Neha Patel

@itbhu.ac.in

Neha Patel


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https://researchid.co/neha_patel

RESEARCH, TEACHING, or OTHER INTERESTS

Condensed Matter Physics
7

Scopus Publications

Scopus Publications

  • Highly entangled magnetodielectric coupling, magnetostriction, and spin-phonon coupling phenomena in Ni2ScSbO6
    Neha Patel, Arkadeb Pal, C. W. Wang, G. R. Blake, Samiul Sk, S. K. Panda, Swayangsiddha Ghosh, J. Khatua, T. W. Yen, Susaiammal Arokiasamy, H. S. Kunwar, Y. C. Lai, Y. C. Chuang, V. Sathe, Kwang-Yong Choi, H. D. Yang, Sandip Chatterjee
    Physical Review B, 2026
  • Multiple magnetic phases, spin-phonon coupling, and magnetocaloric effect in the non-centrosymmetric antiferromagnet Ni1.8Co0.2InSbO6
    Neha Patel, Srishti Dixit, Swayangsiddha Ghosh, Saroj Poudyal, Prashant Shahi, Yoshiya Uwatoko, Souvik Banerjee, A Sundaresan, Abhishek Misra, Sandip Chatterjee
    Journal of Physics D Applied Physics, 2025
    Non-centrosymmetric helical magnets are renowned for their exotic magnetic properties and their association with complex physical behaviors. Here, we investigate the trigonal Ni1.8Co0.2InSbO6 system (space group R3), revealing multiple fascinating characteristics. Magnetic studies demonstrate a long-range antiferromagnetic (AFM) transition at T N ∼ 80 K, a spin-glass state at T SG ∼ 25 K, and a non-Griffith phase above T N . A metamagnetic transition is observed at various fields, with the phase transition from a first-order to second-order with the increase of temperature. This transition is attributed to the interplay between ferromagnetic (FM) and AFM phases. Raman spectroscopy indicates spin–phonon coupling below T N , reflecting the impact of magnetic ordering on lattice dynamics. Magnetocaloric effect measurements further reveal AFM-to-FM phase transitions above critical magnetic fields. These findings emphasize the significance of spin-lattice interactions and metamagnetic behavior in this system.
  • Coexistence of Kondo effect and Weak anti-localization in Topological insulator/Ferromagnetic heterostructure
    Labanya Ghosh, Swayangsiddha Ghosh, Srishti Dixit, Mohd Alam, Neha Patel, Archana Tiwari, Prashant Shahi, Yoshiya Uwatoko, Sandip Chatterjee
    Applied Surface Science, 2024
  • Raman effect and unusual transport properties of Co-doped Mn2FeAl Heusler alloy
    Srishti Dixit, Swayangsiddha Ghosh, Neha Patel, Mohd Alam, Krishanu Bandyopadhyay, Nisha Shahi, Yogendra Kumar, M. Sawada, K. Shimada, Satyen Saha, Sanjay Singh, Sandip Chatterjee
    Epl, 2023
    Semiconducting materials with a distinctive blend of high electrical and low thermal conductivity are required for efficient thermoelectric devices. In this aspect, Heusler alloys are potential candidates for thermoelectric materials. It has been observed that Co doping in Mn2FeAl enhances the electrical conductivity as well as reduces the thermal conductivity of the system leading to an improvement in figure of merit. The Seebeck coefficient suggested the p-type behavior over the whole temperature range, followed by a maximum at 150 K. Additionally, the electronic properties of the suggest that the observed Raman mode is due to the electronic excitations in the system. Interestingly, this system shows a decoupling between the Seebeck coefficient and electrical conductivity, suggesting the promising potential of as a thermoelectric material and offering valuable insights into its electronic properties.
  • Existence of exotic magnetic phases along with exchange bias and memory effect in frustrated beta-Mn Heusler alloy
    Srishti Dixit, Labanya Ghosh, Mohd Alam, Satya Vijay Kumar, Neha Patel, Swayangsiddha Ghosh, Nisha Shahi, Sanjay Singh, Sandip Chatterjee
    Journal of Applied Physics, 2023
