Evolution of transport and magnetic properties near the ferromagnetic quantum critical point in the series<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Ca</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mi mathvariant="normal">Ru</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn

Khalifah, Peter G.; Ohkubo, I.; Christen, H. M.; Mandrus, David

doi:10.1103/physrevb.70.134426

Cited by 74 publications

(68 citation statements)

References 20 publications

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“…As displayed in Fig. 1, the so-derived T C data indicate a clear and systematic evolution from a FM in ground state at x = 1 towards a paramagnetic ground state at x = 0.8, in good agreement with [6,7]. For a closer analysis of the magnetic properties close to the FM QPT it would be required to measure for each film the substrate contribution before the synthesis and to explore the exact positions of T C (x) by Arrott-plot analysis.…”

supporting

confidence: 70%

“…As shown in Fig. 2b for x = 1, the resistivity between 2 and 10 K could be described by a T 3/2 dependence, similar as found previously for thin films [6,9] as well as single crystals in the same temperature range [4,10]. The extension of the x = 1 data towards lower T is discussed later.…”

supporting

confidence: 67%

“…The system Sr 1−x Ca x RuO 3 represents a rare example of an oxide NFL metal that displays an itinerant electron ferromagnetic (FM) QPT [4,5,6]. Although the general trend of a continuous suppression of ferromagnetism with increasing Ca concentration is well established, details close to the QPT differ substantially in previous reports.…”

mentioning

confidence: 48%

“…For larger x, the signature becomes very weak and disappears. The residual resistivity ratios of 29 and 16 for x = 0 and x = 1, respectively, are much better compared to those reported in [6,9] and indicate the good quality of the films. The lowest RRR value, is found for x = 0.5 (cf.…”

mentioning

confidence: 61%

“…Copyright line will be provided by the publisher Introduction Quantum phase transitions (QPTs) in weak itinerant ferromagnets have recently attracted much interest due to the discovery of exciting low-temperature states such as unconventional superconductivity [1], partial magnetic order [2] or non-Fermi liquid (NFL) phases [3]. The system Sr 1−x Ca x RuO 3 represents a rare example of an oxide NFL metal that displays an itinerant electron ferromagnetic (FM) QPT [4,5,6]. Although the general trend of a continuous suppression of ferromagnetism with increasing Ca concentration is well established, details close to the QPT differ substantially in previous reports.…”

mentioning

confidence: 99%

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Ferromagnetic quantum phase transition in Sr_1−xCa_xRuO₃ thin films

Schneider

Moshnyaga

Gegenwart

2010

Physica Status Solidi (b)

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The ferromagnetic quantum phase transition in the perovskite ruthenate Sr 1−x Ca x RuO 3 is studied by lowtemperature magnetization and electrical resistivity measurements on thin films. The films were grown epitaxially on SrTiO 3 substrates using metalorganic aerosol deposition and characterized by X-ray diffraction and room temperature scanning tunneling microscopy. High residual resistivity ratios of 29 and 16 for x = 0 and x = 1, respectively, prove the high quality of the investigated samples.We observe a continuous suppression of the ferromagnetic Curie temperature from T C = 160 K at x = 0 towards T C → 0 at x c ≈ 0.8. The analysis of the electrical resistivity between 2 and 10 K reveals T 2 and T 3/2 behavior at x ≤ 0.6 and x ≥ 0.7, respectively. For undoped CaRuO 3 , the measurement has been extended down to 60 mK, revealing a crossover to T 2 behavior around 2 K, which suggests a Fermi-liquid ground state in this system. Copyright line will be provided by the publisher Introduction Quantum phase transitions (QPTs) in weak itinerant ferromagnets have recently attracted much interest due to the discovery of exciting low-temperature states such as unconventional superconductivity [1], partial magnetic order [2] or non-Fermi liquid (NFL) phases [3]. The system Sr 1−x Ca x RuO 3 represents a rare example of an oxide NFL metal that displays an itinerant electron ferromagnetic (FM) QPT [4,5,6]. Although the general trend of a continuous suppression of ferromagnetism with increasing Ca concentration is well established, details close to the QPT differ substantially in previous reports. Early studies on sintered polycrystals have suggested a FM quantum critical point at x = 0.7 [5]. Subsequent Muon-spin rotation measurements on the same crystals have proven that the magnetically ordered volume fraction at low-T decreases from 100% upon increasing Ca content x well before T C → 0 [7], indicating magnetic phase separation. Most interestingly, similar behavior has also been found near the pressure-driven first-order QPT in MnSi [7]. On the other hand, magnetization measurements on flux grown single crystals have shown FM order beyond x = 0.8 with a smooth crossover to spin-glass-like behavior at larger x, extending towards x = 1 [4]. Electrical resistivity measurements on thin films, prepared by pulsed-

