Tricritical Behavior in KMn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Stokka, Sigmund; Fossheim, K.; Samulionis, V.

doi:10.1103/physrevlett.47.1740

Cited by 27 publications

(16 citation statements)

References 8 publications

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“…[110] axis [36,37]. Extrapolating their data to room temperature leads to a critical stress of 1.34 GPa, which is significantly smaller than the isotropic critical pressure of 3.4 GPa.…”

Section: Discussionmentioning

confidence: 99%

Pressure-induced phase transition(s) in KMnF₃and the importance of the excess volume for phase transitions in perovskite structures

Guennou

Bouvier

Garbarino

et al. 2011

J. Phys.: Condens. Matter

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We report a pressure-dependent investigation of KMnF(3) by x-ray diffraction up to 30 GPa. The results are discussed in the framework of Landau theory and in relation to the isostructural phase transition in SrTiO(3). The phase transition temperature near 186 K in KMnF(3) shifts to room temperature at a critical pressure of P(c) = 3.4 GPa; the pressure dependence of the transition point follows ΔP(c)/ΔT(c) = 0.0315 GPa K(-1). The transition becomes second order under high pressure, close to the tricritical point. The phase transition is determined by the rotation of MnF(6) octahedra with their simultaneous expansion along the rotation axis. The rotation angle was found to increase to 10.5° at 24 GPa. An additional anomaly was observed at higher pressure around 25 GPa, suggesting a further phase transition.

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“…[110] axis [36,37]. Extrapolating their data to room temperature leads to a critical stress of 1.34 GPa, which is significantly smaller than the isotropic critical pressure of 3.4 GPa.…”

Section: Discussionmentioning

confidence: 99%

Pressure-induced phase transition(s) in KMnF₃and the importance of the excess volume for phase transitions in perovskite structures

Guennou

Bouvier

Garbarino

et al. 2011

J. Phys.: Condens. Matter

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“…Hydrostatic pressure-(p-) induced TCP have been observed for KDP, BaTiO 3 , PbTiO 3 and other ferroelectric crystals, as summarized in reviews by Srinivasan et al [5] and Gesi [6]. Uniaxial pressure (X) induces a change † from a first-order to a second-order PT for RbCaF 3 [7], KMnF 3 [8], and SrTiO 3 [9]. The review by Müller [10] summarizes the application of uniaxial stress in studies of a variety of multicritical points and suggested the possibility of their observation in SrTiO 3 and KMnF 3 .…”

Section: Koralewski Et Almentioning

confidence: 99%

The effect of uniaxial pressure on the ferroelectric phase transition of TGSe crystals

Koralewski

Stankowska

Iglesias

et al. 1996

J. Phys.: Condens. Matter

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Isobaric studies of the influence of uniaxial pressure on the transitions of pure TGSe crystals for the three directions x, y, z (a * , b, c) are reported. The critical exponents, β, δ and γ , from dielectric constant and hysteresis loop measurements, as well as the coefficients ξ and ζ of the fourth and sixth powers of P in the free-energy expansion under uniaxial pressure were determined. It has been found that uniaxial pressure applied along the a * -axis keeps the transition near a tricritical point for 0 < X < 200 bar, but that when it is applied along the band c-axes it strengthens the second-order phase transition behaviour. The tricritical behaviour of TGSe crystals is discussed and a possible driving mechanism for the change in order of the phase transition is proposed. † We are not concerned here with ferroelastic crystals, for which several examples of a TCP or Lifshitz TCP (LTCP) are known and have been studied both experimentally and theoretically.

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“…5 Hidaka et al (1975) 25 81 88 91 Benard and Walker (1976) 26 80 89 184 Holt and Fossheim (1981) 27 187. 2 Stokka et al (1981) 4 186.9 Sakashita et al (1981) 5 186.7 28 83/84 87.7 ± 0.1 95 188 Hidaka et al (1986) 29 83 88 88 Hidaka et al (1989) 30 83 92 83 88.0 Sakashita et al (1990) 6 186 * Gibaud et al (1991) 1 82 88 186.5 Ratuszna and Kachel (1992) 31 91 186 Kapusta et al (1999) 32 96 195 * Hayward et al (2000) 11 186.0 Watanabe et al (2006) 33 81-84 Salazar et al (2007) 34 79. 35 91.0 186.7 * Salje et al (2009) 36 186.0 * Salje and Zhang (2009) 37 184 Kizhaev and Markova (2011) 38 82 phase IV as it is the typical low-temperature structure of most perovskites with both Rand M-point tilting, including NaMnF 3 and NH 4 MnF 3 for example.…”

