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Ok, Jong Mok
원자제어 저차원 전자계 연구단
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Observation of in-plane magnetic field induced phase transitions in FeSe

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Title
Observation of in-plane magnetic field induced phase transitions in FeSe
Author(s)
Jong Mok Ok; Chang Il Kwon; Yoshimitsu Kohama; Jung Sang You; Sun Kyu Park; Ji-hye Kim; Y. J. Jo; Choi, ES; Koichi Kindo; Woun Kang; Ki-Seok Kim; Moon, EG; Gurevich, A; Jun Sung Kim
Subject
ELECTRON-SPIN, ; SUPERCONDUCTIVITY, ; TEMPERATURE, ; NEMATICITY, ; STATES, ; ORDER
Publication Date
2020-06
Journal
PHYSICAL REVIEW B, v.101, no.22, pp.224509
Publisher
AMER PHYSICAL SOC
Abstract
© 2020 American Physical Society. 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
URI
https://pr.ibs.re.kr/handle/8788114/7810
DOI
10.1103/PhysRevB.101.224509
ISSN
2469-9950
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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