Magnetocaloric effect and magnetoresistance correlation in Ge-doped Mn<sub>2</sub>Sb

Singh, Vikram; Kumar, Rohit; Bag, Pallab; Rawat, R.; Kushwaha, Pallavi

doi:10.1088/2053-1591/1/4/046101

Cited by 15 publications

(4 citation statements)

References 29 publications

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“…This also suggests the itinerant character of 3d electrons in the studied compound. The identical behaviour of M R and M CE across the magnetic transition is previously reported in different intermetallic compounds with itinerant character [46,[51][52][53][54][55].…”

Section: Resistivity and Magnetoresistancesupporting

confidence: 84%

Negative thermal expansion and itinerant ferromagnetism in Mn$_{1.4}$Fe$_{3.6}$Si$_{3}$

Singh,

Nath

2021

Preprint

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We report the thermal expansion, critical behavior, magnetocaloric effect (MCE), and magnetoresistance (M R) on the polycrystalline Mn1.4Fe3.6Si3 compound around the ferromagnetic transition. A large negative volume thermal expansion (αV ∼ −20 × 10 −6 K −1 ) is observed across the transition temperature with a strong anisotropic variation of lattice parameters in the ab-plane. The anisotropic magnetoelasticity arises from the competition between magnetic ordering and structural deformation which could be responsible for the large MCE (∆Sm ≃ −6 J/Kg-K) across the magnetic transition in this compound. The large and negative M R (∼ −3% in 80 kOe) is also observed at the transition temperature which can be attributed to the suppression of spin disorder. Further, the Rhodes-Wolfarth ratio (RWR > 1) and identical field dependence of M R and MCE isotherms indicate the itinerant character of the 3d electrons. The critical exponents determined from the analysis of magnetization and MCE are consistent with the quasi-two-dimensional (2D) Ising model with long range exchange interactions which decays as J(r) ∼ r −3.41 . This unconventional quasi-2D Ising character with long-range interactions can be ascribed to strong ab-plane anisotropy and the delocalized 3d electrons in the studied compound.

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Section: Resistivity and Magnetoresistancesupporting

confidence: 84%

Negative thermal expansion and itinerant ferromagnetism in Mn$_{1.4}$Fe$_{3.6}$Si$_{3}$

Singh,

Nath

2021

Preprint

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“…The composition around x = 0.1 has been studied due to its near room temperature T t and associated MR and magnetocaloric effect. 12,13 On the other hand we could not find any report on compositions with x < 0.05. Here we present our systematic investigation of FRI-AFM transition in Ge substituted Mn 2 Sb.…”

Section: Introductioncontrasting

confidence: 71%

“…Cr, V, Co, Cu, Zn) at Mn site, T C decreases, and at low temperatures a first order ferrimagnetic (FRI) to antiferromagnetic (AFM) transition is observed. [4][5][6][7][8][9][10][11] The FRI-AFM transition is also observed for As, Sn, Ge substitution for Sb, 12,13 which suggest that rather than magnetic ion dilution, the origin of this transition could be structural or electronic or both. In fact, both resistivity and lattice parameters are reported to show large variation across FRI-AFM transition.…”

Section: Introductionmentioning

confidence: 95%

“…Due to strong coupling between spin, charge and lattice, these systems show many functional properties like giant magnetoresistance (MR), magnetostriction, magnetocaloric effect (MCE) etc. 9,[12][13][14][15][16][17][18] A survey of the phase diagrams of Mn 2 Sb with dopant concentration shows that FRI-AFM transition temperature (T t ) is either absent or higher than 100 K. 4,6,17 Even though, there appears to be some discrepancies in T t vs. dopant concentration for most of the dopant, the results from independent groups are more or less consistent for Cr substitution at Mn site and Ge substitution at Sb site. [4][5][6][7][8][9][10][11][12][13][14][15][16][19][20][21][22][23][24][25][26][27] Both, leads to decrease in one conduction electron per atom substitution as well as decrease in unit cell volume and T t increases from around 75 K to room temperature.…”

Section: Introductionmentioning

confidence: 99%

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Giant negative magnetoresistance and kinetic arrest of first-order ferrimagnetic-antiferromagnetic transition in Ge doped Mn2Sb

Singh

Karmakar

Rawat

et al. 2019

Journal of Applied Physics

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Effect of Ge substitution on first order ferrimagnetic (FRI) -antiferromagnetic (AFM) transition in Mn2Sb has been studied. It shows that transition temperature (Tt) can be tuned between 119 K -271 K by substituting 2.5-10% Ge at Sb site in Mn2Sb. The variation of density of state at Fermi level N(E f ) with Ge substitution shows that dN(E)/dE is positive at E f in the AFM state. With the application of magnetic field Tt shifts to low temperature, which results in a giant negative magnetoresistance (MR) reaching a value of 70% for 2.5% substitution. Our results show that FRI to AFM transformation during cooling stops around 35 K, even though it remains incomplete. It along with non-monotonic variation of lower critical field, open loop in isothermal MR and increasing difference in zero field cooled warming (ZFCW) and field cooled warming (FCW) resistivity with increasing magnetic field shows that FRI to AFM transition is kinetically arrested in the case of 2.5% Ge substitution.

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On Hysteresis and Magnetocaloric Effect in CoS$$_{1.76}$$Se$$_{0.24}$$

Karmakar,

Joshi,

Kumar

et al. 2024

J Supercond Nov Magn

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Magnetocaloric effect and magnetoresistance correlation in Ge-doped Mn₂Sb

Cited by 15 publications

References 29 publications

Negative thermal expansion and itinerant ferromagnetism in Mn$_{1.4}$Fe$_{3.6}$Si$_{3}$

Negative thermal expansion and itinerant ferromagnetism in Mn$_{1.4}$Fe$_{3.6}$Si$_{3}$

Giant negative magnetoresistance and kinetic arrest of first-order ferrimagnetic-antiferromagnetic transition in Ge doped Mn2Sb

On Hysteresis and Magnetocaloric Effect in CoS$$_{1.76}$$Se$$_{0.24}$$

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Magnetocaloric effect and magnetoresistance correlation in Ge-doped Mn2Sb

Cited by 15 publications

References 29 publications

Negative thermal expansion and itinerant ferromagnetism in Mn$_{1.4}$Fe$_{3.6}$Si$_{3}$

Negative thermal expansion and itinerant ferromagnetism in Mn$_{1.4}$Fe$_{3.6}$Si$_{3}$

Giant negative magnetoresistance and kinetic arrest of first-order ferrimagnetic-antiferromagnetic transition in Ge doped Mn2Sb

On Hysteresis and Magnetocaloric Effect in CoS$$_{1.76}$$Se$$_{0.24}$$

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Magnetocaloric effect and magnetoresistance correlation in Ge-doped Mn₂Sb