Pressure studies on the electrical properties in R2-xSrxNi1-yCuyO4+δ(R=La, Nd) and La3Ni2O7+δ

Hosoya, Teppei; Igawa, Kazumi; Takeuchi, Yoichi; Yoshida, Kōji; Uryu, Takeshi; Hirabayashi, Hideaki; Takahashi, Hiroki

doi:10.1088/1742-6596/121/5/052013

Cited by 17 publications

(5 citation statements)

References 20 publications

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“…Previous HP studies on polycrystalline La3Ni2O7 samples have revealed that its transport properties are sensitive to pressure conditions, i.e., hydrostatic versus non-hydrostatic pressure. [25] In this work, therefore, we carried out a comparative study on the transport properties of La3Ni2O7 crystals using two distinct HP techniques under different pressure conditions, i.e., a DAC and a cubic anvil cell (CAC) employing a solid (KBr) and liquid (glycerol) pressure-transmitting medium (PTM), respectively. For measurements in a DAC, the results are consistent with the recent report of Sun et al [19] Remark-ably, measurements in a CAC under excellent hydrostatic pressure conditions have revealed distinct evolution of the metallic transport properties and the gradual development of a resistance drop in the pressure range between 11 GPa and 15 GPa, partially addressing the above-mentioned issues (ii) and (iii).…”

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confidence: 99%

“…Previous HP studies on the transport properties of La3Ni2O7 polycrystalline samples have shown that both resistance and 𝑇s decrease monotonically with pressure below 2 GPa with a slope of 𝑑𝑇s/𝑑𝑃 = 10.7-12.5 K•GPa −1 , which would predict a complete suppression of 𝑇s at ∼ 10 GPa. [25] For the above HP resistance measurements in the DAC, the metallic behavior has unfortunately been altered by the non-hydrostatic pressure conditions, thus preventing us from observing intrinsic evolution of the transport properties under HP. To overcome this problem, we resorted to the CAC technique, which employs a three-axis compression geometry and adopts a liquid PTM to maintain excellent hydrostatic pressure conditions up to 15 GPa.…”

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Emergence of High-Temperature Superconducting Phase in Pressurized La₃Ni₂O₇ Crystals

Hou 侯,

Yang 杨,

Liu 刘

et al. 2023

Chinese Phys. Lett.

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The recent report of pressure-induced structure transition and signature of superconductivity with T c≈80 K above 14 GPa in the La3Ni2O7 crystals has garnered considerable attention. To further elaborate this discovery, we carried out comprehensive resistance measurements on the La3Ni2O7 crystals grown with the optical-image floating zone furnace under oxygen pressure (15 bar) by using the diamond anvil cell (DAC) and cubic anvil cell (CAC), which employs the solid (KBr) and liquid (Glycerol) pressure transmitting medium, respectively. For the sample #1 measured in DAC, it exhibits a semiconducting-like behavior with large resistance at low pressures and becomes metallic gradually upon compression. At the pressures P≥13.7 GPa, we observed the appearance of resistance drop as large as ~50% around 70 K, which evolves into a kink-like anomaly at pressures above 40 GPa and shifts to lower temperatures gradually with increasing magnetic field. These observations are consistent with the recent report mentioned above. On the other hand, the sample #2 measured in CAC retains the metallic behavior in the investigated pressure range up to 15 GPa. The hump-like anomaly in resistance around ~130 K at ambient pressure disappears at P≥2 GPa. In the pressure range from 11 GPa to 15 GPa, we observed the gradual development of a shoulder-like anomaly in resistance at low temperatures, which evolves into a pronounced drop of resistance by 98% below 62 K at 15 GPa, reaching a temperature-independent resistance of 20 μΩ below 20 K. Similarly, this resistance anomaly can be shifted to lower temperatures progressively by applying external magnetic fields, resembling a typical superconducting transition. Measurements on sample #3 in CAC reproduce the resistance drop at pressures above 10 GPa and realize the zero resistance below 10 K at 15 GPa even though an unusual semiconducting-like behavior retains in the normal state. Based on these results, we constructed a dome-shaped superconducting phase diagram and discussed some issues regarding the sample-dependent behaviors on the pressure-induced high-temperature superconductivity in the La3Ni2O7 crystals.

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Emergence of High-Temperature Superconducting Phase in Pressurized La₃Ni₂O₇ Crystals

Hou 侯,

Yang 杨,

Liu 刘

et al. 2023

Chinese Phys. Lett.

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“…Oxygen vacancies are evident in samples with the upturn of resistance observed at ambient pressure. [49] It is clear that the electronic behavior of this system undergoes rapid changes. In samples with higher oxygen content (𝛿 ≤ 0.08), recent spectroscopic results indicated that charge and spin density waves occur at approximately 120 K and 150 K, [13][14][15][16]50] respectively, consistent with the transport measurements on single crystal samples.…”

Section: Reviewmentioning

confidence: 99%

Normal and Superconducting Properties of La₃Ni₂O₇

Wang 王,

Wen 闻,

Wu 吴

et al. 2024

Chinese Phys. Lett.

