Publications (22)
Exploring the best scenario for understanding the high temperature thermoelectric behaviour of Fe2VAl
Shamim Sk, P. Devi, Sanjay Singh +1
Heusler-type Fe2VAl compound is a promising thermoelectric candidate with non-magnetic ground state. The present work investigates the Seebeck coefficient (S) of Fe2VAl in the temp…
Intersection graph of cyclic subgroups of groups
R. Rajkumar, P. Devi
Let be a group. The intersection graph of cyclic subgroups of , denoted by , is a graph having all the proper cyclic subgroups of as its vertices and tw…
Reversible adiabatic temperature change in the shape memory Heusler alloy Ni2.2Mn0.8Ga: An effect of structural compatibility
P. Devi, M. Ghorbani Zavareh, C. Salazar Mejia +5
The large magnetocaloric effect (MCE) observed in Ni-Mn based shape-memory Heusler alloys put them forward to use in magnetic refrigeration technology. It is associated with a firs…
Gradual pressure-induced change in the magnetic structure of the non-collinear antiferromagnet MnGe
A. S. Sukhanov, Sanjay Singh, L. Caron +9
By means of powder neutron diffraction we investigate changes in the magnetic structure of the coplanar non-collinear antiferromagnet MnGe caused by an application of hydrostat…
Robust Bain distortion in the premartensite phase of platinum substituted Ni2MnGa magnetic shape memory alloy
Sanjay Singh, B. Dutta, S. W. DSouza +7
The premartensite phase of shape memory and magnetic shape memory alloys (MSMAs) is believed to be a precursor state of the martensite phase with preserved austenite phase symmetry…
Permutability graphs of subgroups of some finite non-abelian groups
R. Rajkumar, P. Devi
In this paper, we study the structure of the permutability graphs of subgroups, and the permutability graphs of non-normal subgroups of the following groups: the dihedral groups $D…
Adaptive modulation in Ni2Mn1.4In0.6 magnetic shape memory Heusler alloy
P. Devi, Sanjay Singh, B. Dutta K. Manna +10
The origin of incommensurate structural modulation in Ni-Mn based Heusler type magnetic shape memory alloys (MSMAs) is still an unresolved issue inspite of intense focus on this du…
Coprime graph of subgroups of a group
R. Rajkumar, P. Devi
Let be a group. We define the coprime graph of subgroups of , denoted by , is a graph whose vertex set is the set of all proper subgroups of , and two dist…
CoPtGa: A promising magnetic shape memory alloy with high martensite transition temperature
Tufan Roy, P. Devi, Sanjay Singh +2
In the present work, a combined theoretical and experimental study on CoPtGa Heusler alloy shows that it exhibits a martensite transition around 1320 K with a small thermal h…
Toroidality and projective-planarity of intersection graphs of subgroups of finite groups
R. Rajkumar, P. Devi
Let be a group. The intersection graph of subgroups of , denoted by , is a graph with all the proper subgroups of as its vertices and two distinct vertic…
Classification of finite groups with toroidal or projective-planar permutability graphs
R. Rajkumar, P. Devi, Andrei Gagarin
Let be a group. The permutability graph of subgroups of , denoted by , is a graph having all the proper subgroups of as its vertices, and two subgroups are adjace…
The Birth of a Major Coronal Mass Ejection with Intricate Magnetic Structure from Multiple Active Regions
Jinhan Guo, Y. W. Ni, B. Schmieder +9
Coronal mass ejections (CMEs) are the eruptions of magnetised plasma from the Sun and are considered the main driver of adverse space weather events. Hence, undrstanding its format…
Study of single crystalline SrAgSb and SrAuSb semimetals
P. Devi, Lin-Lin Wang, Caiden Abel +2
Given renewed interest in the electronic properties of semimetallic compounds with varying degrees of spin orbit coupling we have grown single crystals of SrAgSb and SrAuSb, measur…
Bounds on Spreads of Matrices related to Fourth Central Moment. II
R. Sharma, R. Kumar, R. Saini +1
We derive some inequalities involving first four central moments of discrete and continuous distributions. Bounds for the eigenvalues and spread of a matrix are obtained when all i…
Filament eruption deflection and associated CMEs
K. Koleva, R. Chandra, P. Duchlev +1
We present the observations of a quiescent filament eruption and its deflection from the radial direction. The event occurred in the southern solar hemisphere on 2021 May 9 and was…
Some generalisations of the inequalities for positive linear maps
R. Sharma, P. Devi, R. kumari
We obtain generalisations of some inequalities for positive unital linear maps on matrix algebra. This also provides several positive semidefinite matrices and we get some old and…
Effect of chemical and hydrostatic pressure on the coupled magnetostructural transition of Ni-Mn-In Heusler alloys
P. Devi, C. Salazar Mejia, L. Caron +3
Ni-Mn-In magnetic shape-memory Heusler alloys exhibit generally a large thermal hysteresis at their first-order martensitic phase transition which hinder a technological applicatio…
Improved magnetostructural and magnetocaloric reversibility in magnetic Ni-Mn-In shape-memory Heusler alloy by optimizing the geometric compatibility condition
P. Devi, C. Salazar Mejia, M. Ghorbani Zavareh +6
We report an improved reversibility of magnetostriction and inverse magnetocaloric effect (MCE) for the magnetic shape-memory Heusler alloy NiMnIn. We show…
Permutability graph of cyclic subgroups
R. Rajkumar, P. Devi
Let be a group. \textit{The permutability graph of cyclic subgroups of }, denoted by , is a graph with all the proper cyclic subgroups of as its vertices and tw…
Thermoelectric properties of FeVAl at high temperature region: A combined experimental and theoretical study
Shamim Sk, P. Devi, Sanjay Singh +1
Heusler type compounds have long been recognized as potential thermoelectric (TE) materials. Here, the experimentally observed TE properties of FeVAl are understood through e…
Improved crystallographic compatibility and magnetocaloric reversibility in Pt substituted Ni2Mn1.4In0.6 magnetic shape memory Heusler alloy
K. K. Dubey, P. Devi, Anupam K. Singh +1
We present here the improved crystallographic/geometric compatibility and magnetocaloric reversibility by measurement of magnetic entropy change using different protocols in 10% Pt…
Inclusion graph of subgroups of a group
P. Devi, R. Rajkumar
For a finite group , we define the inclusion graph of subgroups of , denoted by , is a graph having all the proper subgroups of as its vertices and two dis…