Electronic nematicity and its relation to quantum criticality in Sr3Ru2O7 studied by thermal expansion

Stingl, C.; Perry, Robin; Maeno, Y.; Gegenwart, P.

doi:10.1002/pssb.201200905

Cited by 9 publications

(11 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There is a clear resistive anomaly associated with the second metamagnetic transition at ≈ 8.1 T, which separates regions of the phase denoted A and B. The existence of the B region is indicated by transport, thermal expansion, and neutron scattering measurements, [33,35,43] however the thermodynamic signatures of phase formation are much weaker than for the A region [44]. width of ≈ 0.08% strain.…”

Section: Results: Uniaxial Pressurementioning

confidence: 99%

“…The neutron study does not address this question because the scattering peaks could arise either from separate domains of (100)-and (010)-oriented spin density waves, or their microscopic coexistence. Thermodynamic measurements do not offer a definitive resolution either: although the transition into the phase with temperature is well-established to be second-order [10,34,35], indicating a broken symmetry, it could be the translation symmetry breaking indicated by the neutron data, and not necessarily C 4 to C 2 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Strain and vector magnetic field tuning of the anomalous phase in Sr ₃ Ru ₂ O ₇

et al. 2017

View full text Add to dashboard Cite

show abstract

Section: Results: Uniaxial Pressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strain and vector magnetic field tuning of the anomalous phase in Sr ₃ Ru ₂ O ₇

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The lower and upper critical fields of SDW-A correspond respectively to H M2 and H M3 . Additionally, another SDW "phase B" has been observed in between H M3 and 8.3 T [12,14]. The observed incommensurate ordering vectors in both SDW phases have been related to Fermi surface nesting [12].…”

mentioning

confidence: 99%

Multiple Metamagnetic Quantum Criticality inSr3Ru2O7
Tokiwa
¹
,
Mchalwat
²
,
Perry
³

et al. 2016
Phys. Rev. Lett.
Self Cite
23
4
23
1
View full text Add to dashboard Cite

Bilayer strontium ruthenate Sr 3 Ru 2 O 7 displays pronounced non-Fermi liquid behavior at magnetic fields around 8 T, applied perpendicular to the ruthenate planes, which previously has been associated with an itinerant metamagnetic quantum critical end point (QCEP). We focus on the magnetic Grüneisen parameter Γ H , which is the most direct probe to characterize field-induced quantum criticality. We confirm quantum critical scaling due to a putative two-dimensional QCEP near 7.845(5) T, which is masked by two ordered phases A and B, identified previously by neutron scattering. In addition we find evidence for a QCEP at 7.53(2) T and determine the quantum critical regimes of both instabilities and the effect of their superposition.Quantum criticality denotes critical behavior that is associated with continuous transformations of matter at zero temperature. Due to the absence of thermal fluctuations at T = 0 it is qualitatively different from classical criticality [1]. In metals the unconventional excitation spectrum near a quantum critical point (QCP) causes the breakdown of Fermi liquid (FL) behavior and its intimate relation to exotic states, such as unconventional superconductivity, adds even more importance to this topic. To date, the influence of quantum critical magnetic excitations on electrons in a metal is far from being understood. For instance the applicability of the itinerant Hertz-Millis-Moriya theory on f -electron based Kondo lattice systems has been disproved by several experiments [2] and alternative descriptions are not fully established yet. Quantum criticality related to itinerant metamagnetism is exceptional in the sense, that electronic degrees of freedom are irrelevant, and a quantitative application to experimental results should be possible [3].The generic metamagnetic quantum critical end point (QCEP) arises from the suppression to T = 0 of the end point of a line of first-order metamagnetic transitions in temperature-field phase space by tuning e.g. composition, pressure or the magnetic field orientation [3]. Metamagnetic QCEPs have been realized in the f -electron based compounds CeRu 2 Si 2 [4,5] We focus on bilayer strontium ruthenate Sr 3 Ru 2 O 7 . Magnetization of this compound along the tetragonal c-axis at low temperature exhibits three successive super-linear, i.e. metamagnetic, rises at µ 0 H M1 =7.5 T, µ 0 H M2 =7.85 T and µ 0 H M3 =8.1 T [9]. The first one is a metamagnetic cross-over (M1). The second and third ones are first order metamagnetic transitions (M2 and M3), ending at critical temperatures of about 1 and 0.5 K, respectively [10]. A line of second-order thermal phase transitions, connecting the critical end points of M2 and M3, has been discovered in electrical resistivity and thermodynamic experiments [10,11], which recently by neutron scattering has been identified as phase boundary of a spindensity-wave (SDW) "phase A" [12, 13] (see Fig. 1.). The lower and upper critical fields of SDW-A correspond respectively to H M2 and H M3 . Additionally, another SDW "ph...