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This review provides a comprehensive overview of current research on the structural, electronic, and magnetic characteristics of the recently discovered high-temperature superconductor La3Ni2O7 under high pressures. We present the experimental results for synthesizing and characterizing this material, derived from measurements of transport, thermodynamics, and various spectroscopic techniques, and discuss their physical implications. We also explore theoretical models proposed to describe the electronic structures and superconducting pairing symmetry in La3Ni2O7, highlighting the intricate interplay between electronic correlations and magnetic interactions. Despite these advances, challenges remain in growing high-quality samples free of extrinsic phases and oxygen deficiencies and in developing reliable measurement tools for determining diamagnetism and other physical quantities under high pressures. Further investigations in these areas are essential to deepening our understanding of the physical properties of La3Ni2O7 and unlocking its superconducting pairing mechanism.

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“…When the result of electrical properties in nickelate La 3 Ni 2 O 7+δ under high-pressure conditions up to 18.5 GPa was reported at the 21st AIRAPT conference at Catania, Italy in Sep. 2007, it did not attract much attention due to the result that indicated pressure-induced enhancement of the insulating phase. Drama occurred after 16 years when the signature of superconductivity near 80 K in this exact nickelate system under high pressure was reported online in July, 2023, in which high-quality single-crystal samples were synthesized after many years of efforts, and the electronic occupancy of Ni 2.5 in this Ruddlesden–Popper double-layered perovskite nickelate La 3 Ni 2 O 7 might to some extent mimic the Cu 2+ of hole-doped bilayer high T c cuprates, indicating that the nickel-oxide system enables the study of high T c superconductors and helps in understanding its unconventional high T c superconductivity mechanism.…”

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confidence: 99%

Structure Responsible for the Superconducting State in La₃Ni₂O₇at High-Pressure and Low-Temperature Conditions

Wang,

Li,

Xie

et al. 2024

J. Am. Chem. Soc.

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Very recently, a new superconductor with T c = 80 K has been reported in nickelate (La 3 Ni 2 O 7 ) at around 15−40 GPa conditions (Nature, 621, 493, 2023), which is the second type of unconventional superconductor, besides cuprates, with T c above liquid nitrogen temperature. However, the phase diagram plotted in this report was mostly based on the transport measurement under lowtemperature and high-pressure conditions, and the assumed corresponding X-ray diffraction (XRD) results were carried out at room temperature. This encouraged us to carry out in situ high-pressure and low-temperature synchrotron XRD experiments to determine which phase is responsible for the high T c state. In addition to the phase transition from the orthorhombic Amam structure to the orthorhombic Fmmm structure, a tetragonal phase with the space group of I4/ mmm was discovered when the sample was compressed to around 19 GPa at 40 K where the superconductivity takes place in La 3 Ni 2 O 7 . The calculations based on this tetragonal structure reveal that the electronic states that approached the Fermi energy were mainly dominated by the e g orbitals (3d z 2 and 3d x 2 −y 2 ) of Ni atoms, which are located in the oxygen octahedral crystal field. The correlation between T c and this structural evolution, especially Ni−O octahedra regularity and the in-plane Ni−O−Ni bonding angles, is analyzed. This work sheds new light to identify what is the most likely phase responsible for superconductivity in double-layered nickelate.

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Pressure studies on the electrical properties in R_2-xSr_xNi_1-yCu_yO_4+δ(R=La, Nd) and La₃Ni₂O_7+δ

Cited by 17 publications

References 20 publications

Emergence of High-Temperature Superconducting Phase in Pressurized La₃Ni₂O₇ Crystals

Emergence of High-Temperature Superconducting Phase in Pressurized La₃Ni₂O₇ Crystals

Normal and Superconducting Properties of La₃Ni₂O₇

Structure Responsible for the Superconducting State in La₃Ni₂O₇at High-Pressure and Low-Temperature Conditions

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Pressure studies on the electrical properties in R2-xSrxNi1-yCuyO4+δ(R=La, Nd) and La3Ni2O7+δ

Cited by 17 publications

References 20 publications

Emergence of High-Temperature Superconducting Phase in Pressurized La3Ni2O7 Crystals

Emergence of High-Temperature Superconducting Phase in Pressurized La3Ni2O7 Crystals

Normal and Superconducting Properties of La3Ni2O7

Structure Responsible for the Superconducting State in La3Ni2O7at High-Pressure and Low-Temperature Conditions

Contact Info

Product

Resources

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Pressure studies on the electrical properties in R_2-xSr_xNi_1-yCu_yO_4+δ(R=La, Nd) and La₃Ni₂O_7+δ

Emergence of High-Temperature Superconducting Phase in Pressurized La₃Ni₂O₇ Crystals

Emergence of High-Temperature Superconducting Phase in Pressurized La₃Ni₂O₇ Crystals

Normal and Superconducting Properties of La₃Ni₂O₇

Structure Responsible for the Superconducting State in La₃Ni₂O₇at High-Pressure and Low-Temperature Conditions