Pressure-induced quantum melting of chiral spin order and subsequent transition to a degenerate semiconductor state in FeGe

Y. Fujishiro; C. Terakura; A. Miyake; N. Kanazawa; K. Nakazawa; N. Ogawa; H. Kadobayashi; S. Kawaguchi; T. Kagayama; M. Tokunaga; Y. Kato; Y. Motome; K. Shimizu; Y. Tokura

doi:10.1103/PhysRevB.110.L220401

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Pressure-induced quantum melting of chiral spin order and subsequent transition to a degenerate semiconductor state in FeGe

Y. Fujishiro ^1,2,*, C. Terakura ¹, A. Miyake^3,4, N. Kanazawa⁵, K. Nakazawa¹, N. Ogawa¹, H. Kadobayashi⁶, S. Kawaguchi⁶, T. Kagayama⁷ et al.

M. Tokunaga^1,4, Y. Kato ⁸, Y. Motome ⁹, K. Shimizu⁷, and Y. Tokura^1,9,10,†

¹RIKEN Center for Emergent Matter Science (CEMS), Saitama 351-0198, Japan
²RIKEN Cluster for Pioneering Research (CPR), Saitama 351-0198, Japan
³Institute for Materials Research (IMR), Tohoku University, Ibaraki 311-1313, Japan
⁴The Institute for Solid State Physics (ISSP), The University of Tokyo, Chiba 277-8581, Japan
⁵Institute of Industrial Science, University of Tokyo, Tokyo 153-8505, Japan
⁶Japan Synchrotron Radiation Research Institute (JASRI), Spring-8, Hyogo 679-5198, Japan
⁷Center for Quantum Science and Technology under Extreme Conditions, Osaka University, Osaka 560-8531, Japan
⁸Department of Applied Physics, The University of Fukui, Fukui 910-8507, Japan
⁹Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
¹⁰Tokyo College, The University of Tokyo, Tokyo 113-8656, Japan

^*Contact author: yukako.fujishiro@riken.jp
^†Contact author: tokura@riken.jp

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Phys. Rev. B 110, L220401 – Published 5 December, 2024

DOI: https://doi.org/10.1103/PhysRevB.110.L220401

Abstract

We report on high-pressure magnetotransport study of itinerant chiral magnet FeGe with near-room-temperature ( $T_{c} = 278$ K) helical/skyrmion spin texture. The pressure-induced reduction of exchange splitting leads to the Fermi surface reconstruction upon quantum phase transition (QPT) at $P \sim 19$ GPa as well as the suqsequent transition into the degenerate semiconductor state. Furthermore, we discover unconventional spontaneous anomalous Hall effect in the short-range-order chiral-spin ground state above QPT, signifying macroscopic time-reversal symmetry breaking. Our results highlight the high- $T_{c}$ itinerant magnets with broken inversion symmetry as promising candidates for ground state formation near QPT.

Physical Review B

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Pressure-induced quantum melting of chiral spin order and subsequent transition to a degenerate semiconductor state in FeGe

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Pressure-induced quantum melting of chiral spin order and subsequent transition to a degenerate semiconductor state in FeGe

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