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Observation of in-plane magnetic field induced phase transitions in FeSe
- Title
- Observation of in-plane magnetic field induced phase transitions in FeSe
- Authors
- Ok, Jong Mok; Kwon, Chang Il; Kohama, Yoshimitsu; You, Jung Sang; Park, Sun Kyu; Kim, Ji-hye; Jo, Y. J.; Choi, E. S.; Kindo, Koichi; Kang, Woun; Kim, Ki-Seok; Moon, E. G.; Gurevich, A.; Kim, Jun Sung
- Ewha Authors
- 강원
- SCOPUS Author ID
- 강원
- Issue Date
- 2020
- Journal Title
- PHYSICAL REVIEW B
- ISSN
- 2469-9950
2469-9969
- Citation
- PHYSICAL REVIEW B vol. 101, no. 22
- Publisher
- AMER PHYSICAL SOC
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- 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.
- DOI
- 10.1103/PhysRevB.101.224509
- Appears in Collections:
- 자연과학대학 > 물리학전공 > Journal papers
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