Possible non-Fermi-liquid behavior of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CaRuO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Klein, Lior; Antognazza, L.; Geballe, T. H.; Beasley, M. R.; Kapitulnik, A.

doi:10.1103/physrevb.60.1448

Cited by 112 publications

(99 citation statements)

References 19 publications

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“…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.…”

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confidence: 85%

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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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confidence: 85%

“…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: 54%

Ferromagnetic quantum phase transition in Sr_1−xCa_xRuO₃ thin films

Schneider

Moshnyaga

Gegenwart

2010

Physica Status Solidi (b)

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“…In (Sr,Ca) 2 RuO 4 , our recent µSR studies 57 have revealed that non-Fermi-liquid behavior in resistivity appears above the magnetic freezing temperature, suggesting that charge scattering via spin fluctuations as the origin of this behavior. Klein et al 58 reported non-Fermiliquid behavior in resistivity of CaRuO 3 , with the T 1.5 dependence below T ∼ 50 K. The absence of static magnetic order is consistent with this observation.…”

Section: B Behavior Indicating First-order Transitionssupporting

confidence: 62%

Muon spin relaxation and susceptibility measurements of an itinerant-electron system Sr1−xCaxRuO
Gat-Malureanu
¹
,
Carlo
²
,
Goko
³

et al. 2011
Phys. Rev. B
21
0
9
0
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“…All of the cubic-type ARuO 3 perovskites (A = Ca, Sr, Ba) are metallic to lowest measured temperatures. SrRuO 3 and BaRuO 3 are Stoner ferromagnets with Curie temperatures of T C = 160 and 60 K respectively [4,5,6,7], but CaRuO 3 shows non-Fermi liquid behaviour without a magnetic transition [8]. Another ruthenate perovskite, PbRuO 3 , was synthesised at high pressures in 1970 [9], but the electronic properties of this material have not been reported.…”

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confidence: 99%

Metal-Insulator Transition and Orbital Order inPbRuO3

Kimber

Rodgers

et al. 2009

Phys. Rev. Lett.

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Anomalous low temperature electronic and structural behaviour has been discovered in and metallic conductivity at 290 K are similar to those of SrRuO 3 and other ruthenate perovskites, but a sharp metal-insulator transition at which the resistivity increases by four orders of magnitude is discovered at 90 K. This is accompanied by a first order structural transition to an Imma phase (a = 5.56962(1), b = 7.74550(1), c = 5.66208(1) Å at 25 K) that shows a coupling of Ru 4+ 4d orbital order to distortions from Pb 2+ 6s6p orbital hybridization.The Pnma to Imma transition is an unconventional reversal of the group-subgroup symmetry relationship. No long range magnetic order is evident down to 1.5 K. Electronic structure calculations show that hybridization of Pb 6s6p and Ru 4d orbitals and strong spin-orbit coupling stabilise this previously hidden ground state for ruthenate perovskites.

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Possible non-Fermi-liquid behavior ofCaRuO3

Cited by 112 publications

References 19 publications

Ferromagnetic quantum phase transition in Sr_1−xCa_xRuO₃ thin films

Ferromagnetic quantum phase transition in Sr_1−xCa_xRuO₃ thin films

Muon spin relaxation and susceptibility measurements of an itinerant-electron system Sr1−xCaxRuO
Gat-Malureanu
¹
,
Carlo
²
,
Goko
³

et al. 2011
Phys. Rev. B
21
0
9
0
View full text Add to dashboard Cite

Metal-Insulator Transition and Orbital Order inPbRuO3

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Possible non-Fermi-liquid behavior ofCaRuO3

Cited by 112 publications

References 19 publications

Ferromagnetic quantum phase transition in Sr1−xCaxRuO3 thin films

Ferromagnetic quantum phase transition in Sr1−xCaxRuO3 thin films

Muon spin relaxation and susceptibility measurements of an itinerant-electron system Sr1−xCaxRuOGat-Malureanu1, Carlo2, Goko3 et al. 2011Phys. Rev. B21090View full textAdd to dashboardCite

Metal-Insulator Transition and Orbital Order inPbRuO3

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Ferromagnetic quantum phase transition in Sr_1−xCa_xRuO₃ thin films

Ferromagnetic quantum phase transition in Sr_1−xCa_xRuO₃ thin films

Muon spin relaxation and susceptibility measurements of an itinerant-electron system Sr1−xCaxRuO
Gat-Malureanu
¹
,
Carlo
²
,
Goko
³

et al. 2011
Phys. Rev. B
21
0
9
0
View full text Add to dashboard Cite