Optical investigation of the metamagnetic properties of Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cl</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Griffin, James J.; Schnatterly, S. E.; Farge, Y.; Régis, M.; Fontana, M. P.

doi:10.1103/physrevb.10.1960

Cited by 49 publications

(5 citation statements)

References 13 publications

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“…The metamagnet must have important ferromagnetic interactions, even though the overall magnetic structure will be antiferromagnetic. Tricritical points have been observed in FeCl 2 by means of magnetic circular dichroism [121,122] and in CsCoC1 3 • 2 D 2 0 by neutron measurements [123]. 7.53b, it consists of a set of first-order points at low temperature which, at the tricritical point, goes over into a set of second-order points.…”

Section: Metamagnetismmentioning

confidence: 99%

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: Metamagnetismmentioning

confidence: 99%

Lower Dimensional Magnetism

Carlin¹

1986

Magnetochemistry

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“…The rather large intrinsic Faraday rotation of 0.1 deg/mm x Oe in Fe O 1MgO 7C12 allows to perform accurate studies on typically Imm thick-platelets. The good homogeneity of the samples were checked by Faraday rotation and by means of differential polarized light scattering, also called TMCD [12,13]. This last technique is able to evidence small magnetic inhomogeneities(typically 10-5mm in size) in such.…”

Section: Methodsmentioning

confidence: 99%

Magnetooptics in Spin Glasses

1987

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Magnetooptics we used successfully to deduce the static and dynamic magnetic properties of insulating spin glasses. The Faraday rotation stands as the only available technique to perform dynamical measurements of the magnetization over a very wide time range or of the susceptibility over an extended frequency range. Very recently, Faraday rotation measurements of the phase 1ag of the a.c. susceptibi1itY,with respect to the .modu1ated fie1d~have been sUccessfully used to give the first evidence of a transition at finite temperature in the 3d spin glass Eu 4SrO 6S [I]. In this paper, we report on the first dynamic studies of a 2d-Ising insulating spin g2ass :' Fe O 3MgO C1 2 . The in-phase (X~) and out of phase (X~) comRonents of the susceptibility were measured at low' temperature in the frequency range 1.5

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“…They were collected and processed by microcomputer. Measurements of the TMCD [15] were performed with the same apparatus, omitting the analyzer and measuring the first harmonic of the PMT signal, Iw' 3. RESULTS AND DISCUSSION Fig.…”

Section: Methodsmentioning

confidence: 99%

“…In this paper we shall present the complete magnetic phase diagram of FeO.7MgO.3Cl2 using FR and "transparent" magnetic circular dichroism (TMCD), both of which are well-known techniques from earlier experiments on pure FeCl2 [14,15]. The results will be compared with partial H-T diagrams obtained from light scattering in the mixed paramagnetic-antiferromagnetic phase [9].…”

Section: Introductionmentioning

confidence: 99%

FARADAY ROTATION OF THE RANDOM FIELD ISING MODEL SYSTEM Fe0.7Mg0.3Cl2

Leitão¹,

Kleemann²

1987

J. Magn. Soc. Jpn.

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Faraday rotation and magnetic circular dichroism were used to determine the magnetic phase diagram of FeO.7MgO.3Cl2 in an axial magnetic field. The tricritical point appears well-defined (Hi,t-O.6 T, T t -8.5 K) provided that the data are taken after zero-field cooling. Random field crossover is observed below Hi-O.4 T with an exponent ~=1.41±0.05 along with logarithmic divergences of (aM/aT)H and (aM/aH)T' The crossover into random field tricritical behavior is discussed with regard to recent theory.

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Optical investigation of the metamagnetic properties of FeCl2

Cited by 49 publications

References 13 publications

Lower Dimensional Magnetism

Lower Dimensional Magnetism

Magnetooptics in Spin Glasses

FARADAY ROTATION OF THE RANDOM FIELD ISING MODEL SYSTEM Fe0.7Mg0.3Cl2

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