Caging-Pnictogen-Induced Superconductivity in Skutterudites IrX<sub>3</sub> (X = As, P)

Pei, Cuiying; Ying, Tianping; Zhang, Qinghua; Wu, Xin‐Xing; Yu, Tongxu; Zhao, Yi; Gao, Lingling; Li, Changhua; Cao, Weizheng; Zhang, Qing; Schnyder, Andreas P.; Gu, Lin; Chen, Xiaolong; Hosono, Hideo; Qi, Yanpeng

doi:10.1021/jacs.1c09244

Cited by 21 publications

(7 citation statements)

References 33 publications

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“…Four Pt foils were arranged in a van der Pauw four‐probe configuration to contact the sample in the chamber for resistivity measurements. [ 20 ] Pressure was determined by the ruby luminescence method. [ 21 ] The in‐situ high‐pressure Raman spectroscopy measurements were performed using a Raman spectrometer (Renishaw inVia, U.K.) with a laser excitation wavelength of 532 nm and low‐wavenumber filter.…”

Section: Methodsmentioning

confidence: 99%

Disorder‐Broadened Phase Boundary with Enhanced Amorphous Superconductivity in Pressurized In₂Te₅

Zhao,

Ying,

Zhao

et al. 2024

Advanced Materials

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As an empirical tool in materials science and engineering, the iconic phase diagram owes its robustness and practicality to the topological characteristics rooted in the celebrated Gibbs phase law (F = C – P + 2). When crossing the phase diagram boundary, the structure transition occurs abruptly, bringing about an instantaneous change in physical properties and limited controllability on the boundaries (F = 1). Here, we expand the sharp phase boundary to an amorphous transition region (F = 2) by partially disrupting the long‐range translational symmetry, leading to a sequential crystalline‐amorphous‐crystalline (CAC) transition in a pressurized In2Te5 single crystal. Through detailed in‐situ synchrotron diffraction, we elucidate that the phase transition stems from the rotation of immobile blocks [In2Te2]2+, linked by hinge‐like [Te3]2− trimers. Remarkably, within the amorphous region, the amorphous phase demonstrates a notable 25% increase of the superconducting transition temperature (Tc), while the carrier concentration remains relatively constant. Furthermore, we propose a theoretical framework revealing that the unconventional boost in amorphous superconductivity might be attributed to an intensified electron correlation, triggered by a disorder‐augmented multifractal behavior. These findings underscore the potential of disorder and prompt further exploration of unforeseen phenomena on the phase boundaries.This article is protected by copyright. All rights reserved

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Section: Methodsmentioning

confidence: 99%

Disorder‐Broadened Phase Boundary with Enhanced Amorphous Superconductivity in Pressurized In₂Te₅

Zhao,

Ying,

Zhao

et al. 2024

Advanced Materials

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“…High pressure can create atypical materials by repopulating atomic orbitals and reconstructing functional units without altering the chemical composition [25–28] . Herein, we explore the possibility of obtaining high‐ T c superconductor by constructing square‐lattice configurations under pressure, employing layered metallic Li 0.6 Sn 2 As 2 and semiconducting NaSnAs as examples.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity in an Orbital‐Reoriented SnAs Square Lattice: A Case Study of Li_0.6Sn₂As₂ and NaSnAs

et al. 2023

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Searching for functional square lattices in layered superconductor systems offers an explicit clue to modify the electron behavior and find exotic properties. The trigonal SnAs3 structural units in SnAs‐based systems are relatively conformable to distortion, which provides the possibility to achieve structurally topological transformation and higher superconducting transition temperatures. In the present work, the functional As square lattice was realized and activated in Li0.6Sn2As2 and NaSnAs through a topotactic structural transformation of trigonal SnAs3 to square SnAs4 under pressure, resulting in a record‐high Tc among all synthesized SnAs‐based compounds. Meanwhile, the conductive channel transfers from the out‐of‐plane pz orbital to the in‐plane px+py orbitals, facilitating electron hopping within the square 2D lattice and boosting the superconductivity. The reorientation of p‐orbital following a directed local structure transformation provides an effective strategy to modify layered superconducting systems.

