Giant Anisotropic Magnetoresistance due to Purely Orbital Rearrangement in the Quadrupolar Heavy Fermion Superconductor 
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Shimura, Yasuyuki; Zhang, Qiu; Zeng, Bin; Rhodes, Daniel; Schönemann, R.; Takao, Masaki; Matsumoto, Y.; Sakai, Akito; Sakakibara, Toshiro; Araki, Koji; Zheng, Wenkai; Zhou, Qiong; Balicas, Luis; Nakatsuji, Satoru

doi:10.1103/physrevlett.122.256601

Cited by 11 publications

(8 citation statements)

References 43 publications

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“…The nature of the quadrupolar ordering in these cage compounds has been indirectly examined with a few techniques 40,41 such as ultrasound experiments 42–45 (indicating softening of elastic modulus at quadrupolar ordering temperature, ), as well as NMR measurements (where the magnetic field-induced dipole moment is strongly dependent on the underlying quadrupolar phase 46 ). More recently, magnetostriction and thermal expansion strain experiments 47 have also lent themselves as possible probes to study the transitions and the underlying quadrupolar phase.…”

Section: Introductionmentioning

confidence: 99%

Unveiling hidden multipolar orders with magnetostriction

et al. 2019

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Broken symmetries in solids involving higher order multipolar degrees of freedom are historically referred to as “hidden orders” due to the formidable task of detecting them with conventional probes. In this work, we theoretically propose that magnetostriction provides a powerful and novel tool to directly detect higher-order multipolar symmetry breaking—such as the elusive octupolar order—by examining scaling behaviour of length change with respect to an applied magnetic field h. Employing a symmetry-based Landau theory, we focus on the family of Pr-based cage compounds with strongly correlated f-electrons, Pr(Ti,V,Ir)2(Al,Zn)20, whose low energy degrees of freedom are purely higher-order multipoles: quadrupoles $${\cal{O}}_{20,22}$$ O 20 , 22 and octupole $${\cal{T}}_{xyz}$$ T x y z . We demonstrate that a magnetic field along the [111] direction induces a distinct linear-in-h length change below the octupolar ordering temperature. The resulting “magnetostriction coefficient” is directly proportional to the octupolar order parameter, thus providing clear access to such subtle order parameters.

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Section: Introductionmentioning

confidence: 99%

Unveiling hidden multipolar orders with magnetostriction

et al. 2019

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“…However, PrV 2 Al 20 still possesses many unresolved issues among the Pr-based 1-2-20 compounds. It exhibits the non-Fermi liquid 36 , the multiphase diagram [37][38][39] , and in particular, double transitions (DT) at zero magnetic field 40,41 . None of their origins or mechanisms have been well understood, and even the order parameters (OPs) of the symmetry broken phases have not been identified.…”

Section: Introduction-mentioning

confidence: 99%

“…Under magnetic fields, cubic Γ 3 systems show various phase transitions 18,20,39,40,[44][45][46] . Indeed, for PrV 2 Al 20 , various field-induced phases are reported [37][38][39][40] , and the typical scale of magnetic fields is much larger (> 30 T) than the other members. Thus, one must explain these phase diagrams and the DT in a unified way.…”

Section: Introduction-mentioning

confidence: 99%

“…The condition of small J 1 is relaxed if the third-neighbor couplings are taken account, and as long as the leading single-q instability occurs at q 1,2,3 , the essential results in this study are invariant. Now, we discuss that the low-T OPs for PrV 2 Al 20 at |H| = H = 0 is not a simple coexisting state with ferro OMs and QMs, focusing on the experimental results for H [111] 39,40,42 . Suppose a second-order transition to a QO happens at T =T 1 and subsequently an OO does at T =T 2 <T 1 .…”

Section: Introduction-mentioning

confidence: 99%

“…Denoting the QM (ferro OM) as η (χ 0 ), one can estimate the ground state energy as [111], where a 1,2 ∼T 1,2 . Just below the critical field 11∼12 T 39,40 , we can set 0<η 1 and χ 0…”

Section: Introduction-mentioning

confidence: 99%

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Triple-$q$ quadrupole-octupole order scenario for PrV$_2$Al$_{20}$

Ishitobi,

Hattori

2021

Preprint

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We propose novel triple-q multipole orders in quadrupolar Kondo system PrV2Al20. Anisotropies of quadrupole moments stabilize a triple-q order, which further leads to the second transition to a coexisting phase with triple-q octupole moments. The mechanism for realizing these triple-q states is unique to time-reversal even multipolar systems. There, the cubic invariant of quadrupole moments with triple-q components in its free energy plays an important role. We analyze a multipolar exchange model by mean-field approximation and discuss the temperature and magnetic-field phase diagrams. Many of the microscopic results such as finite ferro octupole moments in the coexisting phase and the field-induced phases are qualitatively consistent with the experiments in PrV2Al20.

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Anisotropic Melting Path of Charge‐Ordering Insulator in LSMO/STO Superlattice

et al. 2022

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Multiple phases coexist in manganite with simultaneously active couplings, and the transition among them depends on the relative intensities of different interactions. However, the melting path with variable intensities is unclear. The concentration and the ordering of oxygen vacancy in previous work are found to induce ferromagnetic charge-ordering insulator phase in [(La 0.7 Sr 0.3 MnO 3 ) 10 /(SrTiO 3 ) 5 ] n superlattice, which translates into metallic phase with magnetic field H and temperature T. In the current work, the H-T phase diagram for current I//[100] and I//[110] shows a large difference with H normal to the film plane, which is ascribed to the response of a variable range of hopping process to H with the in-plane anisotropic hopping probability of charge carrier. With H rotating from the out-of-plane to the in-plane direction, the preferred occupancy of the 3d z 2 −r 2 orbital causes a decrease of spin-orbital coupling and lowers the activation energy, inducing a gentler melting process of a charge-ordering insulator. This work shows that the melting path of a charge-ordering insulator phase can be largely modulated in manganite with anisotropy.

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Giant Anisotropic Magnetoresistance due to Purely Orbital Rearrangement in the Quadrupolar Heavy Fermion Superconductor PrV2Al20

Cited by 11 publications

References 43 publications

Unveiling hidden multipolar orders with magnetostriction

Unveiling hidden multipolar orders with magnetostriction

Triple-$q$ quadrupole-octupole order scenario for PrV$_2$Al$_{20}$

Anisotropic Melting Path of Charge‐Ordering Insulator in LSMO/STO Superlattice

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