Toward pressure-induced multiferroicity in 
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Peng, Wei; Balédent, V.; Chattopadhyay, S.; Lepetit, Marie-Bernadette; Yahia, G.; Colin, Claire; Gooch, Melissa; Pasquier, Claude; Auban‐Senzier, Pascale; Greenblatt, Martha; Foury-Leylekian, P.

doi:10.1103/physrevb.96.054418

Cited by 9 publications

(18 citation statements)

References 26 publications

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“…The main result of our experiments is the observation of a pressure-induced PCM phase with propagation vector k = ( 1 2 0 1 2 ) in DyMn 2 O 5 and TbMn 2 O 5 despite their different propagation vectors at ambient pressure. Being also observed in YMn 2 O 5 and in PrMn 2 O 5 under high pressure [24], such periodicity most likely corresponds to a high-pressure ground state which is generic in the RMn 2 O 5 family. Assuming a planar structure, we find that the PCM phase must be associated with a lowering of symmetry along the c axis to the P 1 SG (see the Supplemental Material [32]).…”

Section: Discussionmentioning

confidence: 69%

“…In this paper, we address this question and pursue the idea that applying pressure is a good tool to unveil the mechanisms at the origin of these behaviors on a macroscopic scale [16,21] or microscopic one [22,23]. Previous neutron-diffraction studies on YMn 2 O 5 and PrMn 2 O 5 under high pressure have shown the onset of a pressure-induced commensurate phase (PCM), which appears at low pressure and progressively develops as pressure increases at the expense of both the ambient pressure CM and the ICM phases [22][23][24]. The PCM phase propagation vector k = ( 1 2 0 1 2 ) is the same as in BiMn 2 O 5 at ambient pressure.…”

Section: Introductionmentioning

confidence: 99%

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Pressure-induced commensurate order in TbMn2O5 and DyMn2O5 : Influen

et al. 2018

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Section: Discussionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Pressure-induced commensurate order in TbMn2O5 and DyMn2O5 : Influen

et al. 2018

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“…In these complex systems, the large effect of small variations in the interatomic distances and angles on the super-exchange integrals induces a strong dependence of the multiferroic properties on external factors. Indeed, an enhanced polarization has been observed under pressure (de la Cruz et al, 2006;Chaudhury et al, 2008) in the RMn 2 O 5 (R = Tb, Ho and Y) compounds and it has been associated with a new pressure-induced magnetic phase, recently shown by neutron measurements on Y (Deutsch et al, 2015;Kozlenko et al, 2015), Tb (Deutsch et al, 2018) and PrMn 2 O 5 (Peng et al, 2017). The dependence of the electric polarization of RMn 2 O 5 at ambient pressure as a function of the ionic radius of R 3+ .…”

Section: Introductionmentioning

confidence: 96%

Pressure-dependent X-ray diffraction of the multiferroics RMn₂O₅

Peng¹,

Balédent²,

Lepetit³

et al. 2019

Acta Crystallogr Sect B

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The room-temperature structural properties of the RMn 2 O 5 multiferroics have been investigated under pressure, using powder X-ray scattering and density functional theory (DFT) calculations. It was possible to determine the lattice parameters and the main atomic positions as a function of pressure. Good agreement was observed between the X-ray and DFT results for most of the determined crystallographic data. From the DFT calculations, it was possible to infer the pressure evolution of the exchange interactions, and this analysis led to the conclusion that the onset of the q = ( 1 2 , 0, 1 2 ) magnetic structure under pressure is related to the increase in the J 1 super-exchange terms (due to the reduction in the Mn-O distances) compared with the Mn-R exchange interactions. In addition, the 1D antiferromagnetic character of the compounds should be reinforced under pressure.

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“…Our previous study shows that although the ground states are diverse, the doping effects of some 3d ions on Ru sites show consistency. That is, Mn and Ti dopants induce or enhance the Mott insulating state and AFM coupling, while Cr, Fe, or Co enhances the FM coupling [19]. For example, in double layer ruthenates, Ca3Ru2O7, it shows an antiferromagnetic (AFM) transition at 56 K, which is then followed by a metal-insulator transition (MIT) at 48 K [20].…”

Section: Introductionmentioning

confidence: 99%

“…The spin direction switches from the a-axis (AFMa) for TMIT < T < TN to the b-axis (AFM-b) for T < TMIT [17,21]. As few as 3% Ti doping or 4% Mn doping on the ruthenium site can tune the system from a quasi-2D metallic state with AFM-b order to a Mott insulating state with a G-type AFM order through a phase separation regions [19,22,23].…”

Section: Introductionmentioning

confidence: 99%

Electron mass enhancement and magnetic phase separation near the Mott transition in double-layer ruthenates

Jin¹,

Gu²,

Zhou³

et al. 2018

Front. Phys.

