Observation of in-plane magnetic field induced phase transitions in FeSe
- 주제(기타) Materials Science, Multidisciplinary
- 주제(기타) Physics, Applied
- 주제(기타) Physics, Condensed Matter
- 설명문(일반) [Ok, Jong Mok; Kwon, Chang Il; You, Jung Sang; Park, Sun Kyu; Kim, Ki-Seok; Kim, Jun Sung] Pohang Univ Sci & Technol, Dept Phys, Pohang 37673, South Korea; [Ok, Jong Mok; Kwon, Chang Il; You, Jung Sang; Park, Sun Kyu; Kim, Jun Sung] Inst for Basic Sci Korea, Ctr Artificial Low Dimens Elect Syst, Pohang 37673, South Korea; [Kohama, Yoshimitsu; Kindo, Koichi] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan; [Kim, Ji-hye; Jo, Y. J.] Kyungpook Natl Univ, Dept Phys, Daegu 702701, South Korea; [Choi, E. S.] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA; [Kang, Woun] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea; [Moon, E. G.] Korea Acad Inst Sci & Technol, Dept Phys, Daejeon 34141, South Korea; [Gurevich, A.] Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA
- 등재 SCIE, SCOPUS
- OA유형 Green Published, Green Submitted
- 발행기관 AMER PHYSICAL SOC
- 발행년도 2020
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000168711
- 본문언어 영어
- Published As https://dx.doi.org/10.1103/PhysRevB.101.224509
초록/요약
We investigate thermodynamic properties of FeSe under in-plane magnetic fields using torque magnetometry, specific heat, and magnetocaloric measurements. Below the upper critical field H-c2, we observed the field induced anomalies at H-1 similar to 15 T and H-2 similar to 22 T near H parallel to ab and below a characteristic temperature T* similar to 2 K. The transition magnetic fields H-1 and H-2 exhibit negligible dependence on both temperature and field orientation. This contrasts to the strong temperature and angle dependence of H-c2, suggesting that these anomalies are attributed to the field induced phase transitions, originating from the inherent spin-density-wave instability of quasipaticles near the superconducting gap minima or possible Flude-Ferrell-Larkin-Ovchinnikov state in the highly spin-polarized Fermi surfaces. Our observations imply that FeSe, an atypical multiband superconductor with extremely small Fermi energies, represents a unique model system for stabilizing unusual superconducting orders beyond the Pauli limit.
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