Group theory and magnetic phenomena in solids

Cracknell, A. P.

doi:10.1088/0034-4885/32/2/305

Cited by 38 publications

(17 citation statements)

References 77 publications

(86 reference statements)

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Order By: Relevance

“…Any spatial translation cannot overlap one order state to the other because the corner and body-centred sites have different fluorine environments: an additional rotation by 90° is required for this overlap. Therefore, the time-reversal symmetry is macroscopically broken 24 . This is important for applying optical methods to the control of antiferromagnetic order, because optical fields are macroscopic stimuli for the magnetic ordering; that is, the light cannot distinguish a half-unit-cell translation.…”

Section: Resultsmentioning

confidence: 99%

Control of antiferromagnetic domain distribution via polarization-dependent optical annealing

Higuchi

Kuwata‐Gonokami

2016

Nat Commun

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The absence of net magnetization inside antiferromagnetic domains has made the control of their spatial distribution quite challenging. Here we experimentally demonstrate an optical method for controlling antiferromagnetic domain distributions in MnF2. Reduced crystalline symmetry can couple an order parameter with non-conjugate external stimuli. In the case of MnF2, time-reversal symmetry is macroscopically broken reflecting the different orientations of the two magnetic sublattices. Thus, it exhibits different absorption coefficients between two orthogonal linear polarizations below its antiferromagnetic transition temperature under an external magnetic field. Illumination with linearly polarized laser light under this condition selectively destructs the formation of a particular antiferromagnetic order via heating. As a result, the other antiferromagnetic order is favoured inside the laser spot, achieving spatially localized selection of an antiferromagnetic order. Applications to control of interface states at antiferromagnetic domain boundaries, exchange bias and control of spin currents are expected.

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Section: Resultsmentioning

confidence: 99%

Control of antiferromagnetic domain distribution via polarization-dependent optical annealing

Higuchi

Kuwata‐Gonokami

2016

Nat Commun

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“…This also concerns the quaternary, or better known as pseudo-ternary, alloys Pd2T1−x′Tx′′Al with T′= Zr or Hf, and T′′= Y or Nb [15]. However, the superconducting state requires a reduction of symmetry, as has already been demonstrated by Cracknell [26]. As a real vector, a current allows for symmetry operations in point group C∞v with the current along the rotational axis.…”

Section: Introductionmentioning

confidence: 99%

Are AuPdTM (T = Sc, Y and M = Al, Ga, In), Heusler Compounds Superconductors without Inversion Symmetry?

et al. 2019

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Heusler compounds with 2:1:1 stoichiometry either have a centrosymmetric Cu 2 MnAl structure or an Li 2 AgSb structure without a centre of inversion. The centrosymmetry is always lost in quaternary Heusler compounds with 1:1:1:1 stoichiometry and LiMgPdSn structure. This presents the possibility of realizing non-centrosymmetric superconductors in the family of Heusler compounds. The objective of this study is to search for and investigate such quaternary derivatives of Heusler compounds, particularly with respect to superconductivity. Several compounds were identified by carrying out calculations from first principles and superconductivity was observed in experiments conducted on AuPdScAl and AuPtScIn at the critical temperatures of 3.0 and 0.96 K, respectively. All investigated compounds had a valence electron count of 27, which is also the case in centrosymmetric Heusler superconductors.

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“…Therefore, it is started with symmetry considerations for magnetic systems. The importance of using correct symmetries for magnetic phenomena in solids was singled out in detail by Cracknell and Joshua 9,10. Main implications of the magnetic symmetry on the crystal eigenstates are:…”

Section: Space‐group Symmetry Reduction Related To Ordering Phenomenamentioning

confidence: 99%

Cover Picture: Structure–Performance Correlation of Nanocellulose‐Based Polymer Electrolytes for Efficient Quasi‐solid DSSCs (ChemElectroChem 8/2014)

et al. 2014

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DSSCs go green: The front cover artwork was chosen to show that an innovative biocomposite polymer electrolyte, obtained by incorporation of truly natural, renewable, and recyclable nanoscale, microfibrillated cellulose into a photo-curable methacrylicbased polymeric network, can be obtained and used in quasi-solid state dye sensitized solar cells. By the cumulative effect of the strategic components employed and the fine tuning of the experimental conditions, C. Gerbaldi et al. are able to achieve remarkable efficiencies up to 7.0 % under 1 sun irradiation (8.25 % under 0.4 sun).

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Group theory and magnetic phenomena in solids

Cited by 38 publications

References 77 publications

Control of antiferromagnetic domain distribution via polarization-dependent optical annealing

Control of antiferromagnetic domain distribution via polarization-dependent optical annealing

Are AuPdTM (T = Sc, Y and M = Al, Ga, In), Heusler Compounds Superconductors without Inversion Symmetry?

Cover Picture: Structure–Performance Correlation of Nanocellulose‐Based Polymer Electrolytes for Efficient Quasi‐solid DSSCs (ChemElectroChem 8/2014)

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