Magnetic phase diagrams of the HoRh T′ Si2 (T′ = Ru, Pd) systems

A new sample of HoPd2Si2 (ThCr2Si2-type structure, space group I4/mmm) has been prepared and investigated. Magnetic susceptibility and magnetization data indicate antiferromagnetic behaviour below TN = 5.8 K. On the basis of powder neutron diffraction data the magnetic structure of the compound has been redefined and found to be more complex than reported earlier. In the temperature region from 20 K to 5 K a short-range magnetic order develops. Between 1.5 K and 5 K a long-range magnetic ordering, that could be described in an enlarged magnetic unit cell (am = 7a, bm = a and cm = 6c), is observed. A complex magnetic structure of sine-wave modulated type with two propagation vectors and Ho magnetic moments parallel to the b-axis is proposed. Moreover, a new attempt to understand the transition from long- to short-range magnetic ordering observed in some rare earth compounds with Pd is made.

Section: Powder Neutron Diffractionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 88%

Magnetic structure of HoPd₂Si₂redefined on the basis of new neutron diffraction data

Szytuła

Jaworska–Gołąb

Baran

et al. 2001

“…X-ray diffraction data indicate that also the HoRh 2−x Ru x Si 2 solid solution is formed over the whole composition range denoted by the index 0 x 2. As one may expect, the magnetic properties of transient compounds have been found to depend on the transition metal content x [4]. The boundary compounds of this system exhibit different magnetic structures: HoRh 2 Si 2 was found to be a collinear antiferromagnet characterized by the wave vector k = [0, 0, 1] with T N = 27 K [5] while HoRu 2 Si 2 shows a modulated antiferromagnetic order with k = [0.22, 0, 0] below T N = 19 K [6].…”

Section: Introductionmentioning

confidence: 85%

“…A neutron diffraction study has been therefore undertaken, supplemented by earlier [4] and new magnetometric measurements. In total, seven transient compounds of the HoRh 2−x Ru x Si 2 system were synthesized and investigated: x = 0.25, 0.50, 0.75, 1.00, 1.25, 1.50, 1.75.…”

Section: Introductionmentioning

confidence: 99%

Magnetic phase diagram of the solid solution

Baran¹,

Hofmann²,

Leciejewicz³

et al. 1998

The magnetic phase diagram of the solid solution (-type crystal structure) has been established based on neutron diffraction data collected for seven intermediate compositions and supplemented by magnetometric data. Collinear antiferromagnetic structures described by the wave vectors [0,0,1], [1/2,1/2,1/2] and [1/2,1/2,0] develop successively as the Ru concentration denoted by the index x rises from 0 to 0.75, followed by antiferromagnetic sine modulated structures with wave vectors , and observed in the concentration range 0.5 < x < 2.

“…The HoRh 2−x Pd x Si 2 solid solutions exist over the whole range of the dilution parameter x and all have the body-centred-tetragonal crystal structure of the ThCr 2 Si 2 type [2]. The magnetic properties of the parent compounds are quite different: HoRh 2 Si 2 is a collinear antiferromagnet of the AFI type [3].…”

Section: Introductionmentioning

confidence: 99%

Neutron diffraction and magnetization studies of pseudoternary HoRh2-xPdxSi2 solid solutions (0$\leq$x<2)

Jaworska–Gołąb

Gondek

Szytuła

et al. 2002

Neutron powder diffraction and magnetometric studies of the HoRh2-xPdxSi2 series of solid solutions (x = 0, 0.5, 0.75, 1.0, 1.5, 1.8) are reported. The intermetallics investigated crystallize in the body-centred-tetragonal ThCr2Si2-type structure (space group I4/mmm). All the samples order antiferromagnetically at low temperatures. For low values of the dilution parameter x a simple collinear antiferromagnetic structure of the AFI type is stable. Below TN the magnetic moments are parallel to the c-axis and then, below Tt, deflect forming an angle φ with the c-axis. Further replacement of Rh by Pd results in the development of a sine-wave-modulated magnetic structure with one two-component propagation vector and magnetic moments in the basal plane. For x = 1.8 a sine-wave-modulated structure similar to that reported for HoPd2Si2 (i.e. with a two-component propagation vector and magnetic moments parallel to the b-axis) was found.