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Tricritical-point phase diagram in PrCu9Sn4
Fanying Meng1,2,3, Min Ge2, Wensen Wei1,3
1Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.
Abstract:
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 forH//c. A paramagnetic-to-ferromagnetic magnetic transition occurs withH//catTC= 11.7 K, which is evidenced to be of a first-ordered type. The systematical study of the critical behavior gives thatβ= 0.195(8),γ= 0.911(1), andδ= 0.0592(1) forH//cconsistent with a tricritical mean-field model, which suggests a field-modulated tricritical phenomenon. A detailedH-Tphase diagram around the tricritical point (TCP) is constructed for single-crystal PrCu9Sn4forH//c, where ferromagnetic state, forced ferromagnetic phase and paramagnetic state meet at the TCP (Htr= 799 kOe,Ttr= 11.3 K). The single-crystal PrCu9Sn4supplies a platform to deep investigate the field-modulated magnetic couplings and tricritical phenomenon.
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