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Title: Proximity to a critical point driven by electronic entropy in URu2Si2

Journal Article · · npj Quantum Materials

Abstract The strongly correlated actinide metal URu 2 Si 2 exhibits a mean field-like second order phase transition at T o  ≈ 17 K, yet lacks definitive signatures of a broken symmetry. Meanwhile, various experiments have also shown the electronic energy gap to closely resemble that resulting from hybridization between conduction electron and 5 f -electron states. We argue here, using thermodynamic measurements, that the above seemingly incompatible observations can be jointly understood by way of proximity to an entropy-driven critical point, in which the latent heat of a valence-type electronic instability is quenched by thermal excitations across a gap, driving the transition second order. Salient features of such a transition include a robust gap spanning highly degenerate features in the electronic density of states, that is weakly (if at all) suppressed by temperature on approaching T o , and an elliptical phase boundary in magnetic field and temperature that is Pauli paramagnetically limited at its critical magnetic field.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1769419
Alternate ID(s):
OSTI ID: 1807868
Report Number(s):
LA-UR-20-26957; 24; PII: 317
Journal Information:
npj Quantum Materials, Journal Name: npj Quantum Materials Vol. 6 Journal Issue: 1; ISSN 2397-4648
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United Kingdom
Language:
English

References (75)

Imaging the Three-Dimensional Fermi-Surface Pairing near the Hidden-Order Transition in URu 2 Si 2 Using Angle-Resolved Photoemission Spectroscopy journal September 2013
Magnetic-field, pressure, and temperature scaling of the first-order valence transition in pure and doped YbInCu 4 journal July 1997
Upper Limit for the Critical Field in Hard Superconductors journal September 1962
De Haas-van Alphen Oscillation in Both the Normal and Superconducting Mixed States of UPd 2 Al 3 journal February 1999
Hidden-order pseudogap in URu 2 Si 2 journal December 2011
High Magnetic Field Studies of the Hidden Order Transition in U R u 2 S i 2 journal December 2002
Spin Nematic State as a Candidate of the Hidden Order Phase of URu 2 Si 2 journal May 2011
Onset of antiferromagnetism in UPt 3 via Th substitution studied by muon spin spectroscopy journal December 2003
Hastatic order in the heavy-fermion compound URu2Si2 journal January 2013
Valence fluctuation phenomena journal January 1981
Partially gapped Fermi surface in the heavy-electron superconductor URu 2 Si 2 journal January 1986
Magnetoelastic coupling in URu 2 Si 2 : Probing multipolar correlations in the hidden order state journal June 2019
Imaging the Fano lattice to ‘hidden order’ transition in URu2Si2 journal June 2010
Anomalous Properties around Magnetic Instability in Heavy Electron Systems journal March 1995
Probing 5 f -state configurations in URu 2 Si 2 with U L III -edge resonant x-ray emission spectroscopy journal July 2016
Optical spectroscopy shows that the normal state of URu2Si2 is an anomalous Fermi liquid journal October 2012
Reentrant Hidden Order at a Metamagnetic Quantum Critical End Point journal March 2003
Modulated Spin Liquid: A New Paradigm for URu 2 Si 2 journal March 2011
Suppression of the γ–α structural phase transition in Ce 0.8 La 0.1 Th 0.1 by large magnetic fields journal February 2005
Fermi-surface selective determination of the g -factor anisotropy in URu 2 Si 2 journal April 2019
Low temperature specific heat of URu2Si2 near the superconducting transition journal August 1990
High-Magnetic-Field Lattice Length Changes in URu 2 Si 2 journal December 2012
Colloquium : Hidden order, superconductivity, and magnetism: The unsolved case of URu 2 Si 2 journal November 2011
Detailed optical spectroscopy of hybridization gap and hidden-order transition in high-quality URu 2 Si 2 single crystals journal December 2016
Evidence of a hidden-order pseudogap state in URu 2 Si 2 using ultrafast optical spectroscopy journal October 2011
Helicity Order: Hidden Order Parameter in URu 2 Si 2 journal January 2006
Field-Induced Fermi Surface Reconstruction and Adiabatic Continuity between Antiferromagnetism and the Hidden-Order State in URu 2 Si 2 journal April 2007