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supporting

confidence: 70%

supporting

confidence: 67%

mentioning

confidence: 48%

mentioning

confidence: 61%

mentioning

confidence: 99%

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Ferromagnetic quantum phase transition in Sr_1−xCa_xRuO₃ thin films

Schneider

Moshnyaga

Gegenwart

2010

Physica Status Solidi (b)

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Enhancement of Extraordinary Size Effect on CaRuO₃ Ultrathin Films

Sakoda

Kouda

Shinya

et al. 2023

Adv Elect Materials

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In a previous report, 25 Å periodic metal–insulator transitions dependent on the thickness of CaRuO3 ultrathin films were discovered. Compared to the conventional size effect caused by quantum wells, the rate of change is a few billions of times greater at low temperatures. Although the electrical resistivity of insulating state differs by several orders with the film thickness, the enhancement trigger was not clarified. In this study, it is clarified that the magnitude of the extraordinary size effect varies with the element supply ratio owing to precise control of the molecular beam rates of calcium and ruthenium. The supplied calcium over ruthenium ratio Ca/Ru = 1.2–1.8 during CaRuO3 deposition results in a stoichiometric ratio of Ca:Ru = 1:1 on the CaRuO3 films. Calcium‐rich elemental supply conditions result in large electrical resistivity variations. Electrical resistivity oscillations with periods of T = 23.4 and 26.3 Å are observed for the growth conditions of Ca/Ru = 1.2 and 1.6, respectively. Furthermore, a flat surface with a roughness of ≈2 Å is required to observe the size effect. Thus, the insulation of an extraordinary size effect is enhanced in CaRuO3 ultrathin films grown under the condition of calcium‐rich Ca/Ru ≈ 1.6.

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Structural stratification of Sr_1 − xCa_xRuO₃ thin films: Influence of aging process

Młynarczyk

Szot

Poppe

et al. 2012

Physica Status Solidi (a)

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Epitaxial Sr 1 À x Ca x RuO 3 thin films were grown on SrTiO 3 and LaAlO 3 substrates with use of high pressure dc-sputtering. A number of complementary methods: X-ray diffraction (XRD), Rutherford backscattering (RBS), high resolution transmission electron microscopy (HRTEM), time-of-flight secondary ion mass spectrometry (ToF-SIMS), atomic force microscopy (AFM), and X-ray photoemission spectroscopy (XPS) was used to characterize both in-depth and lateral structure features. Fully strained thin films were obtained with a tetragonal lattice cell pronouncedly elongated in an out-of-plane direction, independent on details of deposition conditions. Growth types varied from a single layer-by-layer two-dimensional (2D) mode to three-dimensional (3D) spiral precipitations of different size. Interface layer between the substrate and the thin film as well as its surface suffer from considerable deviations from nominal stoichiometry, basically resulting from Ru deficiency. Samples stored under normal conditions undergo further compositional change of the surface region. The process of aging, extended over several days, involves incorporation of water and carbon dioxide present in an ambient atmosphere and a subsequent surface reconstruction. For samples deposited on SrTiO 3 the valence band is indicative of a metallic character of the sample interior regardless of Ca content. The heterogeneous in-depth profile of the thin films is extremely important in fabrication of nanodevices, especially those based on ultrathin layers. Examination summary of Sr 0.8 Ca 0.2 RuO 3 thin films, deposited on SrTiO 3 , methods used and essential conclusions.

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Evolution of transport and magnetic properties near the ferromagnetic quantum critical point in the seriesCaxSr1−xRuO3

Cited by 74 publications

References 20 publications

Ferromagnetic quantum phase transition in Sr_1−xCa_xRuO₃ thin films

Ferromagnetic quantum phase transition in Sr_1−xCa_xRuO₃ thin films

Enhancement of Extraordinary Size Effect on CaRuO₃ Ultrathin Films

Structural stratification of Sr_1 − xCa_xRuO₃ thin films: Influence of aging process

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Evolution of transport and magnetic properties near the ferromagnetic quantum critical point in the seriesCaxSr1−xRuO3

Cited by 74 publications

References 20 publications

Ferromagnetic quantum phase transition in Sr1−xCaxRuO3 thin films

Ferromagnetic quantum phase transition in Sr1−xCaxRuO3 thin films

Enhancement of Extraordinary Size Effect on CaRuO3 Ultrathin Films

Structural stratification of Sr1 − xCaxRuO3 thin films: Influence of aging process

Contact Info

Product

Resources

About

Ferromagnetic quantum phase transition in Sr_1−xCa_xRuO₃ thin films

Ferromagnetic quantum phase transition in Sr_1−xCa_xRuO₃ thin films

Enhancement of Extraordinary Size Effect on CaRuO₃ Ultrathin Films

Structural stratification of Sr_1 − xCa_xRuO₃ thin films: Influence of aging process