Jong mok Ok

Jong Mok Ok

Email: dynamicjm(at)postech.ac.kr

Office : Room # 1115 in Research Institute of Science and Technology (RIST)

Tel: +82-(0)54-279-5402

- 2017.3~current : Postdoctoral fellow, IBS CALDES, POSTECH

2017.2: Ph.D in Physics department, POSTECH (Adviser: Prof. J. S. Kim)
2011.2: B.S., in Physics, POSTECH, Pohang, Korea

RESEARCH INTEREST

Exotic Superconductivity and Magnetism in Transition Metal Pnictides and Frustrated Metallic Magnets
Synthesis and Single Crystal Growth of Novel Superconductors
Electrical Transport Properties and Torque Magnetometry under Extreme Conditions

PUBLICATIONS

Published papers

- - - 1. "Switching Magnetism and Superconductivity with Spin-Polarized Current in Iron-Based Superconductor"
      2. Seokhwan Choi, Hyoung Joon Choi, Jong Mok Ok, Yeonghoon Lee, Won-Jun Jang, Alex Taekyung Lee, Young Kuk, SungBin Lee, Andreas J. Heinrich, Sang-Wook Cheong, Yunkyu Bang, Steven Johnston, Jun Sung Kim, Jhinhwan Lee
      3. Phys. Rev. Lett. 119, 227001 (2017).

- 1. "Enhancement of superconductivity by interfacial phonons in perovskite-clad FeAs monolayers"

- 1. "Frustration-driven C₄ symmetric orders in a hetero-structured iron-based superconductor"
    1. Jong Mok Ok, S.-H. Baek, C. Hoch, R. K. Kremer, S. Y. Park, Sungdae Ji, B. Buchner, J.-H. Park, S. I. Hyun, J. H. Shim, Yunkyu Bang, E. G. Moon, I. I. Mazin, and Jun Sung Kim
    2. Nat. Commun. 8, 2167 (2017).

- - 1. "Nematicity and magnetism in LaFeAsO single crystals probed by 75As nuclear magnetic resonance"
    2. J. M. Ok, S.-H. Baek, D. V. Efremov, R. Kappenberger, S. Aswartham, J. S. Kim, J. van den Brink, and B. Büchner
    3. Phys. Rev. B 97, 180405(R) (2018).
    4. "Effect of chemical doping on heterostructured Fe-based superconductor Sr2VO3FeAs"
    5. Jong Mok Ok, Se Woong Na, and Jun Sung Kim
    6. accepted in PSAC

- - - - Seokhwan Choi, Won-Jun Jang, Hyun-Jung Lee, Jong Mok Ok, Hyun Woo Choi, Alex Taekyung Lee, Alireza Akbari, Ken Nakatsukasa, Yannis K. Semertzidis, Yunkyu Bang, Steven Johnston, Jun Sung Kim, Jhinhwan Lee
        Phys. Rev. Lett, 119, 107003 (2017).

1. "Broken-Symmetry Quantum Hall States in Twisted Bilayer Graphene"

- - - - Youngwook Kim, Jaesung Park, Intek Song, Jong Mok Ok, Y. J. Jo, Kenji Watanabe, Takashi Taniguchi, Hee Cheul Choi, Dong Su Lee, Suyong Jung, Jun Sung Kim

- - 1. Sci. Rep. 6, 38068 (2016).

1. "Nematicity and in-plane anisotropy of superconductivity in FeSe detected by ⁷⁷Se nuclear magnetic resonance"
  1. S.-H. Baek, D. V. Efremov, J. M. Ok, J. S. Kim, Jeroen van den Brink, B. Büchner
  2. Phys. Rev. B, 93, 180502(R) (2016)..
2. "20 K superconductivity in heavily electron doped surface layer of FeSe bulk crystal"

- - 1. Yeong kwan Kim, Jeongjin Seo, Beomyoung Kim, Beom Seo Kim, Jongkeun Jung, Jongmok OK, Jun Sung Kim, Changyoung Kim, Jonathan Denlinger, and Sung-Kwan Mo
    2. Nat. Commun. 7, 11116 (2016).

1. "Anomalous magnetothermopower in a metallic frustrated antiferromagnet"
  1. Stevan Arsenijevi.c, Jong Mok Ok, Peter Robinson, Saman Ghannadzadeh, Mikhail I. Katsnelson, Jun Sung Kim, and Nigel E. Hussey
  2. Phys. Rev. Lett., 116, 087202 (2016).
2. "Simple Fabrication Method for Atomically-thin Crystal Devices with Polymer Passivation"
  1. 1. Yong Hyeon Kim, Youngwook Kim, So Young Kim, Jong Mok Ok, Changil Kwon, Sang Wook Lee, Jun Sung Kim,
    2. Synth. Metals, 216, 98 (2016).
3. "Role of bonding angle and orbital mixing in iron pnictide superconductivity: comparative electronic structure studies of LiFeAs and Sr₂VO₃FeAs"

- 1. Y. K. Kim, Y. Y. Koh, W. S. Kyung, G. R. Han, B. Lee, Kee Hoon Kim, J. M. Ok, J. S. Kim, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, S.-K. Mo, and C. Kim,
  2. Phys. Rev. B. 92, (R)041116 (2015).
  3. "Superconductivity in FeSe: orbital-driven nematicity sets the stage"
    1. S.-H. Baek, D. V. Efremov, J. M. Ok, J. S. Kim, Jeroen van den Brink, and B. Buechner
    2. Nat. Mater. 14, 210 (2015).

