Directional phase instability on a cubic compressible lattice near a second-order phase transition with a three-component order parameter

Murata, Kenneth K.

doi:10.1103/physrevb.15.4328

Cited by 22 publications

(2 citation statements)

References 12 publications

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“…We have also investigated, whether there is a finite hysteresis of H C by measuring ǫ i (H) with increasing and decreasing H. For a drift rate of ±0.1 T/min we obtain a difference H a second-order one with a weak first-order contribution. The first-order contribution most probably arises from the large spin-lattice coupling, which may drive a second-order into a first-order transition [25]. It is also possible that a transition transforms from second to first order, when T c is suppressed towards 0 K by an external parameter.…”

Section: Resultsmentioning

confidence: 99%

Thermodynamics of the coupled spin-dimer system close to a quantum phase transition

Lorenz

Stark

Heyer

et al. 2007

Journal of Magnetism and Magnetic Materials

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We present thermal expansion α, magnetostriction and specific heat C measurements of TlCuCl3, which shows a quantum phase transition from a spin-gap phase to a Néel-ordered ground state as a function of magnetic field around HC0 ≃ 4.8 T. Using Ehrenfest's relation, we find huge pressure dependencies of the spin gap for uniaxial as well as for hydrostatic pressure. For T → 0 and H ≃ HC0 we observe a diverging Grüneisen parameter Γ(T ) = α/C, in qualitative agreement with theoretical predictions. However, the predicted individual temperature dependencies α(T ) and C(T ) are not reproduced by our experimental data.

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Section: Resultsmentioning

confidence: 99%

Thermodynamics of the coupled spin-dimer system close to a quantum phase transition

Lorenz

Stark

Heyer

et al. 2007

Journal of Magnetism and Magnetic Materials

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“…Because a negative fourth-order term in Landau free energy (Equation (A8)) creates an energy barrier in the free energy landscape, this leads to a first-order transition. It is interesting that a renormalization group approach also yields a similar conclusion: a second-order transition is changed into a first-order transition if a primary order parameter (P z ) is coupled to the strain in the fluctuation region near T C [77].…”

Section: Discussionmentioning

confidence: 86%

Understanding Complex Interplay among Different Instabilities in Multiferroic BiMn7O12 Using 57Fe Probe Mössbauer Spectroscopy

Soboleva,

Nitsenko,

Sobolev

et al. 2024

IJMS

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Here, we report the results of a Mössbauer study on hyperfine electrical and magnetic interactions in quadruple perovskite BiMn7O12 doped with 57Fe probes. Measurements were performed in the temperature range of 10 K < T < 670 K, wherein BiMn6.9657Fe0.04O12 undergoes a cascade of structural (T1 ≈ 590 K, T2 ≈ 442 K, and T3 ≈ 240 K) and magnetic (TN1 ≈ 57 K, TN2 ≈ 50 K, and TN3 ≈ 24 K) phase transitions. The analysis of the electric field gradient (EFG) parameters, including the dipole contribution from Bi3+ ions, confirmed the presence of the local dipole moments pBi, which are randomly oriented in the paraelectric cubic phase (T > T1). The unusual behavior of the parameters of hyperfine interactions between T1 and T2 was attributed to the dynamic Jahn–Teller effect that leads to the softening of the orbital mode of Mn3+ ions. The parameters of the hyperfine interactions of 57Fe in the phases with non-zero spontaneous electrical polarization (Ps), including the P1 ↔ Im transition at T3, were analyzed. On the basis of the structural data and the quadrupole splitting Δ(T) derived from the 57Fe Mössbauer spectra, the algorithm, based on the Born effective charge model, is proposed to describe Ps(T) dependence. The Ps(T) dependence around the Im ↔ I2/m phase transition at T2 is analyzed using the effective field approach. Possible reasons for the complex relaxation behavior of the spectra in the magnetically ordered states (T < TN1) are also discussed.

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Anomalous Scattering Near Second-Order Phase Transitions and Critical Points

Krivolaz¹

1996

Diffuse Scattering of X-Rays and Neutrons by Fluctuations

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Directional phase instability on a cubic compressible lattice near a second-order phase transition with a three-component order parameter

Cited by 22 publications

References 12 publications

Thermodynamics of the coupled spin-dimer system close to a quantum phase transition

Thermodynamics of the coupled spin-dimer system close to a quantum phase transition

Understanding Complex Interplay among Different Instabilities in Multiferroic BiMn7O12 Using 57Fe Probe Mössbauer Spectroscopy

Anomalous Scattering Near Second-Order Phase Transitions and Critical Points

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