Magnetic compensation in the bimetallic oxalates

Reis, Peter; Fishman, Randy Scott; Reboredo, Fernando A.; Moreno, Juana

doi:10.1103/physrevb.77.174433

Cited by 13 publications

(9 citation statements)

References 15 publications

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“…Within the rM S ,M L i basis, ĤSOC is represented by a diagonal 10 Â 10 matrix with elements À(z/4)M S M L (M S ¼ 0, AE1, AE2 and M L ¼ AE2). [58][59][60][61] The parameter z is the effective one-electron SOC 'constant' for Fe II (see ref. 17 and 62 for a detailed discussion).…”

Section: Ligand Eld Considerationsmentioning

confidence: 99%

A theoretical analysis of chemical bonding, vibronic coupling, and magnetic anisotropy in linear iron(ii) complexes with single-molecule magnet behavior

et al. 2013

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Section: Ligand Eld Considerationsmentioning

confidence: 99%

A theoretical analysis of chemical bonding, vibronic coupling, and magnetic anisotropy in linear iron(ii) complexes with single-molecule magnet behavior

et al. 2013

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“…3,17 The critical behaviour near first-order magnetoelastic transitions can be controlled by changing chemical composition or annealing conditions. [15][16][17][18]21 Importantly, the thermal hysteresis can be often tuned to reach small values while maintaining a large magnetocaloric effect. 15,16 Consequently, first-order magnetoelastic transitions provide a promising venue for producing magnetocaloric materials that could be used as magnetic refrigerants operating at high thermal cycling frequencies.…”

Section: Introductionmentioning

confidence: 99%

Complex magnetic phase diagram of metamagnetic MnPtSi

Gamża

Schnelle²,

Rösner³

et al. 2019

Phys. Rev. B

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The magnetic, thermal and transport properties as well as electronic band structure of MnPtSi are reported. MnPtSi is a metal that undergoes a ferromagnetic transition at TC = 340(1) K and a spin-reorientation transition at TN = 326(1) K to an antiferromagnetic phase. First-principles electronic structure calculations indicate a not-fully polarized spin state of Mn in a d 5 electron configuration with J = S = 3/2, in agreement with the saturation magnetization of 3 µB in the ordered state and the observed paramagnetic effective moment. A sizeable anomalous Hall effect in the antiferromagnetic phase alongside the computational study suggests that the antiferromagnetic structure is non-collinear. Based on thermodynamic and resistivity data we construct a magnetic phase diagram. Magnetization curves M (H) at low temperatures reveal a metamagnetic transition of spin-flop type. The spin-flopped phase terminates at a critical point with Tcr ≈ 300 K and Hcr ≈ 10 kOe, near which a peak of the magnetocaloric entropy change is observed. Using Arrott plot analysis and magnetoresistivity data we argue that the metamagnetic transition is of a firstorder type, whereas the strong field dependence of TN and the linear relationship of the TN with M 2 hint at its magnetoelastic nature.

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“…The system we study is CoMnSi, a metallic antiferromagnet.We previously observed a large MCE in CoMnSi, a metamagnet that has a field-and temperature-induced transition from a low temperature, non-collinear incommensurate helical antiferromagnetic (AFM) state to a high magnetisation state [4]. CoMnSi is structurally similar to MnP, a system in which the field-dependence of non-collinear magnetic states has been well studied [5] and in which a rare Lifshitz tricritical point is seen [6]. However the similarity of the magnetic structures in MnP and in CoMnSi is not so well known, due to a lack of single crystals and of temperature-dependent neutron diffraction data.…”

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confidence: 99%

Giant Magnetoelastic Coupling in a Metallic Helical Metamagnet

et al. 2010

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Using high resolution neutron diffraction and capacitance dilatometry we show that the thermal evolution of the helimagnetic state in CoMnSi is accompanied by a change in inter-atomic distances of up to 2%, the largest ever found in a metallic magnet. Our results and the picture of competing exchange and strongly anisotropic thermal expansion that we use to understand them sheds light on a new mechanism for large magnetoelastic effects that does not require large spin-orbit coupling.PACS numbers: 65.40. De, 61.05.fm, 75.80.+q, 64.60.Kw Most materials change shape in a magnetic field. Usually the effect, and the so-called magneto-elastic interaction from which it derives are small, especially away from a phase transition. However, large magneto-elastic interactions are crucial to a range of new, technological materials in which multiple order parameters exist simultaneously and are coupled. These include ferromagnetic shape memory materials [1], multiferroics [2], and magnetic refrigerant materials [3]. Despite their relevance, atomically-resolved observations of large magneto-elastic effects within a given crystal structure are very rare.Giant magneto-elastic coupling was recently observed in multiferroic hexagonal manganites [2], where it is two orders of magnitude larger than in any other magnetic material. In those compounds it is believed to be central to magneto-electric coupling and multi-ferroicity and is thought to arise, unusually, from strongly varying exchange interactions where the co-ordination of Mn atoms in MnO 5 trigonal bipyramids removes the orbital degeneracy and Jahn-Teller mechanism typically found in MnO 6 -derived structures. Here we show that exchangederived giant magneto-elastic interactions are not limited to multiferroic oxides, but may be much more general, if one examines materials that possess competing exchange interactions relieved by temperature or applied field. The system we study is CoMnSi, a metallic antiferromagnet.We previously observed a large MCE in CoMnSi, a metamagnet that has a field-and temperature-induced transition from a low temperature, non-collinear incommensurate helical antiferromagnetic (AFM) state to a high magnetisation state [4]. CoMnSi is structurally similar to MnP, a system in which the field-dependence of non-collinear magnetic states has been well studied [5] and in which a rare Lifshitz tricritical point is seen [6]. However the similarity of the magnetic structures in MnP and in CoMnSi is not so well known, due to a lack of single crystals and of temperature-dependent neutron diffraction data. Here we focus on the iso-structural evolution of the crystal lattice within the helical groundstate of CoMnSi. We show that, within the AFM state and well below the zero field Néel temperature there is a giant, and opposing, change in the two shortest Mn-Mn distances, of around 2%. This change has two consequences. Firstly it brings about an Invar-like effect in sample volume in zero magnetic field. Secondly, it couples strongly to the suppresion of helimagn...

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Magnetic compensation in the bimetallic oxalates

Cited by 13 publications

References 15 publications

A theoretical analysis of chemical bonding, vibronic coupling, and magnetic anisotropy in linear iron(ii) complexes with single-molecule magnet behavior

A theoretical analysis of chemical bonding, vibronic coupling, and magnetic anisotropy in linear iron(ii) complexes with single-molecule magnet behavior

Complex magnetic phase diagram of metamagnetic MnPtSi

Giant Magnetoelastic Coupling in a Metallic Helical Metamagnet

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