Qimiao Si

Rice University

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S. Paschen

TU Wien

Rong Yu

Renmin University of China

Jian‐Xin Zhu

Los Alamos National Laboratory

Stefan Kirchner

National Yang Ming Chiao Tung University

Pengcheng Dai

Rice University

Emilian M. Nica

Arizona State University

Haoyu Hu

Donostia International Physics Center

Kevin Ingersent

University of Florida

Hsin-Hua Lai

Rice University

F. Steglich

Max Planck Institute for Chemical Physics of Solids

Cooperative Institutions

Chinese Academy of Sciences

150

Rice University

112

Institute of Physics

University of Chinese Academy of Sciences

Max Planck Institute for Chemical Physics of Solids

Zhejiang University

Lawrence Berkeley National Laboratory

Max Planck Society

Los Alamos National Laboratory

National Laboratory for Superconductivity

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Antiferroquadrupolar Order and Rotational Symmetry Breaking in a Generalized Bilinear-Biquadratic Model on a Square Lattice

Physical Review Letters (2017)

Hsin-Hua Lai Wen-Jun Hu Emilian M. Nica Rong Yu Qimiao Si

The magnetic and nematic properties of the iron chalcogenides have recently been the subject of intense interest. Motivated by the proposed antiferroquadrupolar and Ising-nematic orders for the bulk FeSe, we study the phase diagram of an S=1 generalized bilinear-biquadratic model with multineighbor interactions. We find a large parameter regime for a (π, 0) antiferroquadrupolar phase, showing how quantum fluctuations stabilize it by lifting an infinite degeneracy of certain semiclassical states. Evidence for this C_{4}-symmetry-breaking quadrupolar phase is also provided by an unbiased density matrix renormalization group analysis. We discuss the implications of our results for FeSe and related iron-based superconductors.

Square lattice

Semiclassical physics

10.1103/physrevlett.118.176401

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Citations (16)

Is there more than one type of quantum critical points in heavy-fermion metals?

Journal of Magnetism and Magnetic Materials (2001)

Qimiao Si

Quantum phases

10.1016/s0304-8853(00)01322-6

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Citations (6)

Coulomb effects at the metal–insulator transition of disordered electrons

Physica B Condensed Matter (1999)

Qimiao Si C. M. Varma

Metal–insulator transition

10.1016/s0921-4526(98)01117-x

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Citations (1)

Anomalous Hall Effect in Frustrated Kondo Lattices and Implications for Heavy Fermion System Pr$_2$Ir$_2$O$_7$

Bulletin of the American Physical Society (2014)

Wenxin Ding Qimiao Si

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Quantum phase transition and destruction of Kondo effect in pressurized SmB6

Science Bulletin (2017)

Yazhou Zhou Qi Wu P. F. S. Rosa Rong Yu Jing Guo

Kondo insulator

Weak localization

10.1016/j.scib.2017.10.008

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Evidence of a Kondo Destroying Quantum Critical Point in YbRh₂Si₂

Journal of the Physical Society of Japan (2014)

F. Steglich Heike Pfau Stefan Lausberg Sandra Hamann Peijie Sun

The heavy-fermion metal YbRh2Si2 is a weak antiferromagnet below TN = 0.07 K. Application of a low magnetic field Bc = 0.06 T (⊥c) is sufficient to continuously suppress the antiferromagnetic (AF) order. Below T ≈ 10 K, the Sommerfeld coefficient of the electronic specific heat γ(T) exhibits a logarithmic divergence. At T < 0.3 K, γ(T) ∼ T−ε (ε: 0.3–0.4), while the electrical resistivity ρ(T) = ρ0 + aT (ρ0: residual resistivity). Upon extrapolating finite-T data of transport and thermodynamic quantities to T = 0, one observes (i) a vanishing of the “Fermi surface crossover” scale $T^{*}$(B), (ii) an abrupt jump of the initial Hall coefficient RH(B) and (iii) a violation of the Wiedemann Franz law at B = Bc, the field-induced quantum critical point (QCP). These observations are interpreted as evidence of a critical destruction of the heavy quasiparticles, i.e., propagating Kondo singlets, at the QCP of this material.