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We present a detailed investigation of the specific heat in Ca3(Ru1-xMx)2O7 (M = Ti, Fe, Mn) single crystals. With different dopants and doping levels, three distinct regions are present, including a quasi-2D metallic state with an antiferromagnetic (AFM) order formed by ferromagnetic bilayers (AFM-b), a Mott insulating state with G-type AFM order (G-AFM) and a localized state with a mixed AFM-b and G-AFM phase. Our specific heat data provide deep insights into the Mott transitions induced by Ti and Mn dopings. We observed not only an anomalous large mass enhancement but also an additional term in the specific heat i.e. 2 C T in the localized region. The 2 C T  term is most likely due to the long-wavelength excitations with both FM and AFM components. A decrease of Debye temperature is observed in the G-type AFM region, indicating a lattice softening associated with the Mott transition. n  . However, non-zero value of  in insulating materials were reported before. P. W. Anderson proposed that the linear specific heat component is a general feature on the glassy state, including spin glass, due to statistical distribution of localized "tunneling levels[28]. Interestingly, various studies of manganites reveal large γ in insulating crystalline compositions. For example, in Nd0.67Sr0.33MnO3, a value of 2 25 / mJ mol K   was observed and in the electron-doped system La2.3Ca0.7Mn2O3, 2 41 / mJ mol K   .[29,30]. In the hole-doped LaMnO3+δ,  reaches as high as 2 23/ mJ mol K [31]. In La0.2Sr0.8MnO3, 2 5.6 / mJ mol K   [32] .Obviously that the finite linear specific heat coefficient not only appear in spin glass phase.In undoped Ca3Ru2O7, the small value of sommerfeld coefficient (  ~ 1.7 mJ/ Ru mol T 2 ) arising from the non-nesting fermi surface pockets survived. In Ru-site doped Ca3Ru2O7, the itinerant Ru t2g electrons may be localized due to the potential fluctuations arising from cation substitution and spin-dependent fluctuations due to local deviations from AFM-b magnetic order. If the doping concentration is fairly low, the localization length may be fairly large. Charge carriers can thus hop through a number of Ru ions, defines limited length of bilayer FM clusters. On the other hand, the electron levels although localized, are not largely spaced in energy, allowing for thermal excitations that contribute with a linear term to specific heat. From Fig. 4, we noticed that enhanced  appears simultaneously with the T 2 term. As state above, the T 2 term is due to the longwavelength excitations with both FM and AFM components in the magnetic phase separation region.The proposed scenario above is consistent with this picture.Above scenario explain the non-zero sommerfeld coefficient in insulating state. Why this coefficient is one order larger than pristine compound. Actually, enhanced  near Mott transition is ubiquitous, especially the ones with antiferromagnetism. For example, the heavy fermion compounds, the high-Tc cuprates, the Mott-Hubbard systems V2O3 and Ni(Se1-xSx)2 [8,33,34]. In V2O3 system, met...

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Toward pressure-induced multiferroicity in PrMn2O5

Cited by 9 publications

References 26 publications

Pressure-induced commensurate order in TbMn2O5 and DyMn2O5 : Influen

Pressure-induced commensurate order in TbMn2O5 and DyMn2O5 : Influen

Pressure-dependent X-ray diffraction of the multiferroics RMn₂O₅

Electron mass enhancement and magnetic phase separation near the Mott transition in double-layer ruthenates

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Toward pressure-induced multiferroicity in PrMn2O5

Cited by 9 publications

References 26 publications

Pressure-induced commensurate order in TbMn2O5 and DyMn2O5 : Influen

Pressure-induced commensurate order in TbMn2O5 and DyMn2O5 : Influen

Pressure-dependent X-ray diffraction of the multiferroics RMn2O5

Electron mass enhancement and magnetic phase separation near the Mott transition in double-layer ruthenates

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Product

Resources

About

Pressure-dependent X-ray diffraction of the multiferroics RMn₂O₅