Rapid suppression of charge density wave transition in LaSb<sub>2</sub> under pressure

Bud’ko, Sergey L.; Huyan, Shuyuan; Herrera-Siklody, Paula; Canfield, Paul C.

doi:10.1080/14786435.2022.2159561

Cited by 5 publications

(6 citation statements)

References 27 publications

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“…However, additional contributions due to non-hydrostatic pressure conditions caused by the frozen pressure medium cannot be quantified at present. Similar results were recently presented in [21].…”

Section: Resultssupporting

confidence: 92%

“…There has not yet been any direct measurement of CDW order in LaSb 2 . The identification of the α anomaly as a signature of a CDW transition [21] primarily rests on the large linear MR observed in LaSb 2 at low temperature. However, CDW order is neither necessary nor sufficient to explain this phenomenon, as similar linear MR also arises in some Weyl and Dirac semi-metals [22][23][24] characterised by small Fermi surface pockets.…”

Section: Discussionmentioning

confidence: 99%

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Pressure-dependent structural and electronic instabilities in LaSb$_2$

Weinberger

Podesta

Chen

et al. 2023

SciPost Phys. Proc.

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LaSb_22 exhibits a large, non-saturating, linear magnetoresistance at low temperatures, defying the expectations of Fermi liquid theory. This is thought to be caused by charge density wave order emerging below an abrupt, hysteretic anomaly in the resistivity at \sim∼ 355 K. We find that, under hydrostatic pressure, this anomaly becomes much more pronounced, develops strong hysteresis, and shifts rapidly towards lower temperatures. The anomaly is fully suppressed by only 6 kbar. Moreover, we observe a second transition anomaly at lower temperature, which likewise disappears under pressure. These findings are discussed in the context of a structural transition recently discovered in the sister material CeSb_22 and of density functional theory calculations, which indicate that the SmSb_22-type structure adopted by LaSb_22 at ambient conditions is unstable at moderate applied pressures.

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Section: Resultssupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Pressure-dependent structural and electronic instabilities in LaSb$_2$

Weinberger

Podesta

Chen

et al. 2023

SciPost Phys. Proc.

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“…By applying pressure to LaSb 2 , the CDW state is suppressed, and the superconductivity shows dome-like diagram. [31,32] The recent discovery of unconventional superconductivity under pressure in ultraheavy fermion material CeSb 2 stimulated the re-research interest of the RSb 2 family. The dome-type superconductivity appears near a magnetic quantum critical point, and its upper critical field exceeds the conventional Pauli limit eightfold.…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced magnetic phase and structural transition in SmSb₂

Li 李,

Wang 王,

Chen 陈

et al. 2024

Chinese Phys. B

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Motivated by the recent discovery of unconventional superconductivity around a magnetic quantum critical point in pressurized CeSb2, here we present a high-pressure study of an isostructural antiferromagnetic (AFM) SmSb2 through electrical transport and synchrotron x-ray diffraction measurements. At P C ~2.5 GPa, we found a pressure-induced magnetic phase transition accompanied by a Cmca→P4/nmm structural phase transition. In the pristine AFM phase below P C, the AFM transition temperature of SmSb2 is insensitive to pressure; in the emergent magnetic phase above P C, however, the magnetic critical temperature increases rapidly with increasing pressure. In addition, at ambient pressure, the magnetoresistivity (MR) of SmSb2 increases suddenly upon cooling below the AFM transition temperature and presents linear nonsaturating behavior under high field at 2 K. With increasing pressure above P C, the MR behavior remains similar to that observed at ambient pressure, both in terms of temperature- and field-dependent MR. This leads us to argue an AFM-like state for SmSb2 above P C. Within the investigated pressure of up to 45.3 GPa and the temperature of down to1.8 K, we found no signature of superconductivity in SmSb2.

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“…Scanning tunneling microscopy experiments have suggested that the superconductivity is more robust at the surface with a measured T c of 1.2 K . The transition sharpens with P with concomitant suppression of the high-temperature resistance anomaly. , A maximum T c ≈ 2 K was observed under applied pressure of 4.5 kbar, at which point the anomaly is completely absent. , While the presence of a CDW transition in bulk LaSb 2 remains an open question with recent studies having found no evidence of a CDW gap opening, the strongly 2D-like Fermi surface in the other square-net systems such as SmSb 2 -type LaSb 2 is not present in our structure (Figure S8 for discussion), which may play a role in the suppression of the resistance anomaly associated with a structural transition that competes with superconductivity. Further investigations into the superconducting phase will form the basis of future studies.…”

mentioning

confidence: 96%

“…Bulk crystals grown with the self-flux method form large, micaceous crystals with high residual resistivity ratios (RRR) , and nonsaturating positive magnetoresistance (MR). , Pronounced hysteretic electrical resistance when sweeping T is resolved under ambient P conditions. ,− Under application of moderate P , the hysteretic feature is suppressed to low T and is completely absent by P ≈ 12 kbar. Accompanying this suppression is a sharpening of the superconducting (SC) transition under P and an increase in SC critical temperature ( T c ) to a maximum of T c ≈ 2 K. ,, However, due to the micacity of crystals, reliable structural analysis at high P remains challenging and therefore complicates a full understanding of correlation between structural and electronic properties.…”

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confidence: 99%

Monoclinic LaSb₂ Superconducting Thin Films

Llanos,

Campisi,

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et al. 2024

Nano Lett.

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Rare-earth diantimondes exhibit coupling between structural and electronic orders, which are tunable under pressure and temperature. Here we present the discovery of a new polymorph of LaSb 2 stabilized in thin films synthesized using molecular beam epitaxy. Using diffraction, electron microscopy, and first-principles calculations we identify a YbSb 2 -type monoclinic lattice as a yet-uncharacterized stacking configuration. The material hosts superconductivity with a T c = 2 K, which is enhanced relative to the bulk ambient phase, and a long superconducting coherence length of 1730 Å. This result highlights the potential thin film growth has in stabilizing novel stacking configurations in quasi-two-dimensional compounds with competing layered structures.

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Rapid suppression of charge density wave transition in LaSb₂ under pressure

Cited by 5 publications

References 27 publications

Pressure-dependent structural and electronic instabilities in LaSb$_2$

Pressure-dependent structural and electronic instabilities in LaSb$_2$

Pressure-induced magnetic phase and structural transition in SmSb₂

Monoclinic LaSb₂ Superconducting Thin Films

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Rapid suppression of charge density wave transition in LaSb2 under pressure

Cited by 5 publications

References 27 publications

Pressure-dependent structural and electronic instabilities in LaSb$_2$

Pressure-dependent structural and electronic instabilities in LaSb$_2$

Pressure-induced magnetic phase and structural transition in SmSb2

Monoclinic LaSb2 Superconducting Thin Films

Contact Info

Product

Resources

About

Rapid suppression of charge density wave transition in LaSb₂ under pressure

Pressure-induced magnetic phase and structural transition in SmSb₂

Monoclinic LaSb₂ Superconducting Thin Films