Zero resistance and strange metal behavior of high-temperature superconducting material La3Ni2O7

YE Kaixin; ZHANG Yanan; JIAO Lin; YUAN Huiqiu

doi:10.7498/aps.75.20251207

Abstract

In 2023, signatures of pressure-induced high-temperature superconductivity with an onset transition at 80 K were observed in La₃Ni₂O₇. However, the absence of zero resistance cast doubts on its superconductivity. By using a recently developed quasi-hydrostatic pressure technique based on a diamond anvil cell, our group successfully observe a sharp superconducting transition with a zero resistance below 40 K, providing a crucial evidence for establishing the existence of high-temperature superconductivity in La₃Ni₂O₇. Furthermore, a pronounced linear-temperature dependent resistivity is observed above its superconducting transition, suggesting an unconventional nature of its superconducting pairing state.In addition to the discovery of zero resistance, our transport study also revises the pressure-temperature phase diagram of La₃Ni₂O₇. It is found that La₃Ni₂O₇ remains metallic under pressure and there is no evidence for a metal-insulator transition if the samples are properly handled during preparations. Upon increasing pressure, the density wave transition, observed near 130 K at ambient pressure, is quickly suppressed. At approximately 13.7 GPa, evidence for a pressure-induced structural phase transition is observed near 250 K, followed by a superconducting transition with an onset temperature at $ T_{\mathrm{c}}^{\text{onset}}\approx $ 37.5 K. $ {T}_{\mathrm{c}} $ initially increases with the increase of pressure, reaching a maximum value of $ T_{\mathrm{c}}^{\text{onset}}\approx $ 66 K at 20.5 GPa. On the other hand, the slope $ {A}' $ of the T-linear resistivity above $ {T}_{\mathrm{c}} $ monotonically decreases with the increase of pressure, showing a relation of $ {T}_{\mathrm{c}}\propto \sqrt{{A}'} $ above 20.5 GPa, which is similar to those recently observed in the cuprate superconductors. Furthermore, the inverse Hall coefficient 1/R_H, derived from the Hall resistance measurements, reveals a notable increase at pressures above 15 GPa upon entering the high pressure phase, suggesting a substantial increase of the carrier concentration in the superconducting regime, which is further supported by band structure calculations.In this work, we present a brief summary of our research advances, and compare them with those observed in other nickelate superconductors.

Keywords:

nickelate high-temperature superconductivity /
zero resistance /
strange metal /
pressure

Authors and contacts

1.
Center for Correlated Matter, Zhejiang University, Hangzhou 310058, China
2.
School of Physics, Zhejiang University, Hangzhou 310058, China

Corresponding author: JIAO Lin, lin.jiao@zju.edu.cn ; YUAN Huiqiu, hqyuan@zju.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 12494592, 12034017) and the National Key Research and Development Program of China (Grant No. 2022YFA1402200).

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References

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Cited By

图 1 (a) La_n+1Ni_nO_3n+1和(b) La_n+1Ni_nO_2n+2的晶体结构

Figure 1. Crystal structure of (a) La_n+1Ni_nO_3n+1 and (b) La_n+1Ni_nO_2n+2.

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图 2 $ {\text{La}}_{3}{\text{Ni}}_{2}{\mathrm{O}}_{7-\delta } $中的超导迹象^[23]

Figure 2. Signatures of superconductivity in $ {\text{La}}_{3}{\text{Ni}}_{2}{\mathrm{O}}_{7-\delta } $^[23].

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图 3 (a) 金刚石对顶砧压力胞示意图; (b) 压腔内部示意图; (c) 显微镜下高压腔体内部照片

Figure 3. (a) Schematic diagram of the diamond anvil cell; (b) schematic diagram of the pressure chamber; (c) photo of the pressure chamber under a microscope.

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图 4 La₃Ni₂O₇单晶在20.5 GPa压力下, 电阻随温度的变化曲线^[24]

Figure 4. The R-T curve of single crystal La₃Ni₂O₇ at 20.5 GPa ^[24].

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图 5 $ {\text{La}}_{3}{\text{Ni}}_{2}{\mathrm{O}}_{7-\delta } $单晶样品S1-1, S1-2, S1-3在压力下的电阻曲线^[24]

Figure 5. Resistance curves of $ {\text{La}}_{3}{\text{Ni}}_{2}{\mathrm{O}}_{7-\delta } $ single crystal samples S1-1, S1-2, and S1-3 under pressure^[24].