1. "Anisotropic superconductivity of high quality FeSe1-x single crystal"

- 1. Chang Il Kwon, Jong Mok Ok, and Jun Sung Kim
  2. PSAC. 16, 26-30 (2014).
  3. "Successive spin-flop transitions of Neel-type antiferromagnet Li₂MnO₃ single crystal with honeycomb-lattice"
    1. K. Balamurugan, Sang-Hyun Lee, Jun-Sung Kim, Jong-Mok Ok, Youn-Jung Jo, Young-Mi Song, Shin-Ae Kim, E. S. Choi, Manh Duc Le, and Je-Geun Park
    2. Phys. Rev. B. 90, 104412 (2014).

1. "Enhancement of in-plane magnetic anisotropy in (111)-oriented Co0.8Fe2.2O4 thin film by deposition of PZT top layer "

- 1. M. Khodaei, S. A. Seyyed Ebrahimi, Yong Jung Park, Jong Mok Ok, Jung Sung Kim, Junwoo Son, Sunggi Baik
  2. Appl. Phys. A, s00339-014-8486-0 (2014).

1. "Direct Observation of Localized Spin Antiferromagnetic Transition in PdCrO2 by Angle-Resolved Photoemission Spectroscopy"

- 1. Han-Jin Noh, Jinwon Jeong, Bin Chang, Dahee Jeong, Hyun Sook Moon, En-Jin Cho, Jong Mok Ok, Jun Sung Kim, Kyoo Kim, B. I. Min, Han-Koo Lee, Jae-Young Kim, Byeong-Gyu Park, Hyeong-Do Kim, and Seongsu Lee
  2. Sci. Rep. 4, 3680 (2014).

1. “Quantum oscillations in triangular antiferromagnetic metal PdCrO2"

- 1. Jong Mok Ok, Y. J. Jo, K. Kim, T. Shishidou, E. S. Choi, Han-Jin Noh, T. Oguchi, B. I. Min, and Jun Sung Kim
  2. Phys. Rev. Lett. 111, 176405 (2013).

1. "Strong in-plane magnetic anisotropy in(111)-oriented CoFe2O4 thin film”

- 1. M. Khodaei, S.A.Seyyed Ebrahimi, Yong Jun Park, Jong Mok Ok, Jun Sung Kim, JunwooSon, SunggiBaik
    1. J. Mag. Mag. Mater. 340, 16 (2013).

Submitted

- 1. Large anomalous Hall current induced by topological nodal lines in a ferromagnetic van der Waals material"
  2. Kyoo Kim, Junho Seo, Eunwoo Lee, Jong Mok Ok, Jinwon Lee, Youn Jung Jo, Woun Kang, Ji Hoon Shim, Han Woong Yeom, Byung Il Min, Bohm-Jung Yang, and Jun Sung Kim
  3. submitted.

1. "Dichotomous pseudo-gap in iron pnictide superconductor Sr2VO3FeAs"
  1. Sunghun Kim, Jong Mok Ok, Yi Zhang, Jun Sung Kim, Jonathan Denlinger, Sung-Kwan Mo, C. Kim
  2. submitted.
2. "Spin-Chiral Bulk Fermi Surfaces of BiTeI Proven by Quantum Oscillations"

- 1. Joonbum Park, E. Kampert, Kyung-Hwan Jin, Man Jin Eom, Jongmok Ok, E. S. Choi, F. Wolff-Fabris, K. D. Lee, N. Hur, J.-S Rhyee, Y. J. Jo, Seung-Hoon Jhi, Jun Sung Kim
  2. submitted, arXiv:1306.1747

PRESENTATIONS

1. "Large field-induced anomalous Hall effect of a itinerant frustrated antiferromagnet PdCrO2"
  1. APS March meeting (Contribution oral talk), LA, USA, Mar. 2018
2. "A natural hetero-structured Fe-based superconductor: upper critical field study"

- 1. KSS (Contribution oral talk), Gyeongu Korea, Jan. 2018 *Outstanding oral presentation

1. "Frustration-driven C₄ symmetric orders in a hetero-structured iron-based superconductor"

