Magnetic Phase Diagram and Adiabatic Magnetization Cooling of Quasi-One-Dimensional Antiferromagnets (CH3)3NHMnX3·2H2O (X: Cl, Br)

Takeda, Kazuyoshi; Koike, Tomoyuki; Harada, Issei; Tonegawa, Takashi

doi:10.1143/jpsj.51.85

Cited by 11 publications

(6 citation statements)

References 22 publications

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“…It has been found [160][161][162] that g is isotropic, but that the zero-field splitting parameter 0 takes the rather large value of -0.368cm-1 (-0.53K) for [(CH3)3NH]MnBr3·2H20; it is about three times smaller for the chloride. Broad maxima are observed in the specific heat, which again are evidence ofa high degree of short-range order.…”

Section: Lower Dimensional Magnetismmentioning

confidence: 99%

“…Broad maxima are observed in the specific heat, which again are evidence ofa high degree of short-range order. The phase diagrams of both the chloride and the bromide have been reported [162]. It has been found [160][161][162] that g is isotropic, but that the zero-field splitting parameter 0 takes the rather large value of -0.368cm-1 (-0.53K) for [(CH3)3NH]MnBr3·2H20; it is about three times smaller for the chloride.…”

Section: Lower Dimensional Magnetismmentioning

confidence: 99%

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Lower Dimensional Magnetism

Carlin¹

1986

Magnetochemistry

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Much of what has gone heretofore could come under the classification of short-range order. Certainly the intracluster magnetic exchange in Chap. 5 falls within this heading, and a significant part of the discussion of Chap. 6 also dealt with this subject. By "shortrange order," we shall mean the accumulation of entropy in a magnetic system above the long-range ordering temperature. Though this occurs with all magnetic systems, the physical meaning implied by the chapter title is that magnetic ions are assumed here to interact only with their nearest neighbors in a particular spatial sense. For operational purposes, the term will be restricted to magnetic interactions in one and two (lattice) dimensions. In that regard, it is interesting to note that the discussion is thereby restricted to the paramagnetic region. Let it be clear right at the beginning that this magnetic behavior follows directly from the structure of the various compounds.The study of magnetic systems which display large amounts of order in but one or two dimensions has been one of the most active areas recently in solid state physics and chemistry [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The reason for this seems to be that, though Ising investigated the theory of ordering in a one-dimensional ferromagnet as long ago as 1925 [21], it was not until recently that it was realized that compounds existed that really displayed this short-ranged order. The first substance recognized as behaving as a linear chain or onedimensional magnet is apparently CU(NH3)4S0 4' H 20 (CTS). Broad maxima at low temperatures were discovered in measurements of both the susceptibilities and the specific heat [22]. Griffith [23] provided the first quantitative fit of the data, using the calculations for a linear chain of Bonner and Fisher [24]. Fortunately, the theoreticians had been busy already for some time [4] in investigating the properties of onedimensional systems, so that the field has grown explosively once it was recognized that experimental realizations could be found. One-Dimensional or Linear Chain SystemsThere are very good theories available which describe the thermodynamic properties of one-dimensional (lD) magnetic systems, at least for 9'=t; what may be more surprising is that there are extensive experimental data as well of metal ions linked into uniform chains.The first point ofinterest, discovered long ago by Ising [21], is that an infinitely long ID system undergoes long-range order only at the temperature of absolute zero.R. L. Carlin, Magnetochemistry

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Section: Lower Dimensional Magnetismmentioning

confidence: 99%

Section: Lower Dimensional Magnetismmentioning

confidence: 99%

Lower Dimensional Magnetism

Carlin¹

1986

Magnetochemistry

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“…Similarly, the internal C1(1)-M-C1(2) angles decrease from 85.28°( Mn) to 84.29°( Ni) as the bridging M-Cl-M angles increase from 94.83 and 92.13°( Mn) to 95.84 and 93.35°( Ni). The effect of the alteration of angle plus the decrease in the M-M distance means the Cl(l)-Cl(2) distance shortens severely: 3.485 Á (Mn), 3.385 Á (Fe), 3.334 A (Co), and 3.273 A (Ni).…”

Section: Resultsmentioning

confidence: 99%

“…The series of isostructural 3d M(II) linear-chain compounds [(CH3)3NH]MC13-2H2Q (abbreviated as MTAC), for = Mn, Fe, Co, Ni, and Cu, has been thoroughly studied. [1][2][3][4][5][6][7][8][9][10][11] All of the compounds consist of dichloro-bridged chains of M2+ ions, held together into layers by hydrogen bonding to a noncoordinated chloride ion. The resulting layers are well separated by the bulk of the trimethylammonium ions.…”

Section: Introductionmentioning

confidence: 99%

A bromide analog of a one-dimensional Ising ferromagnet: trimethylammonium catena-bis(.mu.-bromo)diaquoiron(II) bromide

Greeney¹,

Landee²,

Zhang³

et al. 1990

Inorg. Chem.

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The crystal structure of the title compound, FeTAB, has been determined by X-ray diffraction and has been found to be isomorphous to that of the chloride analogue, FeTAC. The structure consists of chains of bibromide-bridged Fe2+ ions extending along the b axis of the orthorhombic unit cell (space group Pnma, a = 17.287 (3) Á, b = 7.651 (2) Á, c = 8.320 (3) Á, R(Fa) = 0:0494, RW(F0) = 0.0488). The chains are linked into a 2-dimensional network in the c direction by hydrogen bonding to a third bromide ion; the resulting planes are well isolated in the a direction by the organic molecules. The low-temperature magnetic susceptibility of polycrystalline samples can be modeled by using a one-dimensional ferromagnetic Ising model with a molecular field correction.The exchange parameters are estimated to be Jjk = 4 K and z'J'/k = -0.2 K, indicating that FeTAB has an intrachain exchange constant only one-fourth of that found in the chloride analogue while the interchain interactions are more than 10-times greater. Antiferromagnetic ordering is observed in the Móssbauer spectra near 1.3 K. Analysis of the polycrystalline spectra shows that the internal magnetic field (and easy axis of magnetization) for FeTAB lies close to the ab plane, as previously found for FeTAC.

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of superconducting bismuth lead strontium calcium copper oxides[(Bi,Pb)2Sr2Ca2Cu3] oxides with Tc above 110 K by coprecipitation in triethylamine media

Shei¹,

Liu²,

Chen³

et al. 1990

Inorg. Chem.

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Bi(Pb)-Sr-Ca-Cu-0 superconducting powders were prepared from an aqueous solution containing Bi, Pb, Sr, Ca, and Cu salts and oxalic acid via coprecipitation using triethylamine as a base. The dried precipitate was found to have satisfactory stoichiometry and a particle size of 0.3 Mm. Subsequent calcination at 800 °C for 12 h and sintering at 860 °C for 72 h yield superconducting with Tc above 110 K. This process can be employed in a large-scale preparation of the Bi(Pb)-Sr-Ca-Cu-0 superconducting powder.

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Magnetic Phase Diagram and Adiabatic Magnetization Cooling of Quasi-One-Dimensional Antiferromagnets (CH₃)₃NHMnX₃·2H₂O (X: Cl, Br)

Cited by 11 publications

References 22 publications

Lower Dimensional Magnetism

Lower Dimensional Magnetism

A bromide analog of a one-dimensional Ising ferromagnet: trimethylammonium catena-bis(.mu.-bromo)diaquoiron(II) bromide

Preparation and characterization of superconducting bismuth lead strontium calcium copper oxides[(Bi,Pb)2Sr2Ca2Cu3] oxides with Tc above 110 K by coprecipitation in triethylamine media

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