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图 6 $ {\text{La}}_{3}{\text{Ni}}_{2}{\mathrm{O}}_{7-\delta } $单晶样品S2-1, S2-2, S2-3, S2-4在压力下的电阻曲线^[24]

Figure 6. Resistance curves of $ {\text{La}}_{3}{\text{Ni}}_{2}{\mathrm{O}}_{7-\delta } $ single crystal samples S2-1, S2-2, S2-3, and S2-4 under pressure^[24].

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图 7 (a) 超导转变与线性电阻行为随压力的演化, 为清晰起见, 电阻曲线在垂直方向上进行了等量平移^[24]; (b) 归一化的$ \sqrt{{A}{'}} $与临界温度$ {T}_{\mathrm{c}} $的关系^[24]

Figure 7. (a) Evolution of superconducting transition and linear resistance behavior with pressure, for clarity, the resistance curves have been shifted equally in the vertical direction^[24]; (b) relationship between normalized $ \sqrt{{A}{'}} $ and critical temperature $ {T}_{\mathrm{c}} $^[24].

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图 8 (a) 在0—2 GPa压力范围内, La₃Ni₂O₇电阻曲线随压力演化^[24]; (b) 电阻微分曲线. 为清晰起见, 曲线进行了等量偏移^[24]

Figure 8. (a) Resistance curves of La₃Ni₂O₇ with pressure from 0 GPa to 2 GPa^[24]; (b) the differential resistance curves. For clarity, the curves have been shifted equally^[24].

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图 9 (a) La₃Ni₂O₇单晶样品在13.7 GPa的升降温电阻曲线, 其中红色对应于升温过程, 黑色对应于降温过程^[24]; (b) 常压条件下La₃Ni₂O₇多晶样品的升降温电阻曲线, 该化合物在550 K发生结构相变^[45]

Figure 9. (a) Resistance curves of La₃Ni₂O₇ single crystal at 13.7 GPa, where the red curve represents the heating process and the black one represents the cooling process^[24]; (b) resistance curves of La₃Ni₂O₇ polycrystalline sample under ambient pressure, it undergoes a structural phase transition at 550 K^[45].

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图 10 霍尔系数的倒数$ 1/{R}_{\mathrm{H}} $随压力的演化, 结构转变区域用斜纹突出显示^[24]

Figure 10. Evolution of the reciprocal of the Hall coefficient $ 1/{R}_{\mathrm{H}} $ with pressure, and the structural transformation region is highlighted by dashed lines^[24].

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图 11 La₃Ni₂O₇的温度-压力相图, 低压的密度波(DW)转变随压力增加被逐渐抑制; 压力下, La₃Ni₂O₇发生Amam至I4mmm的结构转变, 虚线示意了可能的结构相变. 高温超导和奇异金属相出现于高压的I4mmm结构相

Figure 11. Temperature-pressure phase diagram of La₃Ni₂O₇, the density wave transition is gradually suppressed with increasing pressure, La₃Ni₂O₇ undergoes a structural transformation from Amam to I4mmm, and the dotted line indicates the possible phase boundary between these two structures. High-temperature superconductivity and strange metal phase occur in the I4mmm structure.

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图 12 (a) $ {\text{La}}_{4}{\text{Ni}}_{3}{\mathrm{O}}_{10} $的温度-压力相图^[39]; (b) $ {\text{La}}_{5}{\text{Ni}}_{3}{\mathrm{O}}_{11} $的温度-压力相图^[40]; (c) $ {\Pr }_{4}{\text{Ni}}_{3}{\mathrm{O}}_{10} $的温度-压力相图^[72]

Figure 12. Temperature-pressure phase diagram of (a) $ {\text{La}}_{4}{\text{Ni}}_{3}{\mathrm{O}}_{10} $^[39], (b) $ {\text{La}}_{5}{\text{Ni}}_{3}{\mathrm{O}}_{11} $^[40] and (c) $ {\Pr }_{4}{\text{Ni}}_{3}{\mathrm{O}}_{10} $^[72].

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Zero resistance and strange metal behavior of high-temperature superconducting material La₃Ni₂O₇