Magnetic Structure of the Cubic Perovskite Type SrMnO<sub>3</sub>

Takeda, Tomo; Ōhara, S.

doi:10.1143/jpsj.37.275

Cited by 181 publications

(94 citation statements)

References 6 publications

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“…For the interplane distance we consider the two values c/a =1.005, 1.01, which are experimentally determined for the SBMO at different temperatures [14]. For all the above parameters SBMO is safely in an AFM (G-type) insulating state with a band gap of ∼ 0.4 eV with Mn magnetic moments M ∼ 2.6 µ b , in agreement with previous DFT calculations on CaMnO 3 and SrMnO 3 [12,13,21] and experiments on SrMnO 3 [22]. The valence band is predominantly majority-spin Mn t 2g and O 2p characther with strong p−d hybridization while the conduction band is formed by Mn e g orbital and empty minority t 2g states, which is consistent with Mn…”

Section: Pacs Numberssupporting

confidence: 88%

Microscopic Origin of Large Negative Magnetoelectric Coupling inSr1/2Ba1/2MnO3

et al. 2012

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With a combined ab initio density functional and model Hamiltonian approach we establish that in the recently discovered multiferroic phase of the manganite Sr 1/2 Ba 1/2 MnO3 the polar distortion of Mn and O ions is stabilized via enhanced in-plane Mn-O hybridizations. The magnetic superexchange interaction is very sensitive to the polar bond-bending distortion, and we find that this dependence directly causes a strong magnetoelectric coupling. This novel mechanism for multiferroicity is consistent with the experimentally observed reduced ferroelectric polarization upon the onset of magnetic ordering. PACS numbers:Multiferroic materials are ideal candidates for the realization and practical use of strong magnetoelectric effects [1,2]. The scarcity of actual materials that are magnetic ferroelectrics appears to be related to the competition between the conventional mechanism of ferroelectric cation off-centering, which requires empty d-orbitals, and the formation of magnetic moments which requires partially filled d-orbitals [1,2]. A concomitance of magnetism and ferroelectricity then has to rely on more subtle microscopic coupling mechanisms, driven by spinorbit coupling in the form of Dzyaloshinskii-Moriya interactions [3] or exchange-striction [4]. The recently synthesized manganite Sr 1/2 Ba 1/2 MnO 3 however defeats the generic incompatibility of a cation both having a magnetic moment and being ferroelectrically displaced. This system is a classic example of a material in which charge, spin, lattice and orbital degrees of freedom are strongly coupled, giving in this particular case rise to a strong magnetoelectric (ME) effect, the origin of which we set out to clarify here.For doing so, the methods from modern ab initio bandstructure theory are powerfull tools -very helpful not only in predicting new multiferroic materials, but also in understanding the underlying mechanisms for magnetoelectric couplings. The computed values of macroscopic polarization P agree exceptionally well with those observed experimentally [5][6][7][8][9][10]. In the last few years several ab initio calculations have pointed out the possible ferroelectric state with large polarization for AMnO 3 , where A is an alkaline earth element. The proposed mechanism is based on off-centering of Mn 4+ ions stabilized via a charge-lattice coupling of Peierls type [11][12][13]. The problems in synthesizing such a material with predicted ferroelectricity has very recently been overcome: last year Sr 1/2 Ba 1/2 MnO 3 (SBMO) has been reported to support a ferroelectric phase via the off-centering of magnetic Mn 4+ ion in conjunction with a perovskite tetragonal structure [14]. The onset of the low-temperature long-range antiferromagnetic (AFM) ordering strongly reduces the polarization indicating a large magnetoelectric effect [14]. The AFM order, in other words, does not support ferroelectricity, but it neither completely destroys it. This special feature of SBMO opens a new avenue for the quest of materials with strong ME effects, where the searc...

