Field-induced spin-density wave beyond hidden order in URu2Si2

Knafo, William; Duc, F.; Bourdarot, F.; Kuwahara, K.; Nojiri, Hiroyuki; Aoki, Dai; Billette, J.; Frings, P.; Tonon, Xavier; Lelièvre‐Berna, E.; Flouquet, J.; Regnault, L.P.

doi:10.1038/ncomms13075

Cited by 39 publications

(48 citation statements)

References 55 publications

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“…On one hand, the magnetic field strengths are limited by the construction material of the magnet, and on the other, the orientation of the sample with respect to the magnetic field and neutron beam imposes specific geometrical restrictions. Challenging neutron experiments in pulsed magnetic fields [10] were recently performed revealing the main features of field-induced magnetic structures in pure URu 2 Si 2 and 4% Rh-doped systems that are found to be different [11,12]. While in the former system it is a spin-density wave (SDW) characterized by Q 1 = (0.600), suspected to be of multi-Q nature [11], in the latter case the propagation vector is Q 2 = ( 2 3 00).…”

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confidence: 99%

Magnetic structure in a U(Ru0.92Rh0.08)2Si2 single crystal studied by neutron diff

et al. 2017

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We report a high-field-induced magnetic phase in a single crystal of U(Ru 0.92 Rh 0.08 ) 2 Si 2 . Our neutron study, combined with high-field magnetization, shows that the magnetic phase above the first metamagnetic transition at μ 0 H c1 = 21.6 T has an uncompensated commensurate antiferromagnetic structure with a propagation vector Q 2 = ( 2 3 00) possessing two single-Q domains. U moments of 1.45(9)μ B directed along the c axis are arranged in an up-up-down sequence propagating along the a axis, in agreement with bulk measurements. The U magnetic form factor at high fields is consistent with both the U 3+ and U 4+ types. The low-field short-range order that emerges from pure URu 2 Si 2 due to Rh doping is initially strengthened by the field but disappears in the field-induced phase. The tetragonal symmetry is preserved across the transition, but the a-axis lattice parameter increases already at low fields. Our results are in agreement with an itinerant electron model with 5f states forming bands pinned in the vicinity of the Fermi surface that is significantly reconstructed by the applied magnetic field. DOI: 10.1103/PhysRevB.96.121117 Despite more than three decades of intense study the ground state of the well-established hidden order (HO at T HO = 17.5 K)/superconducting (SC at T SC = 1.5 K) heavy-fermion system URu 2 Si 2 remains unknown and under heavy dispute [1]. The HO is linked to an antiferromagnetic (AF) order [2][3][4] and fluctuations characterized by a propagation vector Q 0 = (100) that can be stabilized either by strain or doping [5]. At temperatures where the HO exists, new phases can be created by perturbations. A strong magnetic field is necessary to suppress the HO order and drive the system into distinct metamagnetic transitions (MTs) between 35 and 39 T before reaching a polarized Fermi-liquid state [6,7].High critical fields can be reduced by a suitable light doping, in particular, by a Rh substitution for Ru [6,8]. Such substitutions quickly destroy both the HO and SC states in the range of a few percent, keeping the heavy-fermion behavior intact, and stabilize (2%-3% Rh) AF order with Q 0 [9]. For doping levels above 10% Rh, a long-range AF order withAlthough high-field bulk measurements disclose important insights regarding the physical states emerging from HO, only microscopic methods such as neutron diffraction yield information regarding the periodicity and nature of the order. However, it is most challenging to combine this technique with static magnetic fields exceeding ∼17 T. This is due to two main limitations. On one hand, the magnetic field strengths are limited by the construction material of the magnet, and on the other, the orientation of the sample with respect to the magnetic field and neutron beam imposes specific geometrical restrictions. Challenging neutron experiments in pulsed magnetic fields [10] were recently performed revealing the main features of field-induced magnetic structures in pure URu 2 Si 2 and 4% Rh-doped systems that are found to be different [11,...

