Glassy Phenomena in Relaxor Ferroelectrics

Kleemann, W.

doi:10.1007/978-3-642-55375-2_10

Cited by 6 publications

(1 citation statement)

References 68 publications

(151 reference statements)

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“…Recently, it has been proposed that the ground state of relaxors is that of a cluster glass in which polar domains generated by random fields cluster at low temperatures due to frustrating nature of the dipolar force. 26 The mechanism by which such glassy state is formed is described by the subsequent formation of polar domains due to random electric fields and the clustering of mesoscopic domains due to frustrated random dipolar interactions. While we do not study this problem here, we cannot rule out that such freezing mechanisms may be out of reach of the theoretical treatment that is presented here, as nucleation of polar domains within the disordered matrix may occur as there are stable ordered states in the free energy of our model.…”

Section: -19mentioning

confidence: 99%

Structure factor of a relaxor ferroelectric

Guzmán-Verri

Varma

2015

Phys. Rev. B

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We study a minimal model for a relaxor ferroelectric including dipolar interactions, and short-range harmonic and anharmonic forces for the critical modes as in the theory of pure ferroelectrics together with quenched disorder coupled linearly to the critical modes.We present the simplest approximate solution of the model necessary to obtain the principal features of the correlation functions. Specifically, we calculate and compare the structure factor measured by neutron scattering in different characteristic regimes of temperature in the relaxor PbMg 1/3 Nb 2/3 O3 (PMN).

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Section: -19mentioning

confidence: 99%

Structure factor of a relaxor ferroelectric

Guzmán-Verri

Varma

2015

Phys. Rev. B

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Multiferroic Clusters: A New Perspective for Relaxor‐Type Room‐Temperature Multiferroics

Henrichs

Céspedes

Bennett

et al. 2016

Adv Funct Materials

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Multiferroics are promising for sensor and memory applications, but despite all efforts invested in their research no single-phase material displaying both ferroelectricity and large magnetization at room-temperature has hitherto been reported. This situation has substantially been improved in the novel relaxor ferroelectric single-phase (BiFe 0.9 Co 0.1 O 3 ) 0.4 -(Bi 1/2 K 1/2 TiO 3 ) 0.6 , where polar nanoregions (PNR) transform into static-PNR (SPNR) as evidenced by piezoresponse force microscopy (PFM) and simultaneously enable congruent multiferroic clusters (MFC) to emerge from inherent ferrimagnetic Bi(Fe,Co)O 3 regions as verified by magnetic force microscopy (MFM) and secondary ion mass spectrometry (SIMS).On these MFC, exceptionally large direct and converse magnetoelectric coupling coefficients, α ≈ 1.0 x 10 -5 s/m at room-temperature, were measured by PFM and MFM respectively. We expect the non-ergodic relaxor properties which are governed by the Bi 1/2 K 1/2 TiO 3 component to play a vital role in the strong ME coupling, by providing an electrically and mechanically flexible environment to MFC. This new class of non-ergodic relaxor multiferroics bears great 3 potential for applications. Especially the prospect of a ME nanodot storage device seems appealing.

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