interaction of chargecarrying excitations with optical phonons compared to acoustic phonon modes is considered to be responsible for the nonlinear conduction effects observed in DCNQI 2 Cu.

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Time-dependent specific heat below 1 K in the spin-density-wave state of (TMTSF)2PF6

Cited by 37 publications

References 18 publications

Sliding spin-density wave in(TMTSF)2PF6studied with narrow-band noise

Sliding spin-density wave in(TMTSF)2PF6studied with narrow-band noise

Impurities in the weakly coupled quantum spin chains Sr2CuO3 and SrCuO2

Energy exchange between phononic and electronic subsystems governing the nonlinear conduction inDCNQI2Cu

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