Superconductivity and Structural Phase Transitions in Caged Compounds RT<sub>2</sub>Zn<sub>20</sub> (R = La, Pr, T = Ru, Ir)

Onimaru, Takahiro; Matsumoto, Keisuke; Inoue, Yuya; Umeo, Kazunori; Saiga, Yasuhiro; Matsushita, Yoshitaka; Tamura, Ryuji; Nishimoto, Kazue; Ishii, Isao; Suzuki, Takashi; Takabatake, Toshiro

doi:10.1143/jpsj.79.033704

Cited by 179 publications

(163 citation statements)

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“…In the following sections, we will present our numerical results in the classical Monte Carlo (MC) simulations for the models (4) and (7). The typical system size defined by the number of sites is N = L 3 (8 ≤ L ≤ 128), and the periodic boundary condition is used for all the three directions.…”

Section: Model Hamiltonianmentioning

confidence: 99%

“…Inside this phase the sublattice moments uniformly fluctuate. 26,28) We will examine the following two points in our rotor model (7). The first one is about the nature of the lowtemperature ordered phase.…”

Section: Low-temperature Ordered Phasementioning

confidence: 99%

“…Anisotropy in the orbital sector in these systems is manifested in the strong anisotropy of the critical field and the phase diagram strongly dependent on the field direction. 9,10,17,18) Superconductivity appears in a couple of compounds near the quadrupole ordered phases, 7,19) and it is expected that orbital fluctuations in the non-Kramers doublet in the Pr ions contribute to its realization.…”

Section: Introductionmentioning

confidence: 99%

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Classical Monte Carlo Study for Antiferro Quadrupole Orders in a Diamond Lattice

Hattori

Tsunetsugu

2016

J. Phys. Soc. Jpn.

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We investigate antiferro quadrupole orders in a diamond lattice under magnetic fields by Monte Carlo simulations for two types of classical effective models. One is an XY model with Z3 anisotropy, and the other is a two-component φ 4 model with a third-order anisotropy. We confirm that the universality class of the zero-field transition is that for the three-dimensional XY model. Magnetic field corresponds to a Z3 field in the effective model, and under this field, we find that collinear and canted antiferro-quadrupole orders compete. Each phase is characterized by symmetry breaking in the sector of (sublattice Z2)⊗(reflection Z2 for the order parameter). When Z3 anisotropy and magnetic field vary, it turns out that this system is a good playground for various multicritical points; bicritical and tetracritical points emerge in a finite field. Another important finding is about the scaling of parasitic ferro quadrupole order at the zero-field critical point. This is the secondary order parameter induced by the primary antiferro order, and its critical exponent β ′ =0.815 clearly differs from the expected value that is twice the value for the primary order parameter. The corresponding correlation length exponent is also different, ν ′ =0.597(12). We also discuss relation of the present effective quadrupole models with the 3-state Potts model as well as implication to undertanding of orbital orders in Pr-based 1-2-20 compounds.

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Section: Model Hamiltonianmentioning

confidence: 99%

Section: Low-temperature Ordered Phasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Classical Monte Carlo Study for Antiferro Quadrupole Orders in a Diamond Lattice

Hattori

Tsunetsugu

2016

J. Phys. Soc. Jpn.

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“…The Pr atom is surrounded by the Zn atoms at the 16c and 96g sites whose atomic displacement parameters are much larger than those at the other atomic sites [5]. It was proposed that the low-energy phonons of the Zn atoms induce the structural transition of the isostructural RRu 2 Zn 20 (R = La and Pr) and LaIr 2 Zn 20 [11,13,14]. The Zn atom at the 96g site is also a part of a Zn cage surrounding the Rh or Co atom.…”

Section: Magnetic Transport and Thermal Measurementsmentioning

confidence: 99%

“…Therefore, it is suggested that the quadrupole fluctuations play a role in formation of the superconducting Cooper pairs. No structural transition was found in PrIr 2 Zn 20 up to 600 K. For PrRh 2 Zn 20 , on the other hand, a first-order structural transition has been suggested by a hysteretic behavior in the electrical resistivity between 140 and 470 K [9,10,11]. In PrRh 2 Zn 20 , C(T) exhibits a Schottky anomaly peaking at 14 K, and magnetization curves measured at 1.8 K show anisotropic behaviors.…”

Section: Introductionmentioning

confidence: 96%

Suppression of Superconductivity in PrRh₂Zn₂₀by the Substitution of Co for Rh

Shimada

Nagasawa

Onimaru

et al. 2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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Electrical resistivity ρ, magnetic susceptibility χ and specific heat C of Pr(Rh 1-x Co x ) 2 Zn 20 for 0 ≤ x ≤ 0.89 were measured to study the mechanism of simultaneous superconducting and antiferroquadrupolar (AFQ) transitions at T c = T Q = 0.06 K in PrRh 2 Zn 20 . A broad peak in the magnetic specific heat C m (T) at around 13 K is reproduced as a Schottky peak by a doublet-triplet two-levels model. However, another broad peak in C m (T) at 1 -3 K indicates splitting of the doublet state by a slight distortion of Zn cages due to the Co substitution. As a consequence of the splitting, the quadrupolar degrees of freedom must be quenched. With increasing x, T c = 0.06 K for x = 0 is suppressed below 0.04 K for x ≥ 0.10. The suppression of T c suggests possible interplay between the superconductivity and the quadrupolar degrees of freedom.

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Hard X-ray Photoelectron Spectroscopy

Suga

Sekiyama

Tusche

2021

Springer Series in Surface Sciences

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Superconductivity and Structural Phase Transitions in Caged Compounds RT₂Zn₂₀ (R = La, Pr, T = Ru, Ir)

Cited by 179 publications

References 10 publications

Classical Monte Carlo Study for Antiferro Quadrupole Orders in a Diamond Lattice

Classical Monte Carlo Study for Antiferro Quadrupole Orders in a Diamond Lattice

Suppression of Superconductivity in PrRh₂Zn₂₀by the Substitution of Co for Rh

Hard X-ray Photoelectron Spectroscopy

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Superconductivity and Structural Phase Transitions in Caged Compounds RT2Zn20 (R = La, Pr, T = Ru, Ir)

Cited by 179 publications

References 10 publications

Classical Monte Carlo Study for Antiferro Quadrupole Orders in a Diamond Lattice

Classical Monte Carlo Study for Antiferro Quadrupole Orders in a Diamond Lattice

Suppression of Superconductivity in PrRh2Zn20by the Substitution of Co for Rh

Hard X-ray Photoelectron Spectroscopy

Contact Info

Product

Resources

About

Superconductivity and Structural Phase Transitions in Caged Compounds RT₂Zn₂₀ (R = La, Pr, T = Ru, Ir)

Suppression of Superconductivity in PrRh₂Zn₂₀by the Substitution of Co for Rh