- 1. KPS (Invited talk), Gyeongu Korea, Oct. 2017

1. "Unusual C4-symmetric orders in a Hetero-structured Iron-based Superconductor"

- 1. KPS (Contribution oral talk), Daejeon Korea, Apr. 2017

1. "Multiple Fulde-Ferrel-Larkin-Ovchinnikov states in FeSe"

- 1. QMS (Poster), Yongpyong Korea,Feb. 2017

1. "Emergent electronic phases in a hetero-structured iron-based superconductor"

- 1. QMS (Poster), Yongpyong Korea,Feb. 2017

1. "Emergent electronic phases in a hetero-structured iron-based superconductor"

- 1. KSS (Contribution oral talk), Gyeongju, Korea, Jan. 2017

1. "Hidden order in a natural heterostructure of iron pnictides and vanadium oxides"

- 1. APS March meeting (Contribution oral talk), Baltimore, U.S.A, March 2016

1. "Hidden order in a natural heterostructure of iron pnictides and vanadium oxides"

- 1. Quantum Material Symposium (Poster), Incheon, Korea, Feb. 2016

1. "Unsusal phase transition in a natural heterostructure of iron pnictides and vanadium oxides"

- 1. JKT16 (Poster), Tokyo, Japan, Feb. 2016

1. "Exotic magnetic phases of metallic triangular lattice antiferromagnet PdCrO2"

- 1. EMR (Poster), Pohang, Korea, July. 2015

1. "Coexistence of high-Tc superconductivity and weak ferromagnetism in natural heterostructure of iron pnictides and vanadium oxides"

- 1. TJK15 symposium (Poster), Shinchu, Taiwan, Mar. 2015

1. "Possible Flude-Ferrell-Larkin-Ovchinnikov superconducting state in high quality FeSe single crystal"

- 1. KSS (Contribution oral talk), Muju, Korea, Feb. 2015 *Outstanding oral presentation

1. "Coexistence of high-Tc superconductivity and weak ferromagnetism in natural heterostructure of iron pnictides and vanadium oxides"

- 1. Multiferroic Workshop in Pohang (Poster), Pohang, Korea, Nov. 2014

1. "Sr2VO3FeAs as a natural heterostructure of magnetic SrVO3 and superconducting FeAs layers"

- 1. KPS (Contribution oral talk), Gwangju, Korea, Oct. 2014

1. "Magnetic phase diagram of the metallic triangular-lattice antiferromagnet PdCrO2"

- 1. SRC workshop summer (Poster) ,Korea, 2014

1. "Sr2VO3FeAs : Hybrid of a magnetic SrVO3 and a FeAs superconducting layers"

- 1. KSS (Contribution oral talk), Yongpyong, Korea, July 2014 *Outstanding oral presentation

1. "Quantum oscillations of the metallic triangular-lattice antiferromagnet PdCrO2"

- 1. APS March meeting (Contribution oral talk), Denver, U.S.A, March 2014

"Electronic nematicity in LaFeAsO proven by torque magnetometry"
1. KPS (Contribution oral talk), Changwon, Korea, November 2013 *Outstanding oral presentation
"Electronic nematicity in SmFeAsO proven by torque magnetometry"

1. KSS (Poster), Yongpyong, Korea, July 2013 *Outstanding poster

"Field-induced unconventional anomalous Hall effect in metallic triangular antiferromagnet PdCrO2"

1. SRC workshop summer (Poster) ,Korea, 2013

Quantum oscillation of a metallic triangular-lattice antiferromagnet PdCrO2"

1. Quantum Material Symposium (Poster), Muju, Korea, January, 2013

"Sr2VO3FeAs : Hybrid of a magnetic SrVO3 and a FeAs superconducting layers"

1. Dasan conference on superconducitivity (Poster), Jeju, Korea, November 2012

"Sr2VO3FeAs : Hybrid of a magnetic SrVO3 and a FeAs superconducting layers"

1. KSS (Poster), Gyeongju, Korea, July 2012

"Quantum oscillation of a metallic triangular-lattice antiferromagnet PdCrO2"

1. SRC workshop summer Korea (Poster), Korea, 2012

"Quantum oscillation of a metallic triangular-lattice antiferromagnet PdCrO2"

1. BK21 Young physicist workshop (Poster), Korea, 2012 *Bronze Award
2. "A de Haas-van Alphen study on the Fermi surfaces of a metallic triangular-lattice magnet, PdCrO2"
  1. KPS Spring meeting (Poster), Daejeon, Korea, Apr. 2012

FELLOWSHIPS & AWARDS

1. 2008.03 - 2011.02 : Presidential Science Scholarship of Korea
2. 2011.03 - 2016.03 : Global Ph.D. Fellowship
3. Best graduate student's research of year award at the POSTECH (2013)
4. Research of year award at the CALDES (Institute for Basic Science) (2013)
5. Research of year award at the CALDES (Institute for Basic Science) (2017)