Details

Autor(en) / Beteiligte

• Ding, L.J.
• Zhong, Y.

Titel

Quantum critical scaling for field-induced quantum phase transition in a periodic Anderson-like model polymer chain

Ist Teil von

• Journal of magnetism and magnetic materials, 2017-07, Vol.434, p.105-111

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •The quantum critical scaling is investigated by Green’s function theory.•The obtained power-law critical exponents (β, δ and α) obey the critical scaling relation α+β(1+δ)=2.•The scaling hypothesis equations are proposed to verify the scaling analysis. The quantum phase transition and thermodynamics of a periodic Anderson-like polymer chain in a magnetic field are investigated by Green’s function theory. The T-h phase diagram is explored, wherein a crossover temperature T∗ denoting the gapless phase crossover into quantum critical regimes, smoothly connects near the critical fields to the universal linear line T∗∼(h−hc,s), and ends at hc,s, providing a new route to capture quantum critical point (QCP). The quantum critical scaling around QCPs is demonstrated by analyzing magnetization, specific heat and Grüneisen parameter Γh, which provide direct access to distill the power-law critical exponents (β, δ and α) obeying the critical scaling relation α+β(1+δ)=2, analogous to the quantum spin system. Furthermore, scaling hypothesis equations are proposed to check the scaling analysis, for which all the data collapse onto a single curve or two independent branches for the plot against an appropriate scaling variable, indicating the self-consistency and reliability of the obtained critical exponents.