Multiple Charge Density Waves and Superconductivity Nucleation at Antiphase Domain Walls in the Nematic Pnictide 
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Lee, Sangjun; Collini, John; Sun, Stella; Mitrano, Matteo; Guo, Xuefei; Eckberg, Chris; Paglione, Johnpierre; Fradkin, Eduardo; Abbamonte, Peter

doi:10.1103/physrevlett.127.027602

Cited by 27 publications

(22 citation statements)

References 25 publications

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“…Alternatively, domain boundaries of a period-2 charge order could exhibit enhanced filamentary superconductivity, leading to a broad superconducting transition in R(T ). Such a picture was invoked to account for enhanced supercon- ductivity seen in the period-2 charge order phase of Ba 1−x Sr x Ni 2 As 2 , while such an effect is absent for the period-3 charge order phase in the same material series [31]. Given the charge order in AV 3 Sb 5 is period-2 in the ab-plane [2], such a mechanism may also contribute to its broadened superconducting transition under ambient and low pressures, when the charge order is substantial.…”

Section: Resultsmentioning

confidence: 99%

Evolution of superconductivity and charge order in pressurized RbV$_3$Sb$_5$

Du,

Luo,

et al. 2021

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The kagome metals AV3Sb5 (A = K, Rb, Cs) under ambient pressure exhibit an unusual charge order, from which superconductivity emerges. In this work, by applying hydrostatic pressure using a liquid pressure medium and carrying out electrical resistance measurements for RbV3Sb5, we find the charge order becomes suppressed under a modest pressure pc (1.4 < pc < 1.6 GPa), while the superconducting transition temperature Tc is maximized. Tc is then gradually weakened with further increase of pressure, before exhibiting another maxima around 22.8 GPa, signifying the presence of a second superconducting dome. Distinct normal state resistance anomalies are found to be associated with the second superconducting dome, similar to KV3Sb5. Our findings point to qualitatively similar temperature-pressure phase diagrams in KV3Sb5 and RbV3Sb5, suggesting a link between the second superconducting dome and the high-pressure resistance anomalies in the AV3Sb5 series. I. INTRODUCTIONThe kagome metals AV 3 Sb 5 (A = K, Rb, Cs) [1-4] have drawn significant interest recently, with focus on (1) superconductivity with topological surfaces states [2], which raises the prospects of realizing topological superconductivity and Majorana zero modes [5,6]; (2) a large anomalous Hall effect in the absence of local moments [7-9], which possibly results from a charge order that breaks time-reversal symmetry [10,11]; (3) nature of the superconducting pairing, with evidence for nodeless superconducting gaps [12-14], as well as indications for nematic superconductivity [15]; and (4) sensitivity of superconductivity and charge order to pressure-tuning [16][17][18][19][20][21][22][23], likely related to the presence of competing instabilities on the kagome lattice [24][25][26][27][28].With the application of pressure, the charge order becomes quickly suppressed and superconductivity is enhanced, forming a superconducting dome with maximal T c near the pressure at which charge order disappears [16][17][18][19][20][21][22]. While this superconducting dome can be understood to result from the competition between superconductivity and charge order, a second superconducting dome is found in AV 3 Sb 5 at higher pressures [16,[19][20][21][22], whose origin remains unclear. Factors that may be relevant for formation of the second superconducting dome include a pressure-induced Lifshitz transition [20], magnetism suppressing superconductivity in the region between the two superconducting domes [29], reconstruction of the Sb bands due to the formation of interlayer Sb-Sb bonds [30], and a distinct highpressure phase revealed through resistivity anomalies [19]. While two-dome superconductivity is found in all AV 3 Sb 5 materials via resistivity measurements [22], studies of the corresponding normal state from which superconductivity emerges has been limited [19,20]. In particular, it remains unclear whether resistivity anomalies associated with a high-pressure phase in KV 3 Sb 5 [19] is also present in RbV 3 Sb 5 and CsV 3 Sb 5 .In addition, single crystal diffra...

