Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.176401
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Funding
- National Natural Science Foundation of China [51072213, 11328401, 11234012]
- State Oceanic Administration [SHME2013JS01]
- Science and Technology Commission of Shanghai Municipality [13JC1402900, 11JC1404700, 14XD1424300]
- U.S. Department of Energy [DE-SC0002623]
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We report a unique temperature-induced insulator-metal transition in MnB4 that is accompanied by a simultaneous magnetostructural change from a nonmagnetic monoclinic mP20 phase to a magnetic orthorhombic oP10 phase. Such a concurring magnetostructural and insulator-metal transformation is a manifestation of a strong competition between Peierls and Stoner mechanisms that governs a crossover from an electron-pairing to an electron-localization scenario in this system. Therefore, the phase stability of MnB4 is controlled by a subtle interplay among the Peierls mechanism, Stoner mechanism, and phonon free energy. Our findings not only resolve the longstanding magnetostructural puzzle of MnB4 but also provide a realistic system for the Peierls-Hubbard model.
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