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All Journal Jurnal Fisika FLUX INDONESIAN JOURNAL OF APPLIED PHYSICS BULETIN FISIKA
Oki Ade Putra
Universitas Diponegoro
Astronomy Earth & Planetary Sciences Education Energy Materials Science & Nanotechnology Medicine & Pharmacology Physics

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Journal : buletin fisika

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Simulasi Teoretis terhadap Kaca Borat Terdoping SnO untuk Optimalisasi Efisiensi Perisai Radiasi Sinar Gamma Oki Ade Putra; Dhani Nur Indra Syamputra; Fariz Budi Arafat; Rin Hafsahtul Asiah
BULETIN FISIKA Vol. 26 No. 2 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i02.p04

Abstract

Kaca perisai radiasi berbasis bismut borat telah banyak diteliti karena sifat optik dan ketahanannya yang baik. Dalam penelitian ini, dilakukan evaluasi terhadap pengaruh variasi fraksi mol SnO terhadap kinerja perisai sistem kaca xSnO–(60–x)B2O3–20Bi2O3–10TiO2–10MgO dengan x = 0, 4, 8, dan 12 mol%. Perhitungan dilakukan secara teoritis menggunakan perangkat lunak XCOM dari National Institute of Standards and Technology (NIST) pada rentang energi 0,01–3 MeV. Parameter yang dianalisis meliputi koefisien atenuasi massa (MAC), koefisien atenuasi linier (LAC), half value layer (HVL), tenth-value-layer (TVL), dan mean free path (MFP). Hasil simulasi menunjukkan bahwa penambahan SnO secara signifikan meningkatkan densitas kaca, yang berdampak pada peningkatan nilai MAC dan penurunan nilai HVL, TVL, dan MFP. Selain itu, dibandingkan dengan kaca komersial RS-253-G18 dan boraks sintetis 40%, seluruh sampel berbasis SnO menunjukkan performa perisai yang lebih baik. Oleh karena itu, semua sampel kaca berbasis SnO, khususnya dengan 12 mol% SnO, memiliki potensi besar sebagai material alternatif untuk aplikasi pelindung radiasi energi tinggi.
Electronic Properties of Topological Superconductors XC (X = V, Nb) with Hexagonal Structure: A Density Functional Theory Perspective Erik Bhekti Yutomo; Suci Faniandari; Oki Ade Putra
BULETIN FISIKA Vol. 26 No. 2 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i02.p08

Abstract

Topological superconductors are a class of materials that combine superconductivity with nontrivial topological electronic band structures. In this study, we investigate the electronic properties of two transition metal carbides, VC and NbC, in their hexagonal phases. The calculations are performed using the Density Functional Theory (DFT) approach, with explicit consideration of spin–orbit coupling (SOC) to explore the possible emergence of nontrivial band topology. The calculated band structures reveal metallic behavior in both materials, characterized by the presence of electronic states at the Fermi level. VC exhibits two Dirac points along the Γ–M and K–Γ paths, as well as a Weyl point at the K point. In contrast, NbC shows two Dirac points and one triply degenerate point along the Γ–A path. Upon inclusion of SOC, these topological features not only persist but become more pronounced, particularly near the K point and along the Γ–A direction. The projected density of states (PDOS) analysis indicates that these topological features originate from strong hybridization between the transition metal d orbitals (V 3d and Nb 4d) and the carbon 2p orbitals. These results suggest that hexagonal-phase VC and NbC are promising candidates for topological superconductors, with potential applications in future quantum technologies.
Co-Authors Andrean Johandra Dhani Nur Indra Syamputra Erik Bhekti Yutomo Erik Bhekti Yutomo Fariz Budi Arafat Iqbal Firdaus Junaidi Junaidi Rin Hafsahtul Asiah Rizky Ponco Rahmadi Simon Sembiring Suci Faniandari TB Ikhwan Rifansyah