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Section: Resultsmentioning

confidence: 99%

Evolution of superconductivity and charge order in pressurized RbV$_3$Sb$_5$

Du,

Luo,

et al. 2021

Preprint

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“…At room temperature, BaNi 2 As 2 has a tetragonal crystal structure (space group I4/mmm) similar to BaFe 2 As 2 , but unlike its Fe-counterpart, is superconducting, albeit below a modest critical temperature T c ∼ 0.6 K 14 . While earlier electronic structure studies concluded low electronic correlations in this system, pointing at conventional phonon-mediated BCS superconductivity 15,16 , more recent investigations advocate for an exotic normal state, which exhibits a manifold of charge density waves (CDW) instabilities and structural phase transitions interesting in their own right [17][18][19][20][21][22][23][24] , and possible nematic-driven superconducting pairing 25 . No long-range magnetic order has been reported so far, and it has been argued that CDW plays a role similar to that of magnetism in the Fe-based superconductors, making BaNi 2 As 2 a 'charge analogue' of BaFe 2 As 2 .…”

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confidence: 97%

An electronic nematic liquid in BaNi2As2

et al. 2022

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Understanding the organizing principles of interacting electrons and the emergence of novel electronic phases is a central endeavor of condensed matter physics. Electronic nematicity, in which the discrete rotational symmetry in the electron fluid is broken while the translational one remains unaffected, is a prominent example of such a phase. It has proven ubiquitous in correlated electron systems, and is of prime importance to understand Fe-based superconductors. Here, we find that fluctuations of such broken symmetry are exceptionally strong over an extended temperature range above phase transitions in $${{{{{\rm{Ba}}}}}}{{{{{{\rm{Ni}}}}}}}_{2}{({{{{{{\rm{As}}}}}}}_{1-x}{{{{{{\rm{P}}}}}}}_{x})}_{2}$$ Ba Ni 2 ( As 1 − x P x ) 2 , the nickel homologue to the Fe-based systems. This lends support to a type of electronic nematicity, dynamical in nature, which exhibits a particularly strong coupling to the underlying crystal lattice. Fluctuations between degenerate nematic configurations cause splitting of phonon lines, without lifting degeneracies nor breaking symmetries, akin to spin liquids in magnetic systems.

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“…The exact nature of this I-CDW is currently under intense investigation. The reciprocal space pattern of the I-CDW superlattice peaks reported by X-ray diffraction experiments indicated that the charge modulation is unidirectional 26,27,29,30 . Thus, it has been initially linked to a breaking of the crystal lattice rotational symmetry 29,31 .…”

Section: Introductionmentioning

confidence: 95%

“…Although, from a wide reciprocal lattice mapping it has been later suggested that, overall, the I-CDW is a symmetric, biaxial, rotationally invariant state 30 , a clear rotational symmetry breaking has been recently observed within the I-CDW phase by highresolution thermal expansion measurements 26,32 . At a slightly lower temperature, a commensurate uniaxial charge density wave (C-CDW) develops at the expense of the former [26][27][28][29][30] and is associated with a first-order triclinic structural transition at T tri ≈ 137 K. This latter coincident transition is suppressed through numerous chemical substitutions at a critical value, x c [25][26][27]29,30,33,34 . Despite the absence of static magnetism down to the lowest investigated temperature 35 possible indications for electronic nematicity have been reported.…”

Section: Introductionmentioning

confidence: 99%

Elastoresistivity in the incommensurate charge density wave phase of BaNi2(As1−xPx)2

et al. 2022

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Electronic nematicity, the breaking of the crystal lattice rotational symmetry by the electronic fluid, is a fascinating quantum state of matter. In this work, using electronic transport under strain we investigate the electronic nematicity of BaNi2(As1−xPx)2, a candidate system for charge-induced nematicity. We report a large B1g elastoresistance coefficient that is maximized at the tetragonal-to-orthorhombic transition temperature, that slightly precedes the first-order triclinic transition. An hysteretic behavior is observed in the resistance versus strain sweeps and interpreted as the pinning of orthorhombic domains. Remarkably, the elastoresistance only onsets together with a strong enhancement of the incommensurate charge density wave of the material, strongly suggesting that this electronic instability is uniaxial in nature and drive the orthorhombic transition. The absence of sizeable elastoresistance above this electronic phase clearly contrasts dynamic and static electronic nematicity. Finally, the elastoresistance temperature dependence that strongly differs from the Curie-Weiss form of iron-based superconductors reveals major differences for the respective coupling of electronic nematicity to the lattice. Our results uncover an extremely strain-sensitive platform to study electronic anisotropy induced by a charge-density-wave instability.

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Multiple Charge Density Waves and Superconductivity Nucleation at Antiphase Domain Walls in the Nematic Pnictide Ba1−xSrxNi

Cited by 27 publications

References 25 publications

Evolution of superconductivity and charge order in pressurized RbV$_3$Sb$_5$

Evolution of superconductivity and charge order in pressurized RbV$_3$Sb$_5$

An electronic nematic liquid in BaNi2As2

Elastoresistivity in the incommensurate charge density wave phase of BaNi2(As1−xPx)2

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