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• W3099296078 endingPage "084707" @default.
• W3099296078 startingPage "084707" @default.
• W3099296078 abstract "We propose a phenomenological spin fluctuation theory for antiferromagnetic quantum tricritical point (QTCP), where a first-order phase transition changes into a continuous transition at zero temperature. Under magnetic fields, ferromagnetic quantum critical fluctuations develop around the antiferromagnetic QTCP in addition to antiferromagnetic fluctuations, which is in sharp contrast with the conventional antiferromagnetic quantum critical point. For itinerant electron systems, we show that the temperature dependence of critical magnetic fluctuations around the QTCP is given as χ Q ∝ T -3/2 (χ 0 ∝ T -3/4 ) at the antiferromagnetic ordering (ferromagnetic) wave number q = Q ( q =0). The convex temperature dependence of χ 0 -1 is a characteristic feature of the QTCP, which has never been seen in the conventional spin fluctuation theory. We propose a general theory of quantum tricriticality that has nothing to do with the specific Kondo physics itself, and solves puzzles of quantum criticalities widely observed in heavy-fermion systems such as YbRh 2 Si 2 , CeRu 2 Si 2 , and β-YbAlB 4 . For YbRh 2 Si 2 , our theory successfully reproduces quantitative behaviors of the experimentally obtained ferromagnetic susceptibility and magnetization curve when suitable phenomenological parameters are chosen. The quantum tricriticality is also consistent with singularities of other physical properties such as specific heat, nuclear magnetic relaxation time 1/ T 1 T , and the Hall coefficient. For CeRu 2 Si 2 and β-YbAlB 4 , we point out that the quantum tricriticality is a possible origin of the anomalous diverging enhancement of the uniform susceptibility observed in these materials." @default.
• W3099296078 created "2020-11-23" @default.
• W3099296078 creator A5000196142 @default.
• W3099296078 creator A5024011903 @default.
• W3099296078 creator A5043382042 @default.
• W3099296078 date "2009-08-15" @default.
• W3099296078 modified "2023-10-04" @default.
• W3099296078 title "Spin Fluctuation Theory for Quantum Tricritical Point Arising in Proximity to First-Order Phase Transitions: Applications to Heavy-Fermion Systems, YbRh₂Si₂, CeRu₂Si₂, and β-YbAlB₄" @default.
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• W3099296078 doi "https://doi.org/10.1143/jpsj.78.084707" @default.
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