Spin density wave order and fluctuations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Mn</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi>Si</mml:mi></mml:mrow></mml:math>: A transport study

Steckel, Frank; Rodan, Steven T.; Hermann, R.; Blum, Christian; Wurmehl, S.; Büchner, B.; Heß, Christian

doi:10.1103/physrevb.90.134411

Cited by 14 publications

(7 citation statements)

References 66 publications

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“…Towards higher T , phonon umklapp processes increasingly limit l, resulting in a broad peak in κ ph followed by a fast decline. For antiferromagnetic insulators it is well known that scattering of phonons off paramagnon fluctuations of the incipient long range order may give rise to a significant suppression of κ ph above and a recovery below the Néel ordering temperature, respectively [29][30][31][32][33]. The whole κ ab (T ) including the observed kink at T N seems perfectly in line with such a scenario.…”

supporting

confidence: 64%

Unusual Phonon Heat Transport in α−RuCl3 : Strong Spin-Phonon Scattering and Field-Induced Spin Gap

et al. 2018

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The honeycomb Kitaev-Heisenberg model is a source of a quantum spin liquid with Majorana fermions and gauge flux excitations as fractional quasiparticles. Here we unveil the highly unusual low-temperature heat conductivity κ of α-RuCl_{3}, a prime candidate for realizing such physics: beyond a magnetic field of B_{c}≈7.5 T, κ increases by about one order of magnitude, both for in-plane as well as out-of-plane transport. This clarifies the unusual magnetic field dependence unambiguously to be the result of severe scattering of phonons off putative Kitaev-Heisenberg excitations in combination with a drastic field-induced change of the magnetic excitation spectrum. In particular, an unexpected, large energy gap arises, which increases linearly with the magnetic field, reaching remarkable ℏω_{0}/k_{B}≈50 K at 18 T.

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confidence: 64%

Unusual Phonon Heat Transport in α−RuCl3 : Strong Spin-Phonon Scattering and Field-Induced Spin Gap

et al. 2018

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“…A further decrease of temperature T leads to a minimum of

ρ false(T false)

\sim 90

K followed by a strong low‐ T upturn. The observed anomalies in the resistivity upon passing through

T_{s}

and

T_{N}

coarsely represent a canonical behavior of the resistivity upon entering the SDW ground state not only of many other iron pnictides such as BaFe 2 As 2 but also other very different SDW compounds like as Mn

_{3}

Si () or Yb

_{2}

_{2}

Pb (). In LaFeAsO 1−x F x , due to the complex interplay of orbital, magnetic, and structural degrees of freedom, the situation is, however, a bit more involved as compared to the transition to a presumably pure SDW state in the latter two compounds.…”

Section: Resultsmentioning

confidence: 83%

“…b. This quantity is known as a sensitive probe for reconstructions of the Fermi surface due to electronic‐nematic or SDW order . Pure lattice effects typically are of secondary importance.…”

Section: Resultsmentioning

confidence: 99%

Nematicity in LaFeAsO_1−xF_x

Heß

Grafe

Kondrat

et al. 2016

Physica Status Solidi (b)

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Orbital ordering has recently emerged as another important state in iron‐based superconductors, and its role for superconductivity as well as its connection to magnetic order and orthorhombic lattice distortion are heavily debated. In order to search for signatures of this so‐called nematic phase in oxypnictides, we revisit the normal state properties of the pnictide superconductor LaFeAsO1−x Fx with a focus on resistivity, Nernst effect, thermal expansion, and 75As nuclear magnetic resonance (NMR) data. The transport properties at the underdoped level x=0.05 exhibit pronounced anomalies at about the same temperature where undoped LaFeAsO develops long‐range nematic ordering, i.e., at about 160 K. Furthermore, the 75As‐NMR spin‐lattice relaxation rate false(T1Tfalse)−1 reveals a progressive slowing down of spin fluctuations. Yet, long‐range magnetic order and also a detectable orthorhombic lattice distortion are absent. Thus, we conclude from the data that short‐range orbital‐nematic ordering or a slowly fluctuating form of it sets in near 160 K. Remarkably, all anomalies in the transport and also the indications of slow spin fluctuations disappear close to optimal doping x=0.1 which suggests that in LaFeAsO1−x Fx the nematic phase actually competes with superconductivity. Schematic electronic phase diagram of LaFeAsO1−x Fx.

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“…However for Y-0.0 it was found the resistivity decreases as temperature is reduced below the gap. The observed decrease in resistivity is probably due to the reduction of the scattering rate which overcompensate the depletion of the carriers [31]. With Y-substitution the gap opening is suppressed below 1.8 K. Hence the decrease in resistivity with reduction in temperature is not observed in these compounds, and it is found that resistivity increases with Y-substitution, which might be due to increasing spin disorder and residual resistivity.…”

Section: (B)mentioning

confidence: 88%

Evidence of partial gap opening and Ce-site dilution effects in a heavy fermion compound CeNiGe₂

Singh

Mukherjee

2018

Philosophical Magazine

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We report the results of magnetization, non-linear dc susceptibility, electrical transport, and heat capacity measurements on Y-substituted heavy fermion CeNiGe 2 . Investigations are carried out on the compounds CeNiGe 2 , Ce 0.9 Y 0.1 NiGe 2 , Ce 0.8 Y 0.2 NiGe 2 and Ce 0.6 Y 0.4 NiGe 2 . It is observed that with the increase in Y-concentration, the magnetic ordering temperature decreases.For CeNiGe 2 , below ordering temperature Arrott plots suggest the presence of spin density wave (SDW). Third and fifth order dc susceptibility indicates magnetic instability which possibly leads to partial gap opening resulting in the observation of SDW. These observations are further investigated through resistivity and heat capacity measurements which also point toward partial gap opening in CeNiGe 2 . Interestingly, with the increase in Y-substitution, it is noted that the gap opening is suppressed and also shifted towards lower temperature. Moreover, our investigations reveal absence of non-Fermi liquid behavior or zero field quantum critical point even after 40% dilution of Ce-site.

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Spin density wave order and fluctuations inMn3Si: A transport study

Cited by 14 publications

References 66 publications

Unusual Phonon Heat Transport in α−RuCl3 : Strong Spin-Phonon Scattering and Field-Induced Spin Gap

Unusual Phonon Heat Transport in α−RuCl3 : Strong Spin-Phonon Scattering and Field-Induced Spin Gap

Nematicity in LaFeAsO_1−xF_x

Evidence of partial gap opening and Ce-site dilution effects in a heavy fermion compound CeNiGe₂

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Spin density wave order and fluctuations inMn3Si: A transport study

Cited by 14 publications

References 66 publications

Unusual Phonon Heat Transport in α−RuCl3 : Strong Spin-Phonon Scattering and Field-Induced Spin Gap

Unusual Phonon Heat Transport in α−RuCl3 : Strong Spin-Phonon Scattering and Field-Induced Spin Gap

Nematicity in LaFeAsO1−xFx

Evidence of partial gap opening and Ce-site dilution effects in a heavy fermion compound CeNiGe2

Contact Info

Product

Resources

About

Nematicity in LaFeAsO_1−xF_x

Evidence of partial gap opening and Ce-site dilution effects in a heavy fermion compound CeNiGe₂