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confidence: 99%

Magnetic structure in a U(Ru0.92Rh0.08)2Si2 single crystal studied by neutron diff

et al. 2017

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“…For instance, they have different impact on (1) the spin orbit coupling, (2) the lattice contraction and strain, (3) the local crystal electric field, and (4) in principle could alter different parts of the Fermi surface. Furthermore, given the complexity that is seen in other chemical substitution series, under applied pressure and in high magnetic fields [9][10][11][12][13][14][15][16][17][18][19][20], a priori it seems unlikely that Si → P and Ru → Rh substitution would be equivalent. Despite this, we find phase diagrams with similar features both along the electronic shell filling and applied magnetic field tuning axes.…”

Section: Discussionmentioning

confidence: 99%

“…The response of the parent compound to an applied magnetic field is also well known [16][17][18][19][20]. For T < T 0 , the magnetoresistance initially increases with µ 0 H and eventually drops to a minimum near 35 T, indicating the end of the hidden order phase (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…At approximately 36T a third phase (Phase III) appears as a step like increase in magnetoresistance, which extends up to ≈ 39T, before giving way to a spin polarized paramagnetic state (Phase IV). Neutron scattering experiments in pulsed magnetic fields recently showed that phase II is an incommensurate spin density wave state with wave-vector k=(0.6,0,0) [20].…”

Section: Methodsmentioning

confidence: 99%

“…Chemical substitution also tends to promote magnetism, where Ru → Fe and Os yields phase diagrams similar to that seen with pressure a The concentration in this paper is defined as URu 2−x RhxSi 2 while the chemical formula in the literature is given as U(Ru 1−x Rhx) 2 Si 2 [24][25][26] [10-12], Ru → Tc and Re stabilize ferromagnetism, and Ru → Rh and Ir eventually produce antiferromagnetism [13][14][15]. Particularly interesting is that large magnetic fields suppress hidden order and uncover a rich family of magnetically ordered field induced (FI) states, where elastic neutron scattering in pulsed magnetic fields recently revealed that the lowest-in-magnetic field of them is a type of spin density wave order [16][17][18][19][20]. These tuning strategies reveal rich phenomena and indicate a close relationship between hidden order and magnetism, but what is missing is both a picture that unifies the diverse behavior and simple tuning schemes to access the multitude of ordered states in clean single crystals at ambient pressure.…”

Section: Introductionmentioning

confidence: 99%

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Role of band filling in tuning the high-field phases of URu2Si2

Wartenbe¹,

Chen²,

Gallagher³

et al. 2017

Phys. Rev. B

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We present a detailed study of the low temperature and high magnetic field phases in the chemical substitution series URu2Si2−xPx using electrical transport and magnetization in pulsed magnetic fields up to 65T. Within the hidden order x-regime (0 < x 0.035) the field induced ordering that was earlier seen for x = 0 is robust, even as the hidden order temperature is suppressed. Earlier work shows that for 0.035 x 0.26 there is a Kondo lattice with a no-ordered state that is replaced by antiferromagnetism for 0.26 x 0.5. We observe a simplified continuation of the field induced order in the no-order x-regime and an enhancement of the field induced order upon the destruction of the antiferromagnetism with magnetic field. These results closely resemble what is seen for URu2−xRhxSi2 a , from which we infer that charge tuning dominantly controls the ground state of URu2Si2, regardless of whether s/p or d-electrons are replaced. Contraction of the unit cell volume may also play a role at large x. This provides guidance for determining the specific factors that lead to hidden order versus magnetism in this family of materials and constrains possible models for hidden order.

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Field-induced spin-density wave beyond hidden order in URu2Si2

Cited by 39 publications

References 55 publications

Magnetic structure in a U(Ru0.92Rh0.08)2Si2 single crystal studied by neutron diff

Magnetic structure in a U(Ru0.92Rh0.08)2Si2 single crystal studied by neutron diff

Role of band filling in tuning the high-field phases of URu2Si2

Biomass-derived nitrogen-doped hierarchical porous carbon as efficient sulfur host for lithium–sulfur batteries

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