Residual resistivity

Strongly correlated material

10.7566/jpsj.83.061001

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Citations (26)

Energy dependence of the spin excitation anisotropy in uniaxial-strainedBaFe1.9Ni0.1As2

Physical Review B (2015)

Yu Song Xingye Lu D. L. Abernathy David W. Tam J. L. Niedziela

We use inelastic neutron scattering to study the temperature and energy dependence of the spin excitation anisotropy in uniaxial-strained electron-doped iron pnictide ${\mathrm{BaFe}}_{1.9}{\mathrm{Ni}}_{0.1}{\mathrm{As}}_{2}$ near optimal superconductivity (${T}_{c}=20\phantom{\rule{0.28em}{0ex}}\mathrm{K}$). Our work has been motivated by the observation of in-plane resistivity anisotropy in the paramagnetic tetragonal phase of electron-underdoped iron pnictides under uniaxial pressure, which has been attributed to a spin-driven Ising-nematic state or orbital ordering. Here we show that the spin excitation anisotropy, a signature of the spin-driven Ising-nematic phase, exists for energies below $\ensuremath{\sim}60$ meV in uniaxial-strained ${\mathrm{BaFe}}_{1.9}{\mathrm{Ni}}_{0.1}{\mathrm{As}}_{2}$. Since this energy scale is considerably larger than the energy splitting of the ${d}_{xz}$ and ${d}_{yz}$ bands of uniaxial-strained $\mathrm{Ba}{({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x})}_{2}{\mathrm{As}}_{2}$ near optimal superconductivity, spin Ising-nematic correlations are likely the driving force for the resistivity anisotropy and associated electronic nematic correlations.

Tetragonal crystal system

10.1103/physrevb.92.180504

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Citations (18)

Incommensurate Spin Fluctuations in the Spin-triplet Superconductor Candidate UTe2

Bulletin of the American Physical Society (2021)

Chunruo Duan Kalyan Sasmal Jian‐Xin Zhu A. Podlesnyak M Brian Maple

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Orbital-selective Mott phase in multiorbital models for iron pnictides and chalcogenides

Physical review. B./Physical review. B (2017)

Rong Yu Qimiao Si

There is increasing recognition that the multiorbital nature of the 3d electrons is important to the proper description of the electronic states in the normal state of the iron-based superconductors. Earlier studies of the pertinent multiorbital Hubbard models identified an orbital-selective Mott phase, which anchors the orbital-selective behavior seen in the overall phase diagram. An important characteristics of the models is that the orbitals are kinetically coupled -- i.e. hybridized -- to each other, which makes the orbital-selective Mott phase especially nontrivial. A U(1) slave-spin method was used to analyze the model with nonzero orbital-level splittings. Here we develop a Landau free-energy functional to shed further light on this issue. We put the microscopic analysis from the U(1) slave-spin approach in this perspective, and show that the intersite spin correlations are crucial to the renormalization of the bare hybridization amplitude towards zero and the concomitant realization of the orbital-selective Mott transition. Based on this insight, we discuss additional ways to study the orbital-selective Mott physics from a dynamical competition between the interorbital hybridization and collective spin correlations. Our results demonstrate the robustness of the orbital-selective Mott phase in the multiorbital models appropriate for the iron-based superconductors.

10.1103/physrevb.96.125110

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Citations (37)

Effects of spin-orbit coupling and space group symmetry in multiorbital models for iron pnictides

Bulletin of the American Physical Society (2014)

Rong Yu Emilian M. Nica Jian‐Xin Zhu Qimiao Si

Orbit (dynamics)

Spin–orbit interaction

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