    Generally, Co-based Heusler alloys are the center of interest because of their properties such as high Curie temperature, spin polarization, and high value of exchange bias. Herein, we have used the macroscopic technique to probe the low-temperature exotic properties of M1.5Co0.5FeAl. First, we have analyzed the dc magnetization data, and it unfolds the presence of a glassy phase at 33 K. The cluster spin glass phase is authenticated by measuring ac susceptibility. Furthermore, using empirical models like power law and Vogel–Fulcher fitting, the relaxation time for the spin is of the order of τ ∼ 10−9 s, confirming the presence of a cluster spin glass in Mn1.5Co0.5FeAl below an irreversible temperature. The H–T phase space diagram ensures that it follows the Ising spin model. Furthermore, the glassy phase of the system is confirmed by magnetic relaxation, memory effect, and the presence of an exchange bias instead of a minor loop below spin-freezing temperature (Tf ∼ 33 K).
  • Interplay of spin, phonon, and lattice degrees in a hole-doped double perovskite: Observation of spin-phonon coupling and magnetostriction effect
    Arkadeb Pal, Khyati Anand, Neha Patel, Amitabh Das, Surajit Ghosh, Peter Tsung-Wen Yen, Shin-Ming Huang, R. K. Singh, H. D. Yang, A. K. Ghosh, Sandip Chatterjee
    Journal of Applied Physics, 2022
    Unlike a typical spin–phonon coupling, an exhibition of unconventional spin–phonon coupling, which is mediated via magnetostriction effect, is reported in a hole-doped double perovskite Pr1.5Sr0.5CoMnO6. Various investigations including electronic and crystal structures, spin structure, transport property, lattice dynamics, and theoretical density of states analysis by density-functional theory (DFT) have been performed. A substantial increase in the mean oxidation states of Co ions and a concurrent abrupt decrease in the resistivity upon Sr doping is observed, thus altering its underlying transport mechanism. An insulating and ferromagnetic (FM) ground state is predicted by DFT calculations. The neutron diffraction data analysis reveals a complex crystal structure of Pr1.5Sr0.5CoMnO6, which consists of B-site disordered monoclinic (P21/n) and orthorhombic (Pnma) structures, highlighting the presence of an anti-site disorder in the system. The analysis also suggests an overall FM ordering of Co/Mn spins below 150 K for the monoclinic phase, whereas no such magnetic ordering is found for the orthorhombic phase. More interestingly, the neutron powder diffraction study perceives the presence of a strong magnetostriction effect in the system. Raman spectroscopy unravels the presence of a spin–phonon coupling, which is essentially mediated by the magnetostriction effect.
  • Double glassy states and large spontaneous and conventional exchange bias in La1.5Ca0.5CoFeO6ferrimagnetic double perovskite
    Prajyoti Singh, Rahul K Singh, Srishti Dixit, Neha Patel, Mohd Alam, Sambhab Dan, A Jain, K Anand, Vinod K Gangwar, Rahul Singh, Amish G Joshi, S M Yusuf, Sandip Chatterjee
    Journal of Physics Condensed Matter, 2022
    The structural and magnetic properties of hole doped double perovskite La1.5Ca0.5CoFeO6 have been investigated by measuring x-ray photoemission spectroscopy, neutron powder diffraction and magnetization. A ferrimagnetic transition is observed at T C∼ 167 K. The presence of anti-site disorder (ASD) in La1.5Ca0.5CoFeO6 has also been demonstrated. Double re-entrant cluster glass transitions (T 1∼ 11 K and TS ∼ 35 K) were observed which has been attributed to the ASD effect. The presence of both large spontaneous exchange bias H SEB ∼ 2.106 kOe and giant conventional exchange bias H CEB ∼ 1.56 T at 5 K has also been observed which can be attributed to the coexistence of long range magnetic ordering and glassy state. The experimental observations were explained with the results obtained by the density functional theory calculation. The presence of double glassy states, large exchange-bias effect and different magnetic phases make this system a potential candidate for spintronic applications.