Field-tuned ferroquadrupolar quantum phase transition in the insulator TmVO\(_{4}\)
We report results of low-temperature heat capacity, magnetocaloric effect and neutron diffraction measurements of TmVO\(_{4}\), an insulator that undergoes a continuous ferroquadrupolar phase transition associated with local partially-filled \(4f\) orbitals of the thulium (Tm\(^{3+}\)) ions. The fer...
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Abstract | We report results of low-temperature heat capacity, magnetocaloric effect and neutron diffraction measurements of TmVO\(_{4}\), an insulator that undergoes a continuous ferroquadrupolar phase transition associated with local partially-filled \(4f\) orbitals of the thulium (Tm\(^{3+}\)) ions. The ferroquadrupolar transition, a realization of Ising nematicity, can be tuned to a quantum critical point using a magnetic field oriented along the \(c\)-axis of the tetragonal crystal lattice, which acts as an effective transverse field for the Ising-nematic order. In small magnetic fields, the thermal phase transition can be well-described using a semi-classical mean field treatment of the transverse field Ising model. However, in higher magnetic fields, closer to the field-tuned quantum phase transition, subtle deviations from this semi-classical behavior are observed due to quantum fluctuations. Although the phase transition is driven by the local \(4f\) degrees of freedom, the crystal lattice still plays a crucial role, both in terms of mediating the interactions between the local quadrupoles, and in determining the critical scaling exponents, even though the phase transition itself can be described via mean field. In particular, bilinear coupling of the nematic order parameter to acoustic phonons changes the spatial and temporal fluctuations of the former in a fundamental way, resulting in different critical behavior of the nematic transverse-field Ising model as compared to the usual case of the magnetic transverse-field Ising model. Our results establish TmVO\(_{4}\) as a model material, and electronic nematicity as a paradigmatic example, for quantum criticality in insulators. |
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AbstractList | We report results of low-temperature heat capacity, magnetocaloric effect and neutron diffraction measurements of TmVO\(_{4}\), an insulator that undergoes a continuous ferroquadrupolar phase transition associated with local partially-filled \(4f\) orbitals of the thulium (Tm\(^{3+}\)) ions. The ferroquadrupolar transition, a realization of Ising nematicity, can be tuned to a quantum critical point using a magnetic field oriented along the \(c\)-axis of the tetragonal crystal lattice, which acts as an effective transverse field for the Ising-nematic order. In small magnetic fields, the thermal phase transition can be well-described using a semi-classical mean field treatment of the transverse field Ising model. However, in higher magnetic fields, closer to the field-tuned quantum phase transition, subtle deviations from this semi-classical behavior are observed due to quantum fluctuations. Although the phase transition is driven by the local \(4f\) degrees of freedom, the crystal lattice still plays a crucial role, both in terms of mediating the interactions between the local quadrupoles, and in determining the critical scaling exponents, even though the phase transition itself can be described via mean field. In particular, bilinear coupling of the nematic order parameter to acoustic phonons changes the spatial and temporal fluctuations of the former in a fundamental way, resulting in different critical behavior of the nematic transverse-field Ising model as compared to the usual case of the magnetic transverse-field Ising model. Our results establish TmVO\(_{4}\) as a model material, and electronic nematicity as a paradigmatic example, for quantum criticality in insulators. We report results of low-temperature heat capacity, magnetocaloric effect and neutron diffraction measurements of TmVO$_{4}$, an insulator that undergoes a continuous ferroquadrupolar phase transition associated with local partially-filled $4f$ orbitals of the thulium (Tm$^{3+}$) ions. The ferroquadrupolar transition, a realization of Ising nematicity, can be tuned to a quantum critical point using a magnetic field oriented along the $c$-axis of the tetragonal crystal lattice, which acts as an effective transverse field for the Ising-nematic order. In small magnetic fields, the thermal phase transition can be well-described using a semi-classical mean field treatment of the transverse field Ising model. However, in higher magnetic fields, closer to the field-tuned quantum phase transition, subtle deviations from this semi-classical behavior are observed due to quantum fluctuations. Although the phase transition is driven by the local $4f$ degrees of freedom, the crystal lattice still plays a crucial role, both in terms of mediating the interactions between the local quadrupoles, and in determining the critical scaling exponents, even though the phase transition itself can be described via mean field. In particular, bilinear coupling of the nematic order parameter to acoustic phonons changes the spatial and temporal fluctuations of the former in a fundamental way, resulting in different critical behavior of the nematic transverse-field Ising model as compared to the usual case of the magnetic transverse-field Ising model. Our results establish TmVO$_{4}$ as a model material, and electronic nematicity as a paradigmatic example, for quantum criticality in insulators. |
Author | Massat, Pierre Wen, Jiajia Fisher, Ian R Jiang, Jack M Liu, Yaohua Smaha, Rebecca W Lee, Young S Fernandes, Rafael M Hristov, Alexander T Feigelson, Robert S |
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BackLink | https://doi.org/10.48550/arXiv.2110.03791$$DView paper in arXiv https://doi.org/10.1073/pnas.2119942119$$DView published paper (Access to full text may be restricted) |
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Snippet | We report results of low-temperature heat capacity, magnetocaloric effect and neutron diffraction measurements of TmVO\(_{4}\), an insulator that undergoes a... We report results of low-temperature heat capacity, magnetocaloric effect and neutron diffraction measurements of TmVO$_{4}$, an insulator that undergoes a... |
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SubjectTerms | Critical point Crystal lattices Crystal structure Insulators Ising model Low temperature Magnetic fields Neutron diffraction Neutrons Order parameters Phase transitions Physics - Strongly Correlated Electrons Quadrupoles Thulium |
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Title | Field-tuned ferroquadrupolar quantum phase transition in the insulator TmVO\(_{4}\) |
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