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Section: Pacs Numberssupporting

confidence: 88%

Microscopic Origin of Large Negative Magnetoelectric Coupling inSr1/2Ba1/2MnO3

et al. 2012

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“…¦ÔÎË ÊÂÏÇÔÕËÕß Ä ÐÇÏ LÂ ÐÂ AEÄÖØÄÂÎÇÐÕÐÞÌ ÏÇÕÂÎÎ, ÐÂÒÓËÏÇÓ ³Â, ÕÑ Ä ÒÓÇAEÇÎÇ ÒÑÎÐÑÅÑ ÊÂÏÇÜÇÐËâ ÑÐ ÒÇÓÇÌAEÇÕ Ä CaMnO 3 .°ÃÂ àÕË ÏÂÕÇÓËÂÎÂ ËÏÇáÕ ÔÕÓÖÍÕÖÓÖ ÒÇÓÑÄÔÍËÕÂ [32,33]. ³ÕÓÖÍÕÖÓÖ ËAEÇÂÎßÐÑÅÑ ÍÖÃËÚÇÔÍÑÅÑ ÒÇÓÑÄÔÍËÕÂ ABO 3 ÏÑÉÐÑ ÒÓÇAEÔÕÂÄËÕß ÍÂÍ ÔÑÄÑÍÖÒÐÑÔÕß ÒÓÂÄËÎßÐÞØ ÑÍÕÂàAEÓÑÄ BO 3 , ÍÑÕÑÓÞÇ ÍÂÔÂáÕÔâ AEÓÖÅ AEÓÖÅÂ ÄÇÓÛËÐÂÏË [34,35].…”

Section: ¬óëôõâîîñåóâ×ëúçôíëç ôäñìôõäâ ïâðåâðëõñä îâðõâðâ°ôunclassified

Lanthanum manganites and other giant-magnetoresistance magnetic conductors

Nagaev¹

1996

Uspekhi Fizicheskikh Nauk

295

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“…18 The cubic perovskite phase can be kept in a metastable state at 300 K, 19 and has a lattice parameter of 3.805Å. 20 Unstrained cubic SMO shows G-type AFM ordering with 2.6 ± 0.2 µ B magnetic moment per Mn 4+ atom below its Néel temperature (T N ), 21,22 which was reported between 233 K and 260 K, [20][21][22][23] this dispersion being probably caused by the variable oxygen stoichiometry in the samples. 22 Further studies showed how the magnetic ordering strongly depends on the tetragonality (c/a ratio) of the unit cell.…”

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confidence: 97%

Nature of antiferromagnetic order in epitaxially strained multiferroicSrMnO3thin films

et al. 2015

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Epitaxial films of SrMnO3 and bilayers of SrMnO3 / La0.67Sr0.33MnO3 have been deposited by pulsed laser deposition on different substrates, namely LaAlO3 (001), (LaAlO3)0.3(Sr2AlTaO6)0.7 (001) and SrTiO3 (001), allowing us to perform an exhaustive study of the dependence of antiferromagnetic order and exchange bias field on epitaxial strain. The Néel temperatures (TN ) of the SrMnO3 films have been determined by low energy muon spin spectroscopy. In agreement with theoretical predictions, TN is reduced as the epitaxial strain increases. From the comparison with first-principle calculations, a crossover from G-type to C-type antiferromagnetic orders is proposed at a critical tensile strain of around 1.6 ± 0.1 %. The exchange bias (coercive) field, obtained for the bilayers, increases (decreases) by increasing the epitaxial strain in the SrMnO3 layer, following an exponential dependence with temperature. Our experimental results can be explained by the existence of a spin-glass (SG) state at the interface between the SrMnO3 and La0.67Sr0.33MnO3 films. This SG state is due to the competition between the different exchange interactions present in the bilayer and favored by increasing the strain in SrMnO3 layer.

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Magnetic Structure of the Cubic Perovskite Type SrMnO₃

Cited by 181 publications

References 6 publications

Microscopic Origin of Large Negative Magnetoelectric Coupling inSr1/2Ba1/2MnO3

Microscopic Origin of Large Negative Magnetoelectric Coupling inSr1/2Ba1/2MnO3

Lanthanum manganites and other giant-magnetoresistance magnetic conductors

Nature of antiferromagnetic order in epitaxially strained multiferroicSrMnO3thin films

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Magnetic Structure of the Cubic Perovskite Type SrMnO3

Cited by 181 publications

References 6 publications

Microscopic Origin of Large Negative Magnetoelectric Coupling inSr1/2Ba1/2MnO3

Microscopic Origin of Large Negative Magnetoelectric Coupling inSr1/2Ba1/2MnO3

Lanthanum manganites and other giant-magnetoresistance magnetic conductors

Nature of antiferromagnetic order in epitaxially strained multiferroicSrMnO3thin films

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Magnetic Structure of the Cubic Perovskite Type SrMnO₃