Hidden Orbital Order in U Ru2 Si_2

  title={Hidden Orbital Order in U Ru2 Si\_2},
  author={Premala Chandra and Piers Coleman and J A Mydosh and Vikram Tripathi},
When matter is cooled from high temperatures, collective instabilities develop amongst its constituent particles that lead to new kinds of order. 1 An anomaly in the specific heat is a classic signature of this phenomenon. Usually the associated order is easily identified, but sometimes its nature remains elusive. The heavy fermion metal URu 2 Si 2 is one such example, where the order responsible for the sharp specific heat anomaly at T 0 = 17K has remained unidentified despite more than… 
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Proximity to a critical point driven by electronic entropy in URu2Si2
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
Isoelectronic perturbations to f-d-electron hybridization and the enhancement of hidden order in URu2Si2
This work tracks the temperature increase of the resistive signature of the hidden-order (HO) phase transition in URu2Si2, a mysterious phase with unknown order parameter and presents a scenario in which the application of pressure or the isoelectronic substitution of Fe and Os ions for Ru results in an increase in the hybridization of the U-5f-electron and transition metal d-Electron states which leads to electronic instability in the paramagnetic phase.
Gaussian fluctuation corrections to a mean-field theory of complex hidden order in URu2Si2
Hidden-order phase transition in the heavy-fermion superconductor URu$_2$Si$_2$ exhibits the mean-field-like anomaly in temperature dependence of heat capacity. Motivated by this observation, here we
Pressure Effects on the 4f Electronic Structure of Light Lanthanides.
It is shown that in the case of Ce, mixing of a higher atomic angular momentum state, driven by the increased hybridization, acts to obscure the expected satellite reduction, which is more consistently associated with evolution of the satellite than the reduction of the 4f moment.
Critical Theory of Non-Fermi Liquid Fixed Point in Multipolar Kondo Problem
When the ground state of a localized ion is a non-Kramers doublet, such localized ions may carry multipolar moments. For example, Pr$^{3+}$ ions in a cubic environment would possess quadrupolar and
Landau theory of multipolar orders in Pr(Y)2X20 Kondo materials ( Y=Ti , V, Rh, Ir; X=Al , Zn)
A series of Pr(TM)$_2$X$_{20}$ (with TM=Ti,V,Rh,Ir and X=Al,Zn) Kondo materials, containing non-Kramers Pr$^{3+}$ $4f^2$ moments on a diamond lattice, have been shown to exhibit intertwined orders
Hidden magnetic order in the triangular-lattice magnet Li2MnTeO6
The manganese tellurate Li2MnTeO6 consists of trigonal spin lattices made up of Mn4+ (d3, S = 3/2) ions. The magnetic properties of this compound were characterized by several experimental
Quadrupolar ordering and exotic magnetocaloric effect in RB4 (R = Dy, Ho)
Based on Landau theory, a new mechanism for a large entropy change with low magnetic fields in rare-earth tetraborides, especially for Ho1-xDyxB4 (x = 0.0, 0.5, and 1.0), is proposed.


Low-temperature thermodynamics of the two-dimensional orbital antiferromagnet
We consider the low-temperature properties of a two-dimensional orbital anti-ferromagnet (OAF), which is one of the possible states of the weakly interacting electron system with a half-filled band
Specific heat anomaly in the d-density wave state and emergence of incommensurate orbital antiferromagnetic order
We study the effect of finite chemical potential on the d density wave state that has been proposed to explain the pseudogap phenomena in underdoped cuprates. We find that the specific-heat anomaly
Specific heat of heavy-fermion URu 2 Si 2 in high magnetic fields
We have performed specific-heat measurements on the heavy-fermion superconductor URu2Si2 in magnetic fields up to 17.5 T. A sharp peak in the specific heat signals the antiferromagnetic transition at
Nonlinear susceptibility as a probe of tensor spin order in URu2Si2.
Nonlinear susceptibili- ty measurements on URu2Si2 that probe tensor spin order are presented; they suggest that an itinerant quadrupolar order pa- rameter drives this mysterious transition at 17.
Magnetic excitations in the heavy-fermion superconductor URu2Si2.
  • Broholm, Lin, Kjems
  • Physics
    Physical review. B, Condensed matter
  • 1991
P peaks have not been identified in the magnetic excitation spectra, but instead a continuous spectrum of scattering peaked around the ordering wave vector indicates the presence of overdamped antiferromagnetically correlated spin fluctuations.
Muon spin relaxation in heavy fermion systems
Heavy fermion systems have received a great deal of study by a wide variety of techniques, includingμSR. In a number of systems, coexisting superconducting and magnetic states have been reported,
Hidden Order in $URu_2Si_2$
We review current attempts to characterize the underlying nature of the hidden order in $URu_2Si_2$. A wide variety of experiments point to the existence of two order parameters: a large primary
Anisotropic electrical resistivity of the magnetic heavy-fermion superconductor URu2Si2.
Electrical-resistivity measurements rho(T,H) on single-crystal URu/sub 2/Si/ sub 2/ have been performed between 0.3 and 300 K in fields up to 7 T and an upper antiferromagnetic transition is clearly discerned by a ''Cr-like'' anomaly at roughly-equal17 K which also marks the onset of a strong, positive rho (H).