Unveiling the Physics of the Mutual Interactions in Paramagnets

Abstract

In real paramagnets, there is always a subtle many-body contribution to the system's energy, which can be regarded as a small effective local magnetic field $B_{loc}$. Usually, it is neglected, since it is very small when compared with thermal fluctuations and/or external magnetic fields $B$. Nevertheless, as both the temperature $T\to$ 0K and $B\to$ 0T, such many-body contributions become ubiquitous. Here, employing the magnetic Grüneisen parameter ${\Gamma }_{mag}$ and entropy arguments, we report on the pivotal role played by the mutual interactions in the regime of ultra-low-$T$ and vanishing $B$. Our key results are: $i$) absence of a genuine zero-field quantum phase transition due to the presence of $B_{loc}$; $ii$) connection between the canonical definition of temperature and ${\Gamma }_{mag}$; and $iii$) possibility of performing adiabatic magnetization by only manipulating the mutual interactions. Our findings unveil unprecedented aspects emerging from the mutual interactions.

arXiv comment21 pages, 8 figures

References in corpus (27)

• Spin Ice State in Frustrated Magnetic Pyrochlore Materials
• Quantum Criticality in Heavy Fermion Metals
• Realization of Bose-Einstein condensates in lower dimensions
• Bose-Einstein Condensation in Magnetic Insulators
• Quantum magnetism and criticality
• Magnetic-Field Induced Quantum Critical Point in YbRh${}_2$Si${}_2$
• Universally diverging Grueneisen parameter and the magnetocaloric effect close to quantum critical points
• Negative Absolute Temperature for Motional Degrees of Freedom
• Quantum critical state in a magnetic quasicrystal
• Quantum Criticality without Tuning in the Mixed Valence Compound beta-YbAlB4
• Sign change of the Grueneisen parameter and magnetocaloric effect near quantum critical points
• Thermodynamic signatures of quantum criticality in cuprates
• Zero Point Entropy in Stuffed Spin Ice
• Strange metal without magnetic criticality
• Equilibration rates and negative absolute temperatures for ultracold atoms in optical lattices
• β-YbAlB4: a critical nodal metal
• Anomalous critical fields in quantum critical superconductors
• Scaling theory of the Mott transition and breakdown of the Grüneisen scaling near a finite-temperature critical end point
• Pressure-Driven Quantum Criticality and T/H Scaling in the Icosahedral Au-Al-Yb Approximant
• Grüneisen Parameter for Gases
• Entropy accumulation near quantum critical points: effects beyond hyperscaling
• Magnetic field driven quantum criticality in antiferromagnetic CePtIn4
• The Magnetic Grüneisen Parameter for Model Systems
• Enhanced Grüneisen Parameter in Supercooled Water
• Classification of materials with divergent magnetic Grüneisen parameter
• Theory Perspective: SCES 2016
• T/B scaling without quasiparticle mass divergence: YbCo2Ge4

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