Browsing by Author "Joydev Khatua"
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PublicationArticle Spin dynamics and 1/3 magnetization plateau in the coupled distorted diamond chain compound K2Cu3(MoO4)4(American Physical Society, 2025) G. Senthil Murugan; Joydev Khatua; Suyoung Kim; Eundeok Mun; K. Ramesh Babu; Heung-sik Kim; C. L. Huang; Raju Kalaivanan; U. Rajesh Kumar; I. Panneer Muthuselvam; Wei Tin Chen; Sritharan Krishnamoorthi; Kwang-yong Choi; Raman SankarWe investigate magnetic properties of the s=1/2 compound K2Cu3(MoO4)4 by combining magnetic susceptibility, magnetization, specific heat, and electron spin resonance (ESR) with density functional calculations. Its monoclinic structure features alternating Cu2+ (s=1/2) monomers and edge-shared dimers linked by MoO4 units, forming a distorted diamond chain along the a axis. Antiferromagnetic order occurs at TN=2.3 K, as evident from a λ-type anomaly in specific heat and magnetic susceptibility derivatives. Inverse magnetic susceptibility reveals coexisting ferro- and antiferromagnetic interactions. Specific heat and ESR data show two characteristic temperatures: one at 20 K, associated with spin-singlet formation in Cu2O9 dimers, and another at 3.68 K, indicating short-range correlations between dimers and monomers. Magnetization measurements reveal a metamagnetic transition at 2.6 T and a critical magnetic field μ0Hc=3.4 T, where a 1/3 magnetization plateau emerges with saturation near 0.35 μB. Low-temperature specific heat and magnetization data reveal the suppression of long-range order at μ0Hc, enabling the construction of a temperature-magnetic field phase diagram showing multiple magnetic phases near the μ0Hc. Density functional theory confirms a distorted diamond chain with J1 dimers and competing J2, J4, J3, and J5 interactions with monomer spins as an effective low-temperature spin model. © 2025 American Physical Society.PublicationArticle Structural, magnetic, and electronic properties of a GdAsSe single crystal: Experimental and theoretical studies(American Physical Society, 2024) R. Kalaivanan; Balaji Venkatesan; B. Dundi Sri Chandana; Rajesh Kumar Ulaganathan; G. Senthil Murugan; K. Moovendaran; Joydev Khatua; Li-Hsin Su; W. Zhou; Xiaofeng Xu; Chia-Seng Chang; Tien-Ming Chuang; Yoshiyuki Iizuka; I. Panneer Muthuselvam; Horng-Tay Jeng; Kwang-Yong Choi; Raman SankarWe report high-quality single-crystal growth, x-ray diffraction, magnetic susceptibility [χ(T,H)], magnetization [M(H)], heat capacity [CP(T,H)], electrical resistivity [ρ(T,H)], and electron spin resonance (ESR) measurements of GdAsSe as functions of temperature and magnetic field. We identify an antiferromagnetic phase transition at TN∼11.9±0.2 K and construct magnetic phase diagrams for H