The Ehrenfest Classification of Phase Transitions: Introduction and Evolution journal May 1998
Magnetic-Field-Induced Quantum Critical Point and Competing Order Parameters in U R u 2 S i 2 journal December 2003
Momentum-resolved hidden-order gap reveals symmetry breaking and origin of entropy loss in URu2Si2 journal July 2014
Elaboration of the α-model derived from the BCS theory of superconductivity journal October 2013
A note on the Maximum Critical Field of High‐Field Superconductors journal September 1962
Emergent rank-5 nematic order in URu2Si2 journal June 2012
Fermi-surface instability at the ‘hidden-order’ transition of URu2Si2 journal July 2009
Hidden orbital order in the heavy fermion metal URu2Si2 journal June 2002
Fluctuation Effects at a Peierls Transition journal August 1973
Electronic structure theory of the hidden-order material URu 2 Si 2 journal November 2010
Phase Transition between Hidden and Antiferromagnetic Order in U R u 2 S i 2 journal April 2003
Specific heat of URu 2 Si 2 in fields up to 42 T: Clues to the hidden order journal January 2003
Hidden Ordering and Heavy Mass in URu 2 Si 2 and Its Alloys journal November 1997
Group theory and octupolar order in U Ru 2 Si 2 journal February 2005
Superconducting Pairs with Extreme Uniaxial Anisotropy in URu 2 Si 2 journal February 2012
Sequential Spin Polarization of the Fermi Surface Pockets in URu 2 Si 2 and Its Implications for the Hidden Order journal April 2011
First-order valence transition in YbInCu 4 in the ( B , T )-plane journal November 2000
Specific heat of heavy-fermion URu 2 Si 2 in high magnetic fields journal December 1997
Why the Hidden Order in URu 2 Si 2 Is Still Hidden–One Simple Answer journal March 2010
On the Hidden Order in URu 2 Si 2 – Antiferro Hexadecapole Order and Its Consequences journal August 2011
Quadrupole and dipole orders in URu 2 Si 2 journal November 1999
Theory of Superconductivity journal December 1957
Thermal expansion and specific heat of monocrystalline U Ru 2 Si 2 journal December 1986
Introduction to Many-Body Physics book December 2015
Hidden order in URu2Si2 originates from Fermi surface gapping induced by dynamic symmetry breaking journal February 2009
Point-contact spectroscopy of superconducting URu 2 Si 2 journal September 1992
Arrested Kondo effect and hidden order in URu2Si2 journal September 2009
One-component order parameter in URu 2 Si 2 uncovered by resonant ultrasound spectroscopy and machine learning journal March 2020
The Kondo Problem to Heavy Fermions book January 1993
Theory of Unconventional Spin Density Wave: A Possible Mechanism of the Micromagnetism in U-based Heavy Fermion Compounds journal October 1998
Visualizing the formation of the Kondo lattice and the hidden order in URu2Si2 journal May 2010
Singlet Magnetism in Heavy Fermions journal May 1995
Similarity of the Fermi Surface in the Hidden Order State and in the Antiferromagnetic State of URu 2 Si 2 journal November 2010
Interpretation of Kondo experiments in a magnetic field journal November 1975
Observation of the Hybridization Gap and Fano Resonance in the Kondo Lattice URu 2 Si 2 journal June 2012
Quantum Critical 5 f Electrons Avoid Singularities in U ( Ru , Rh ) 2 Si 2 journal July 2005
Symmetry and correlations underlying hidden order in URu 2 Si 2 journal January 2015
Degree of 5 f electron localization in URu 2 Si 2 : Electron energy-loss spectroscopy and spin-orbit sum rule analysis journal July 2010
Hybridization gap and anisotropic far-infrared optical conductivity of URu 2 Si 2 journal November 2011
Evidence for Spin Singlet Pairing with Strong Uniaxial Anisotropy in URu 2 Si 2 Using Nuclear Magnetic Resonance journal January 2018
Thermodynamic Measurement of Angular Anisotropy at the Hidden Order Transition of URu 2 Si 2 journal October 2016
Rotational Symmetry Breaking in the Hidden-Order Phase of URu2Si2 journal January 2011
Chirality density wave of the "hidden order" phase in URu2Si2 journal February 2015
Crystal Field Model of the Magnetic Properties of U Ru 2 Si 2 journal August 1994
Translational Symmetry Breaking and Gapping of Heavy-Quasiparticle Pocket in URu2Si2 journal October 2013
Hall-effect and resistivity study of the heavy-fermion system URu 2 Si 2 journal April 1987
Hybridization Wave as the “Hidden Order” in URu 2 Si 2 journal February 2011
Quantum oscillations in URu2Si2 journal February 1997

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