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“…Pressure is an effective method to tune the lattice structure and to manipulate the electronic state, such as superconductivity and topological phases of matter, without introducing impurities [ 11 , 12 , 13 , 14 , 15 ]. Despite the superconductivity in ternary equiatomic transition metal phosphides TT’X being reported a few decades ago [ 10 ], a detailed study of its superconducting properties, in particular under high-pressure association with topological states, is still lacking.…”

Section: Introductionmentioning

confidence: 99%

“…However, when considering the SOC, they enter either a Weyl semimetal (WSM) phase (e.g., HfRuP) due to the lack of inversion symmetry or a topological crystalline insulating (TCI) phase (e.g., ZrRuAs) with trivial Fu-Kane Z2 indices but nontrivial mirror Chern numbers. Combined with noncentrosymmetric superconductivity, the nontrivial topology of the normal state in ZrRuAs/HfRuP may generate unconventional superconductivity in both the bulk and surfaces.Pressure is an effective method to tune the lattice structure and to manipulate the electronic state, such as superconductivity and topological phases of matter, without introducing impurities 11,12,13,14,15 . Despite the superconductivity in ternary equiatomic transition metal phosphides TT'X being reported a few decades ago 10 , a detailed study of its superconducting properties, in particular under high-pressure association with topological states, is still lacking.…”

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Pressure-Tuning Superconductivity in Noncentrosymmetric Topological Materials ZrRuAs

Zhang

et al. 2022

Materials

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Recently, the hexagonal phase of ternary transition metal pnictides TT’X (T = Zr, Hf; T’ = Ru; X = P, As), which are well-known noncentrosymmetric superconductors, were predicted to host nontrivial bulk topology. In this work, we systematically investigate the electronic responses of ZrRuAs to external pressure. At ambient pressure, ZrRuAs show superconductivity with Tc ~ 7.74 K, while a large upper critical field ~ 13.03 T is obtained for ZrRuAs, which is comparable to the weak-coupling Pauli limit. The resistivity of ZrRuAs exhibits a non-monotonic evolution with increasing pressure. The superconducting transition temperature Tc increases with applied pressure and reaches a maximum value of 7.93 K at 2.1 GPa, followed by a decrease. The nontrivial topology is robust and persists up to the high-pressure regime. Considering both robust superconductivity and intriguing topology in this material, our results could contribute to studies of the interplay between topological electronic states and superconductivity.

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Caging-Pnictogen-Induced Superconductivity in Skutterudites IrX₃ (X = As, P)

Cited by 21 publications

References 33 publications

Disorder‐Broadened Phase Boundary with Enhanced Amorphous Superconductivity in Pressurized In₂Te₅

Disorder‐Broadened Phase Boundary with Enhanced Amorphous Superconductivity in Pressurized In₂Te₅

Superconductivity in an Orbital‐Reoriented SnAs Square Lattice: A Case Study of Li_0.6Sn₂As₂ and NaSnAs

Pressure-Tuning Superconductivity in Noncentrosymmetric Topological Materials ZrRuAs

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Caging-Pnictogen-Induced Superconductivity in Skutterudites IrX3 (X = As, P)

Cited by 21 publications

References 33 publications

Disorder‐Broadened Phase Boundary with Enhanced Amorphous Superconductivity in Pressurized In2Te5

Disorder‐Broadened Phase Boundary with Enhanced Amorphous Superconductivity in Pressurized In2Te5

Superconductivity in an Orbital‐Reoriented SnAs Square Lattice: A Case Study of Li0.6Sn2As2 and NaSnAs

Pressure-Tuning Superconductivity in Noncentrosymmetric Topological Materials ZrRuAs

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Caging-Pnictogen-Induced Superconductivity in Skutterudites IrX₃ (X = As, P)

Disorder‐Broadened Phase Boundary with Enhanced Amorphous Superconductivity in Pressurized In₂Te₅

Disorder‐Broadened Phase Boundary with Enhanced Amorphous Superconductivity in Pressurized In₂Te₅

Superconductivity in an Orbital‐Reoriented SnAs Square Lattice: A Case Study of Li_0.6Sn₂As₂ and NaSnAs