X-ray- and neutron-diffraction measurements on BaMn<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>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Cox, D. E.; Shapiro, S. M.; Nelmes, R. J.; Ryan, T.W.; Bleif, H.-J.; Cowley, R. A.; Eibschütz, M.; Guggenheim, H. J.

doi:10.1103/physrevb.28.1640

Cited by 42 publications

(8 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Let us recall that the set of experimental data now available permits us to know which case applies to the real system. Indeed, it was shown in [14], that systematic extinctions in the reciprocal space occur at positions such as k1 + k2 (and symmetry related ones). This hinted at a spatial separation of the modulations with k1 and k2 vectors.…”

Section: Discussionmentioning

confidence: 99%

“…However, these results were contradicted afterwards [14] and no additional anomaly could be observed in birefringence [9] or indices [10] variation. Other experiments recently exhibited 4 or 5 anomalies, as determined by piezoelectric resonance data [15], and two of these correspond to visible anomalies of thermal diffusivity.…”

Section: Classificationmentioning

confidence: 99%

“…The summary of all the results obtained up to now is presented in figure 1. Curve « A » refers to the study of reference [14], performed by means of X-Ray diffraction. Curves « B » and « C » refer to the neutron diffraction data of [7].…”

Section: Data On the Modulation Wave Vector -mentioning

confidence: 99%

See 2 more Smart Citations

On the incommensurate phase in BaMnF4: sample dependence of the order parameter

et al. 1988

View full text Add to dashboard Cite

2014 Nous présentons des résultats sur la dépendance en fonction des échantillons, du vecteur d'onde de la modulation, et de l'amplitude du paramètre d'ordre qui décrit la transition N (A21am) ~ incommensurable dans BaMnF4 : des mesures de diffraction de rayons X, de Cp (« DSC »), et de biréfringence, ont été effectuées sur un large éventail de cristaux synthétisés par les méthodes de Bridgman, de Czochralski, et hydrothermale. Nous proposons l'existence d'un point tricritique pouvant être atteint sous contrainte 03C3yz, et donnons une nouvelle interprétation de l'anomalie de Cp qui avait été observée en 1982 par Scott, Habbal et Hidaka. Abstract. 2014 We present results concerning sample dependence of not only the modulation wave vector, but also of the amplitude of the order parameter describing the N (A21am) ~ incommensurate phase transition in BaMnF4: X-ray diffraction, Cp (« DSC »), and birefringence measurements were performed on a wide set of crystals which were synthetized by Bridgman, Czochralski, and hydrothermal methods. The existence of a tricritical point which can be reached under a 03C3vz stress is proposed, and a new interpretation of the Cp anomaly observed in 1982 by Scott, Habbal and Hidaka, is given.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Classificationmentioning

confidence: 99%

See 1 more Smart Citation

On the incommensurate phase in BaMnF4: sample dependence of the order parameter

et al. 1988

View full text Add to dashboard Cite

show abstract

“…The incommensurate material [88][89][90][91][92] of maximum multiferroic interest is probably BaMnF 4 . 39,40 Whereas Ederer et al 41 did a nice DFT computation for BaNiF 4 , the situation in BaMnF 4 is far more challenging, because it has incommensurate phases between its paraelectric and ferroelectric phase.…”

Section: Incommensurate Structure Predictionsmentioning

confidence: 99%

“…39,40 Whereas Ederer et al 41 did a nice DFT computation for BaNiF 4 , the situation in BaMnF 4 is far more challenging, because it has incommensurate phases between its paraelectric and ferroelectric phase. Samples from Howard Guggenheim at Bell Labs were used in both the work at Brookhaven 88,92 (Eibschutz et al) and by the present author. These exhibit a single paraelectric-ferroelectric transition near 254 K with soft mode at q* = (0.392, 1/2, 1/2) a* of the high-temperature phase.…”

Section: Incommensurate Structure Predictionsmentioning

confidence: 99%

Searching for new ferroelectrics and multiferroics: A user’s point of view

Scott

2015

npj Comput Mater

View full text Add to dashboard Cite

A perspective on computational studies of ferroelectrics and multiferroics is given that emphasises what has yet to be done, along with some subtleties in previously studied systems. Beginning with the extensive data-mining studies of Abrahams and more recently, Rabe, a survey is given of magnetostrictive effects in antiferromagnetic antiferroelectrics (after Toledano and Toledano), which has an nonmagnetic analogy in the antiferroelectric phase of tris-sarcosine calcium chloride and a reminder of the unusual spin-phonon coupling of Holden et al. in systems such as KCoF 3 and EuTiO 3 . Attention is also paid to field-temperature phase diagrams, finite non-periodic boundary conditions, and processing-dependent structures.

show abstract

New results in incommensurate crystals: Kink diffusion and long‐period lock‐in phases

Scott

1986

J Raman Spectroscopy

View full text Add to dashboard Cite

Two new results for incommensurate phases of crystals are discussed: the experimental observation of a q2 dependence of the inverse relaxation time observed in the hypersonic regime via near-forward Brillouin scattering experiments, tentatively interpreted as kink diffusion, and the theoretical demonstration that long-period lock-in phases observed in crystals which are simultaneously ferroelectric in their incommensurate phases are stabilized by the spontaneous polarization field. This theory explains the observed limits of incommensurate wave vector in BaMnF, as a function of temperature: 2a*/5 = 0.399a* -0.389a* = 5a*/13, where the 2/5 value is the low-temperature limit and the 5/13 value is the high-temperature limit. It also explains one mechanism for stabilizing the 2/5 phase at lower temperatures than are permitted in the ANNNI (axial next-nearest neighbour Ising) model of Yamada and Hamaya in the absence of a spontaneous polarization field. ~~~

show abstract

X-ray- and neutron-diffraction measurements on BaMnF4

Cited by 42 publications

References 6 publications

On the incommensurate phase in BaMnF4: sample dependence of the order parameter

On the incommensurate phase in BaMnF4: sample dependence of the order parameter

Searching for new ferroelectrics and multiferroics: A user’s point of view

New results in incommensurate crystals: Kink diffusion and long‐period lock‐in phases

Contact Info

Product

Resources

About