Random Fields and the Partially Paramagnetic State ofCsCo0.83Mg0.17

Abstract

We have performed measurements of the critical neutron scattering on CsCo0.83Mg0.17Br3, a dilute stacked triangular lattice (STL) Ising antiferromagnet (AF). A two component line shape associated with the critical fluctuations appears at a temperature coincident with T(N1) observed in pure CsCoBr3. Such scattering is indicative of fluctuations in prototypical random field Ising model (RFIM) systems. The random field domain state arises in this case due to geometrical frustration within the STL Ising AF, which gives rise to a three sublattice Néel state, in which one sublattice is disordered. Magnetic vacancies nucleate AF domains in which the vacancies reside on the disordered sublattice thereby generating a RFIM state in the absence of an applied magnetic field.

Quasistationary criticality of the order parameter of the three-dimensional random-field Ising antiferromagnetFe0.85Zn0.15F2: A synchrotron x-ray scattering study

“…It is likely that such behavior is more generic in systems undergoing phase transitions in the presence of quenched disorder. Although Fe x Zn 1−x F 2 and its isomorphs in applied fields are the most characterized examples of the RFIM, other magnetic [38,39] and ferroelectric [31,40] systems, as well as manganites [41,42] …”

Magnetic order and fluctuations in the presence of quenched disorder in the kagome staircase system (Co1−xMgx)Fritsch1, Yamani2, Chang3 et al. 2012Phys. Rev. BSelf Cite7130View full textAdd to dashboardCite

“…However, there are interesting examples where this is not the case. One such example is the case of the stacked triangular lattice Ising-like antiferromagnet in the presence of quenched non-magnetic impurities, CsCo 1−x Mg x Br 3 , wherein the combination of antiferromagnetic exchange and triangular coordination leads the quenched magnetic vacancies to couple to the relevant order parameter as a random field 24 . In this paper, we present magnetization measurements on both polycrystalline and single crystalline samples of (Co 1−x Mg x ) 3 V 2 O 8 as well as elastic and inelastic neutron scattering measurements on single crystal (Co 1−x Mg x ) 3 V 2 O 8 with x = 0.029 and x = 0.194.…”

Coexistence of Long-Range Order and Spin Fluctuation in Geometrically Frustrated ClinoatacamiteCu2Cl(OH)3

“…These include noncollinear antiferromagnetic Néel states in a stacked triangular lattice RMnO 3 (where R is rare earth) [1,2], disordered cooperative paramagnetic states and spin liquid states (in the stacked triangular lattice CsCoBr 3 [3], kagomélike SrCr 4 Ga 8 O 19 etc., [4 -6], pyrochlores Tb 2 Ti 2 O 7 and Yb 2 Ti 2 O 7 [7,8]), spin glasslike states in the absence of chemical disorder (in honeycomb Li 4 MgReO 6 [9], pyrochlore Y 2 Mo 2 O 7 , and Dy 2 Ti 2 O 7 [10,11]), and materials with icelike spin order and large zero-point entropy such as pyrochlore Ho 2 Ti 2 O 7 [12] and Dy 2 Ti 2 O 7 [13].…”