The quantum oscillations (QO) are periodic in inverse magnetic field and are also field-angle dependent reflecting both intrinsic and bulk thermodynamic property of the material. Consequently, the heat capacity contains the information about the QO. For a normal metal, the Lifshitz–Kosevich (LK) theory predicts the magnitude of the quantum oscillations in the heat capacity for ordinary metals to be on the order of 0.1% of the ordinary electronic specific heat [1, 2].

We have measured the low temperature heat capacity C(T, B) as well as magnetization M(T = 2.00 K, B) of V₂Ga₅ single crystals as a function of applied magnetic field. Our measurements of C(T, B) were carried out using custom-built rotatable micro-calorimeter. The QO signal is the most prominent, when field is oriented along the vanadium chain (c-axis), which is confirmed by the isothermal magnetization studies in [3].

Applying the FFT frequency analysis for a field sweep between 3 and 8 T at selected temperatures, we resolved a sharp frequency peak of 126.6 T, which is in an excellent agreement with our quantum de Haas-van Alphen oscillations data and those obtained by [3]. Using the two independent approaches, the effective mass m* = 0.245 has been determined with the Dingle temperature T_D = 1.25 K, enabling to further estimate the quantum relaxation time, mobility and mean free path. The Berry phase Φ_B was determined by the direct fit of C_osc(T, B) and using the construction of the Landau’s fan diagram.

[1] P. G. LaBarre, A. Rydh, J. Palmer-Fortune, J. A. Frothingham, S. T. Hannahs, A. P. Ramirez and N. A. Fortune, Magnetoquantum oscillations in the specific heat of a topological Kondo insulator, J. Phys.: Condens. Matter 34, 36LT01(2022).

[2] D. Shoenberg, Magnetic Oscillations in Metals, Cambridge: Cambridge University Press, 1984.

[3] Y. L. Huang et al., Transport and quantum oscillations in the quasi-one-dimensional superconductor V₂Ga₅, Physical Review B 111, 024503 (2025).