show abstract

“…Unlike the corresponding LFL entropy, which vanishes linearly as T → 0, the term S 0 produces a Tindependent thermal expansion coefficient [15,[28][29][30]. That T -independent behavior is observed in measurements on CeCoIn 5 [31][32][33] [35,36] and confirm the existence of flat bands [12]. In the theory of fermion condensation, the degeneracy of the NFL ground state is removed at any finite temperature, since the flat band acquires a small dispersion [23] …”

Section: Fermion Condensationmentioning

confidence: 94%

Flat bands and enigma of metamagnetic quantum critical regime in Sr3Ru2O7

et al. 2013

View full text Add to dashboard Cite

Understanding the nature of field-tuned metamagnetic quantum criticality in the ruthenate Sr3Ru2O7 has presented a significant challenge within condensed matter physics. It is known from experiments that the entropy within the ordered phase forms a peak, and is unexpectedly higher than that outside, while the magnetoresistivity experiences steep jumps near the ordered phase. We find a challenging connection between Sr3Ru2O7 and heavy-fermion metals expressing universal physics that transcends microscopic details. Our construction of the T − B phase diagram of Sr3Ru2O7 permits us to explain main features of the experimental one, and unambiguously implies an interpretation of its extraordinary low-temperature thermodynamic in terms of fermion condensation quantum phase transition leading to the formation of a flat band at the restricted range of magnetic fields B. We show that it is the flat band that generates both the entropy peak and the resistivity jumps at the QCPs.

show abstract

Electronic nematicity and its relation to quantum criticality in Sr₃Ru₂O₇ studied by thermal expansion

Cited by 9 publications

References 28 publications

Strain and vector magnetic field tuning of the anomalous phase in Sr ₃ Ru ₂ O ₇

Strain and vector magnetic field tuning of the anomalous phase in Sr ₃ Ru ₂ O ₇

Multiple Metamagnetic Quantum Criticality inSr3Ru2O7
Tokiwa
¹
,
Mchalwat
²
,
Perry
³

et al. 2016
Phys. Rev. Lett.
Self Cite
23
4
23
1
View full text Add to dashboard Cite

Flat bands and enigma of metamagnetic quantum critical regime in Sr3Ru2O7

Contact Info

Product

Resources

About

Electronic nematicity and its relation to quantum criticality in Sr3Ru2O7 studied by thermal expansion

Cited by 9 publications

References 28 publications

Strain and vector magnetic field tuning of the anomalous phase in Sr 3 Ru 2 O 7

Strain and vector magnetic field tuning of the anomalous phase in Sr 3 Ru 2 O 7

Multiple Metamagnetic Quantum Criticality inSr3Ru2O7Tokiwa1, Mchalwat2, Perry3 et al. 2016Phys. Rev. Lett.Self Cite234231View full textAdd to dashboardCite

Flat bands and enigma of metamagnetic quantum critical regime in Sr3Ru2O7

Contact Info

Product

Resources

About

Electronic nematicity and its relation to quantum criticality in Sr₃Ru₂O₇ studied by thermal expansion

Strain and vector magnetic field tuning of the anomalous phase in Sr ₃ Ru ₂ O ₇

Strain and vector magnetic field tuning of the anomalous phase in Sr ₃ Ru ₂ O ₇

Multiple Metamagnetic Quantum Criticality inSr3Ru2O7
Tokiwa
¹
,
Mchalwat
²
,
Perry
³

et al. 2016
Phys. Rev. Lett.
Self Cite
23
4
23
1
View full text Add to dashboard Cite