Spin glass behavior in the disordered half-Heusler compound IrMnGa

Kroder, Johannes; Manna, Kaustuv; Kriegner, Dominik; Sukhanov, A. S.; Liu, Enke; Borrmann, Horst; Hoser, A.; Gooth, Johannes; Schnelle, Walter; Inosov, D. S.; Fecher, Gerhard H.; Felser, Claudia

doi:10.1103/physrevb.99.174410

Cited by 49 publications

(17 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here, although we cannot completely dismiss the minor loop effect as the origin of this hysteresis shift at 0.6 T because the field is not strong enough to saturate the magnetization [26], the robust bias after several training loops seems at odds with the minor loops. Moreover, if the displacement originates from a minor loop effect, the ZFC curve should be shifted as well [2], which is not what we observed {see ZFC hysteresis loop at 2 K in Fig. S2(d) of the Supplemental Material with H c where no displacement is found [22]}.…”

Section: Resultscontrasting

confidence: 59%

“…Experimentally, one characteristic of this metastable state is the bifurcation in the zero-field-cooled (ZFC) and fieldcooled (FC) magnetization curves below T f , as seen in many spin glasses such as IrMnGa [2], Ni-Mn-X (X = Sb, Sn, In) alloys [3,4], etc. Another typical signature of spin-glass behavior is the peak structure in the vicinity of T f of the ac susceptibility (both its real part and imaginary part), which shifts as the frequency of the alternating magnetic field varies.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Coupling between antiferromagnetic and spin-glass orders in the quasi-one-dimensional iron tellurideTaFe1+xTe3(x=0.25

Liu

Bao

et al. 2021

Phys. Rev. B

View full text Add to dashboard Cite

Understanding the interplay among different magnetic exchange interactions and its physical consequences, especially in the presence of itinerant electrons and disorder, remains one of the central themes in condensed matter physics. In this vein, the coupling between antiferromagnetic and spin-glass orders may lead to large exchange bias, a property with potential broad technological applications. In this paper, we report the coexistence of antiferromagnetic order and spin-glass behaviors in the quasi-one-dimensional iron telluride TaFe 1+x Te 3 (x = 0.25). Its antiferromagnetism is believed to arise from the antiferromagnetic interchain coupling between the ferromagnetically aligned FeTe chains along the b axis, while the spin-glassy state stems from the disordered Fe interstitials. This dichotomic role of chain and interstitial sublattices is responsible for the large exchange bias observed at low temperatures, with the interstitial Fe acting as the uncompensated moment and its neighboring Fe chain providing the source for its pinning. This iron-based telluride may thereby represent a paradigm to study the large family of transition metal chalcogenides whose magnetic order or even dimensionality can be tuned to a large extent, forming a fertile playground to manipulate or switch the spin degrees of freedom thereof.

show abstract

Section: Resultscontrasting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Coupling between antiferromagnetic and spin-glass orders in the quasi-one-dimensional iron tellurideTaFe1+xTe3(x=0.25

Liu

Bao

et al. 2021

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…On the other hand, β < 1 implies the presence of the distribution of non-uniform energy barriers, typically observed for SG and superparamagnetic systems. [22,24,74,76] The M (t) curves for T = 70 K, 10 K, and 2 K are well fitted by Eq. ( 32), yielding β 0.48, 0.38, and 0.37, respectively.…”

Section: Magnetic Relaxationmentioning

confidence: 82%

Unconventional superparamagnetic behavior in the modified cubic spinel compound LiNi$_{0.5}$Mn$_{1.5}$O$_{4}$

