New Physics: Sae Mulli

Aims and Scope

The origin of New Physics: Sae Mulli (NPSM, ISO abbreviation: New Phys.: Sae Mulli.): Sae Mulli (새물리 in Korean characters means ‘new physics’) is the oldest Korean pure scientific journal. It was first published in 1961 just after the Korean War by the Korean Physical Society (KPS). The primary mission of Sae Mulli was to start building up Korean physics research community from almost nothing and in fact Sae Mulli had made tremendous contributions to the Korean science community. Through a peer-review system, Sae Mulli had continued elevating the level of scientific researches, consequently becoming a cornerstone of the economic miracle of Korea...

Editor-in-Chief : Sam Jin KIM
New Physics: Sae Mulli Editorial Board

pISSN : 0374-4914
eISSN : 2289-0041

Tel : +82-2-556-4737
Fax : +82-2-554-1643
E-mail: npsm@npsm-kps.org

Research Papers

Analysis of the Superconducting Characteristics of Niobium Thin Films Deposited by Using a DC Magnetron Sputtering System

Joonyoung CHOI¹, Jaehyun LEE¹, Chang-Duk KIM*¹, Younjung JO†¹, Jeonghun KANG², Sung Ho BAE², Jaehyeok YANG², Dabin JEONG²

¹ Department of Physics, Kyungpook National University, Daegu 41566, Korea

² Daegu Science High School, Daegu 42110, Korea

The superconducting characteristics of Nb thin films deposited by using a DC magnetron sputtering system are investigated as a function of the sputtering temperature. The crystallinities of Nb and NbO are analyzed using an X-ray diffractometer (XRD), and the surface characteristics are analyzed using a field-emission scanning electron microscope (FE-SEM) and an atomic force microscope (AFM). The superconducting characteristics of the fabricated Nb thin films are confirmed using measurements of the resistance as a function of the temperature. The Nb thin film grown at a sputtering temperature of 240 $^\circ$C exhibits the highest crystallinity of Nb and the lowest crystallinity of NbO. The superconducting transition temperature ($T_c$) of the optimized film is 8.34 K, which is close to $T_c$ of bulk Nb, 9.25 K. Therefore, we confirm that NbO crystallinity caused by oxygen is the critical factor that inhibits the superconducting characteristics of the Nb thin films.

New Phys.: Sae Mulli 2018; 68: 284-289

High Throughput Procedure to Determine the Energy Levels of Carbon Crystals

Jai Seok AHN*

Department of Physics, Pusan National University, Busan 46241, Korea

To predict a new material with exotic physical properties, we introduce a new theoretical procedure for synthesizing an arbitrary crystal structure by filling the Wyckoff positions of a spacegroup. All the potential crystal structures of a given spacegroup are synthesized with the following three steps: First of all, independent sets of Wyckoff positions are generated. Secondly, the degrees of freedom in the generated sets are pre-optimized using the classical molecular dynamics method. Finally, the crystal structures are further refined using an ab-initio quantum mechanical calculation. We synthesized and compared the crystal structures and the energy levels of carbon crystals composed of less than 16 carbon atoms by using the procedure to generate and refine more than six thousands crystal structures. The utility of our method in predicting an extensive variety of carbon structures, including most of known ones, is demonstrated.

New Phys.: Sae Mulli 2018; 68: 279-283

New Phys.: Sae Mulli 2018; 68: 269~374

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Research Papers

Analysis of the Transmission Characteristics for a Neutron Guide

Jeong-Soo LEE*

New Phys.: Sae Mulli 2018; 68: 269-278 https://doi.org/10.3938/NPSM.68.269