Thermodynamic properties of the spin-Peierls transition in CuGeO3

Weiden, M.; Köhler, J.; Sparn, G.; Köppen, M.; Lang, Michael; Geibel, C.; Steglich, F.

doi:10.1007/bf01324522

Cited by 21 publications

(16 citation statements)

References 13 publications

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“…30 Assuming α=500 cm −1 and α=250 cm −1 in the 1.55 eV-c-polarized and 3.14 eV-bpolarized configurations, 15 we can estimate δT=3.6 K and δT=1.8 K, respectively. While the ratio of the estimated temperature increase (3.6 K/1.8 K≃2), related to the difference in the absorbed density of energy, is compatible with measured ratio (23 K/14 K≃1.6), the discrepancy of the absolute values can be attributed to the fact that the energy absorbed by the electronic transitions is delivered to a subset of optical lattice modes, i.e.…”

Section: Discussionmentioning

confidence: 99%

Disentangling thermal and nonthermal excited states in a charge-transfer insulator by time- and frequency-resolved pump-probe spectroscopy

et al. 2009

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Time-and-frequency resolved pump-probe optical spectroscopy is used to investigate the effect of the impulsive injection of delocalized excitations through a charge-transfer process in insulating CuGeO3. A large broadening of the charge-transfer edge is observed on the sub-ps timescale. The modification of this spectral feature can not be attributed to the local increase of the effective temperature, as a consequence of the energy absorbed by the pump pulse. The measured modifications of the optical properties of the system are consistent with the creation of a non-thermal state, metastable on the ps timescale, after the pump-induced impulsive modification of the electron interactions.

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Section: Discussionmentioning

confidence: 99%

Disentangling thermal and nonthermal excited states in a charge-transfer insulator by time- and frequency-resolved pump-probe spectroscopy

et al. 2009

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“…Experimentally it is still an open question if a spin gap in the incommensurate phase exists. The T 3 contributions to the specific heat at low temperatures [37,38] are explained in terms of gapless "phasons" [39].…”

Section: Perturbations Of the Pure Systemmentioning

confidence: 99%

The spin-1/2 Heisenberg chain: thermodynamics, quantum criticality and spin-Peierls exponents

1998

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We present numerical and analytical results for the thermodynamical properties of the spin-1/2 Heisenberg chain at arbitrary external magnetic field. Special emphasis is placed on logarithmic corrections in the susceptibility and specific heat at very low temperatures (T /J = 10 −24 ) and small fields. A longstanding controversy about the specific heat is resolved. At zero temperature the spin-Peierls exponent is calculated in dependence on the external magnetic field. This describes the energy response of the system to commensurate and incommensurate modulations of the lattice. The exponent for the spin gap in the incommensurate phase is given.

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“…For most of the inorganic substances (in particular for CuGeO 3 ) which have spinspin couplings of the order of 100K, lattice vibrations dominate the specific heat and it is an unsolved problem to extract its magnetic part. As a first approximation 19 it was assumed for CuGeO 3 that it is sufficient to subtract the contribution of the phonons and consider the rest as the contribution of the spins. We show that such an approximation is not justified even in the simple case of dispersionless phonons.…”

Section: B Specific Heat Phonon Occupation Numbermentioning

confidence: 99%

Thermodynamical properties of a spin-12Heisenberg chain coupled to phonons

Kühne

Löw

1999

Phys. Rev. B

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We performed a finite-temperature quantum Monte Carlo simulation of the one-dimensional spin-1 2 Heisenberg model with nearest-neighbor interaction coupled to Einstein phonons. Our method allows to treat easily up to 100 phonons per site and the results presented are practically free from truncation errors. We studied in detail the magnetic susceptibility, the specific heat, the phonon occupation, the dimerization, and the spin-correlation function for various spin-phonon couplings and phonon frequencies. In particular we give evidence for the transition from a gapless to a massive phase by studying the finite-size behavior of the susceptibility. We also show that the dimerization is proportional to g 2 /Ω for T < 2J.

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Thermodynamic properties of the spin-Peierls transition in CuGeO3

Cited by 21 publications

References 13 publications

Disentangling thermal and nonthermal excited states in a charge-transfer insulator by time- and frequency-resolved pump-probe spectroscopy

Disentangling thermal and nonthermal excited states in a charge-transfer insulator by time- and frequency-resolved pump-probe spectroscopy

The spin-1/2 Heisenberg chain: thermodynamics, quantum criticality and spin-Peierls exponents

Thermodynamical properties of a spin-12Heisenberg chain coupled to phonons

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