Section: Sourcementioning

confidence: 99%

“…The cubic (P m3m) → tetragonal (I 4/mcm) transition is weakly first order but close to tricritical in character. [1][2][3][4][5][6][7][8][9][10][11] Values of T c1 from the literature are in the range 184-189 K, and there are only two outliers at 195 K ( Table I). The space groups of phases III and IV have not been determined, but single-crystal diffraction patterns from phase III reveal the presence of both R-point and M-point reflections.…”

Section: Introductionmentioning

confidence: 99%

Magnetoelastic coupling and multiferroic ferroelastic/magnetic phase transitions in the perovskite KMnF3

2012

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The magnetic, elastic, and anelastic behavior of single-crystal KMnF 3 have been investigated by superconducting quantum interference device (SQUID) magnetometry and resonant ultrasound spectroscopy (RUS) through the sequence of phase transitions: phase I, P m3m → (T c1 = 185 K) → phase II, I 4/mcm → (T c2 = T N = 87 K) → phase III, antiferromagnetic, Cmcm → (T c3 = 82 K) → phase IV, canted ferromagnet, Pnma. It is concluded that observed changes in the elastic properties can be explained simply in terms of strain/order parameter coupling for the octahedral tilting transitions. There appears to be no evidence in the present data or in data from the literature for coupling between the magnetic order parameter and shear strains. Any coupling between the magnetic and structural transitions is therefore weak, probably occurring only biquadratically through a small common volume strain. The combined data show unambiguously that, for the crystal used, the Néel point and the structural transition at 87 K are coincident. In other crystals, with slightly different stoichiometries and defect contents, this need not be the case, however, and the overlap of transition temperatures in KMnF 3 is essentially accidental. Strong acoustic dissipation at ∼0.1-1 MHz in the stability field of phase II is attributed to the local mobility of transformation twin walls under externally applied stress. A Debye-like loss peak near 130 K is attributed to pinning of at least some twin walls by defects, but relatively high levels of acoustic dissipation below this freezing temperature imply that some of the twin walls remain mobile due to weak pinning or the absence of any pinning. Acoustic losses continue in the stability field of phase III (Cmcm) but diminish substantially in the stability field of phase IV (Pnma), implying quite different twin mobilities in the different structure types. Overlap of the structural and magnetic instabilities in KMnF 3 opens up possibilities for manipulation of ferroelastic twinning by application of a magnetic field and for creation of materials in which the ferroelastic twin walls have quite different magnetic properties from the matrix in which they lie.

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Tricritical Behavior in KMnF3

Cited by 27 publications

References 8 publications

Pressure-induced phase transition(s) in KMnF₃and the importance of the excess volume for phase transitions in perovskite structures

Pressure-induced phase transition(s) in KMnF₃and the importance of the excess volume for phase transitions in perovskite structures

The effect of uniaxial pressure on the ferroelectric phase transition of TGSe crystals

Magnetoelastic coupling and multiferroic ferroelastic/magnetic phase transitions in the perovskite KMnF3

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Tricritical Behavior in KMnF3

Cited by 27 publications

References 8 publications

Pressure-induced phase transition(s) in KMnF3and the importance of the excess volume for phase transitions in perovskite structures

Pressure-induced phase transition(s) in KMnF3and the importance of the excess volume for phase transitions in perovskite structures

The effect of uniaxial pressure on the ferroelectric phase transition of TGSe crystals

Magnetoelastic coupling and multiferroic ferroelastic/magnetic phase transitions in the perovskite KMnF3

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Pressure-induced phase transition(s) in KMnF₃and the importance of the excess volume for phase transitions in perovskite structures

Pressure-induced phase transition(s) in KMnF₃and the importance of the excess volume for phase transitions in perovskite structures