Islam,

Singh,

Somesh

et al. 2020

Preprint

View full text Add to dashboard Cite

Structural, electronic, and magnetic properties of modified cubic spinel compound LiNi0.5Mn1.5O4 are studied via x-ray diffraction, resistivity, DC and AC magnetization, heat capacity, neutron diffraction, 7 Li nuclear magnetic resonance, magnetocaloric effect, magnetic relaxation, and magnetic memory effect experiments. We stabilized this compound in a cubic structure with space group P 4332. It exhibits semiconducting character with an electronic band gap of ∆/kB 0.4 eV. The interaction within each Mn 4+ and Ni 2+ sub-lattice and between Mn 4+ and Ni 2+ sublattices is found to be ferromagnetic (FM) and antiferromagnetic (AFM), respectively. This leads to the onset of a ferrimagnetic transition at TC 125 K. The reduced values of frustration parameter (f ) and ordered moments reflect magnetic frustration due to competing FM and AFM interactions. From the 7 Li NMR shift vs susceptibility plot, the average hyperfine coupling between 7 Li nuclei and Ni 2+ and Mn 4+ spins is calculated to be ∼ 672.4 Oe/µB. A detailed critical behaviour study is done in the vicinity of TC using modified-Arrott plot, Kouvel-Fisher plot, and universal scaling of magnetization isotherms. The magnetic phase transition is found to be second order in nature and the estimated critical exponents correspond to the 3D XY universality class. A large magneto-caloric effect is observed with a maximum value of isothermal change in entropy ∆Sm −11.3 J/Kg-K and a maximum relative cooling power of RCP 604 J/Kg for 9 T magnetic field change. The imaginary part of the AC susceptibility depicts a strong frequency dependent hump at T = T f2 well below the blocking temperature T b 120 K. The Arrhenius behaviour of frequency dependent T f2 and the absence of ZFC memory confirm the existence of superparamagnetism in the ferrimagnetically ordered state.

show abstract

“…The Heusler alloys generally have two variants of stoichiometric compositions: the half-Heusler compound with generic formula of XYZ [52][53][54][55][56][57] and the full Heusler compound X 2 YZ [5,58,59], where X and Y are from transition metal elements and Z from main group elements. In both half and full Heusler alloys, they normally crystalize in a cubic structure yet with different configurations [60]: non-centrosymmetric cubic structure C1 b for half-Heusler; two different types for full Heusler: the Cu 2 MnAl structure with space group Fm3m, also known as L2 1 -type, and the Hg 2 CuTi structure with space ground F43m, also known as "inverse structure" or XA-type.…”

Section: Crystal Structure and Equilibrium Latticementioning

confidence: 99%

Theoretical Study of the Electronic and Magnetic Properties and Phase Stability of the Full Heusler Compound Pd2CoAl

et al. 2019

View full text Add to dashboard Cite

Based on first principles calculation, a systematical investigation has been performed to study the electronic, magnetic, dynamic, and mechanical properties of the full Heusler compound Pd2CoAl. It is found that the L21-type structure is energetically more stable than the XA-type due to the lower total energy. The obtained lattice constant in cubic ground state is 6.057 Å, which matches well with previous study. The calculated electronic band structure reveals the metallic nature of Pd2CoAl and its total magnetic moment of 1.78 μB is mainly contributed by Co atom from strong spin splitting effect, as indicated with the distinctive distributions of the density of states in two spin directions. Under uniform strains from −5% to +5%, the variation of total magnetic moment has been obtained and it is still caused by the much larger change from Co atom, compared with Pd and Al atoms. The tetragonal structure has further been analyzed and we found that there is possible martensitic phase transformation because the total energy can be further reduced when the cubic structure is varied into the tetragonal one. The large energy difference of 0.165 eV between the tetragonal and cubic phases is found at the c/a ratio of 1.30. The total density of states has been compared between the cubic and tetragonal phases for Pd2CoAl and results show tetragonal phase transformation could reduce the states at the Fermi energy level in both directions. In addition, the dynamic and mechanical stabilities have also been evaluated for Pd2CoAl in both cubic and tetragonal structures and results confirm that the tetragonal phase shows good stability against the cubic phase, which further verifies that the tetragonal phase transformation is highly expected. In the end, the strong elastic anisotropy in the tetragonal structure has been clearly shown with the calculated directional dependence of the Young’s modulus and shear modulus.

show abstract

Spin glass behavior in the disordered half-Heusler compound IrMnGa

Cited by 49 publications

References 67 publications

Coupling between antiferromagnetic and spin-glass orders in the quasi-one-dimensional iron tellurideTaFe1+xTe3(x=0.25

Coupling between antiferromagnetic and spin-glass orders in the quasi-one-dimensional iron tellurideTaFe1+xTe3(x=0.25

Unconventional superparamagnetic behavior in the modified cubic spinel compound LiNi$_{0.5}$Mn$_{1.5}$O$_{4}$

Theoretical Study of the Electronic and Magnetic Properties and Phase Stability of the Full Heusler Compound Pd2CoAl

Contact Info

Product

Resources

About