Avoided quantum criticality and magnetoelastic coupling in BaFe$_{2-x}$Ni$_{x}$As$_{2}$

Xingye Lu; H. Gretarsson; Rui Zhang; Xuerong Liu; Huiqian Luo; Wei Tian; Mark Laver; Z. Yamani; Young-June Kim; A. H. Nevidomskyy; Qimiao Si; Pengcheng Dai

doi:10.1103/PhysRevLett.110.257001

Avoided quantum criticality and magnetoelastic coupling in BaFe$_{2-x}$Ni$_{x}$As$_{2}$

Xingye Lu, H. Gretarsson, Rui Zhang, Xuerong Liu, Huiqian Luo, Wei Tian, Mark Laver, Z. Yamani, Young-June Kim, A. H. Nevidomskyy, Qimiao Si, Pengcheng Dai

Metallurgy and Materials

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63 Citations (Scopus)

Abstract

We study the structural and magnetic orders in electron-doped BaFe2-xNixAs2 by high-resolution synchrotron X-ray and neutron scatterings. Upon Ni-doping x, the nearly simultaneous tetragonal-to-orthorhombic structural T_s and antiferromagnetic (T_N) phase transitions in BaFe2As2 are gradually suppressed and separated, resulting in T_s>T_N with increasing x as was previously observed. However, the temperature separation between T_s and T_N decreases with increasing x for x> 0.065$, tending towards a quantum bi-critical point near optimal superconductivity at x=0.1. The zero-temperature transition is preempted by the formation of a secondary incommensurate magnetic phase in the region 0.088

Original language	English
Journal	Physical Review Letters
DOIs	https://doi.org/10.1103/PhysRevLett.110.257001
Publication status	Published - 18 Jun 2013

Keywords

cond-mat.supr-con

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10.1103/PhysRevLett.110.257001

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title = "Avoided quantum criticality and magnetoelastic coupling in BaFe$_{2-x}$Ni$_{x}$As$_{2}$",

abstract = "We study the structural and magnetic orders in electron-doped BaFe2-xNixAs2 by high-resolution synchrotron X-ray and neutron scatterings. Upon Ni-doping x, the nearly simultaneous tetragonal-to-orthorhombic structural T_s and antiferromagnetic (T_N) phase transitions in BaFe2As2 are gradually suppressed and separated, resulting in T_s>T_N with increasing x as was previously observed. However, the temperature separation between T_s and T_N decreases with increasing x for x> 0.065$, tending towards a quantum bi-critical point near optimal superconductivity at x=0.1. The zero-temperature transition is preempted by the formation of a secondary incommensurate magnetic phase in the region 0.088",

keywords = "cond-mat.supr-con",

author = "Xingye Lu and H. Gretarsson and Rui Zhang and Xuerong Liu and Huiqian Luo and Wei Tian and Mark Laver and Z. Yamani and Young-June Kim and Nevidomskyy, {A. H.} and Qimiao Si and Pengcheng Dai",

year = "2013",

month = jun,

day = "18",

doi = "10.1103/PhysRevLett.110.257001",

language = "English",

journal = "Physical Review Letters",

issn = "0031-9007",

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TY - JOUR

T1 - Avoided quantum criticality and magnetoelastic coupling in BaFe$_{2-x}$Ni$_{x}$As$_{2}$

AU - Lu, Xingye

AU - Gretarsson, H.

AU - Zhang, Rui

AU - Liu, Xuerong

AU - Luo, Huiqian

AU - Tian, Wei

AU - Laver, Mark

AU - Yamani, Z.

AU - Kim, Young-June

AU - Nevidomskyy, A. H.

AU - Si, Qimiao

AU - Dai, Pengcheng

PY - 2013/6/18

Y1 - 2013/6/18

N2 - We study the structural and magnetic orders in electron-doped BaFe2-xNixAs2 by high-resolution synchrotron X-ray and neutron scatterings. Upon Ni-doping x, the nearly simultaneous tetragonal-to-orthorhombic structural T_s and antiferromagnetic (T_N) phase transitions in BaFe2As2 are gradually suppressed and separated, resulting in T_s>T_N with increasing x as was previously observed. However, the temperature separation between T_s and T_N decreases with increasing x for x> 0.065$, tending towards a quantum bi-critical point near optimal superconductivity at x=0.1. The zero-temperature transition is preempted by the formation of a secondary incommensurate magnetic phase in the region 0.088

AB - We study the structural and magnetic orders in electron-doped BaFe2-xNixAs2 by high-resolution synchrotron X-ray and neutron scatterings. Upon Ni-doping x, the nearly simultaneous tetragonal-to-orthorhombic structural T_s and antiferromagnetic (T_N) phase transitions in BaFe2As2 are gradually suppressed and separated, resulting in T_s>T_N with increasing x as was previously observed. However, the temperature separation between T_s and T_N decreases with increasing x for x> 0.065$, tending towards a quantum bi-critical point near optimal superconductivity at x=0.1. The zero-temperature transition is preempted by the formation of a secondary incommensurate magnetic phase in the region 0.088

KW - cond-mat.supr-con

U2 - 10.1103/PhysRevLett.110.257001

DO - 10.1103/PhysRevLett.110.257001

M3 - Article

SN - 0031-9007

JO - Physical Review Letters

JF - Physical Review Letters

ER -

Avoided quantum criticality and magnetoelastic coupling in BaFe$_{2-x}$Ni$_{x}$As$_{2}$

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