Tricritical phenomenon appearing in multiple phases is a fundamental and attractive issue in condensed-matter physics. In this work, a field-modulated tricritical phenomenon is realized in single-crystal PrCu9Sn4. The magnetization under variable directions of field indicates strong magnetic anisotropy in PrCu9Sn4, which reveals ferromagnetic coupling for H==c. A paramagneticto-ferromagnetic magnetic transition occurs with H==c at TC =11.7 K, which is evidenced to be of a first-ordered type. The systematical study of the critical behavior gives that β = 0:195(8), γ = 0:911(1), and δ = 0:0592(1) for H==c consistent with a tricritical mean-field model, which suggests a field-modulated tricritical phenomenon. A detailed H − T phase diagram around the tricritical point is constructed for single-crystal PrCu9Sn4 for H==c, where ferromagnetic state, forced ferromagnetic phase and paramagnetic state meet at the tricritical point (Htr = 799 kOe, Ttr = 11.3 K). The single-crystal PrCu9Sn4 supplies a platform to deep investigate the field-modulated magnetic couplings and tricritical phenomenon.
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