Ferromagnetic Cluster Glass Phase Embedded in a Paramagnetic and Metallic Host in Non-Uniform Magnetic System CaRu1−xScxO3

Yamamoto, Takafumi; Kotani, Atsuhiro; Nakajima, Hiroshi; Okazaki, Renji; Taniguchi, Hiroki; Mori, Shigeo; Terasaki, Ichiro

doi:10.7566/jpsj.85.034711

Cited by 9 publications

(7 citation statements)

References 29 publications

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“…These behaviors in M (T ) are the characteristics of the formation of the FM cluster-glass state; it is expected that the FM clusters develop and start interacting (or freezing) below ∼ T ir , and the majority of the FM clusters then freeze below ∼ T * , yielding the very small and large hysteresis below T ir and T * , respectively, in M (T ) between the FC and ZFC conditions. These features are also observed in the other cluster-glass systems [35,36].…”

Section: A Magnetic Propertiessupporting

confidence: 67%

Avoided quantum criticality and cluster-glass formation in itinerant ferromagnet Sr$_{1-x}$(La$_{0.5}$K$_{0.5}$)$_x$RuO$_3$

Iwahara,

Sugawara,

Honma

et al. 2020

Preprint

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We demonstrate that the cluster-glass state emerges as ferromagnetic quantum criticality is avoided in itinerant ferromagnet Sr1−x(La0.5K0.5)xRuO3. In this compound, the ferromagnetic order is suppressed by increasing x, and then disappears at the critical concentration: x = 0.5. In this x range, the present study reveals that no prominent feature is ascribed to the quantum critical fluctuations in specific heat. Instead, ac magnetic susceptibility exhibits a broad peak due to spontaneous spin freezing, and the peak temperature depends significantly on the frequency of the applied ac magnetic field. Furthermore, specific heat is enhanced within a wide temperature range, whereas specific heat shows no salient anomaly associated with spin freezing. These features are characteristics of the formation of cluster-glass; in particular, the observed frequency variations in ac magnetic susceptibility are well described by the Vogel-Fulcher law. We compare the features concerning the suppression of the ferromagnetic order in this doped compound with those in isostructural Ca-and La-doped SrRuO3, and suggest that a local correlated disorder effect and the very small coherence of itinerant Ru 4d electrons are responsible for the cluster-glass formation instead of the quantum phase transition in Sr1−x(La0.5K0.5)xRuO3.

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Section: A Magnetic Propertiessupporting

confidence: 67%

Avoided quantum criticality and cluster-glass formation in itinerant ferromagnet Sr$_{1-x}$(La$_{0.5}$K$_{0.5}$)$_x$RuO$_3$

Iwahara,

Sugawara,

Honma

et al. 2020

Preprint

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“…In addition, MR(H, 2 K) shows a hysteretic curve with a sign change in low magnetic fields. These features correspond to the magnetization M. 11) As shown in the inset of Fig. 2, the magnetic hysteresis curve strongly correlates with the MR(H, 2 K) curve.…”

Section: Resultsmentioning

confidence: 66%

“…No jump at Tc is seen in zero magnetic field, indicating a magnetic glassiness. [20][21][22] Our dynamic magnetic measurements 11) have suggested that the Sc-induced ferromagnetism results from a cluster glass state with a long relaxation time. A similar featureless specific heat has been reported in CaRu1-xTixO3.…”

Section: Resultsmentioning

confidence: 90%

“…For this purpose we focus on the orthorhombic perovskite ruthenate CaRu0.8Sc0.2O3, which shows a weak ferromagnetic glassy state with metallic conduction. 10,11) Figure 1(a) shows the inverse magnetic susceptibility H/M of CaRu1-xScxO3. 10) Whereas CaRuO3 (x = 0) is paramagnetic down to the lowest temperature, CaRu0.8Sc0.2O3 (x = 0.2) shows a steep drop in H/M at around Tc ~ 30 K, indicating the onset of the ferromagnetism.…”

Section: Introductionmentioning

confidence: 99%

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Magneto-thermopower in the Weak Ferromagnetic Oxide CaRu_0.8Sc_0.2O₃: An Experimental Test for the Kelvin Formula in a Magnetic Material

et al. 2017

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We have measured the resistivity, the thermopower, and the specific heat of the weak ferromagnetic oxide CaRu0.8Sc0.2O3 in external magnetic fields up to 140 kOe below 80 K. We have observed that the thermopower Q is significantly suppressed by magnetic fields at around the ferromagnetic transition temperature of 30 K, and have further found that the magneto-thermopower ΔQ (H, T) = Q(H, T) − Q(0, T) is roughly proportional to the magneto-entropy ΔS (H, T) = S(H, T) − S(0, T). We discuss this relationship between the two quantities in terms of the Kelvin formula, and find that the observed ΔQ is quantitatively consistent with the values expected from the Kelvin formula, a possible physical meaning of which is discussed.

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“…The glassy state of CRO clusters could be confirmed by the measurement of AC magnetic susceptibility. [ 35 ]…”

Section: Discussionmentioning

confidence: 99%

Density Functional Theory‐Based Prediction of the Pressure‐Dependent Magnetic Properties of CaRuO₃

Zhang

Yue

Zhang

et al. 2021

Physica Status Solidi (b)

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Using the density functional theory with the plane‐wave ultrasoft pseudopotentials method within the local density approximation (LDA), the magnetic structure of CaRuO3 (hereafter referred to as CRO) is studied as a function of hydrostatic pressure. The calculated results show that: 1) the compressive stress does not cause the disappearance of the ferromagnetic (FM) ground state of cubic CRO but only reduces the magnetic ordering energy and magnetic moment per formula unit, and that 2) the orthorhombic CRO with the Pbnm structure is just in the critical region of the FM, antiferromagnetic (AF), and paramagnetic ground states. Although there is no evidence of an AF phase of CRO at low temperature, the calculated results show that an AF interaction does exist between the Ru atoms of CRO. This can explain the negative Weiss temperature of CRO and the abnormal behavior of the magnetic susceptibility of CRO at low temperature. The AF interaction and the sensitivity to the crystal structure may be the reasons for the various properties of CRO.

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Ferromagnetic Cluster Glass Phase Embedded in a Paramagnetic and Metallic Host in Non-Uniform Magnetic System CaRu₁₋_xSc_xO₃

Cited by 9 publications

References 29 publications

Avoided quantum criticality and cluster-glass formation in itinerant ferromagnet Sr$_{1-x}$(La$_{0.5}$K$_{0.5}$)$_x$RuO$_3$

Avoided quantum criticality and cluster-glass formation in itinerant ferromagnet Sr$_{1-x}$(La$_{0.5}$K$_{0.5}$)$_x$RuO$_3$

Magneto-thermopower in the Weak Ferromagnetic Oxide CaRu_0.8Sc_0.2O₃: An Experimental Test for the Kelvin Formula in a Magnetic Material

Density Functional Theory‐Based Prediction of the Pressure‐Dependent Magnetic Properties of CaRuO₃

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Ferromagnetic Cluster Glass Phase Embedded in a Paramagnetic and Metallic Host in Non-Uniform Magnetic System CaRu1−xScxO3

Cited by 9 publications

References 29 publications

Avoided quantum criticality and cluster-glass formation in itinerant ferromagnet Sr$_{1-x}$(La$_{0.5}$K$_{0.5}$)$_x$RuO$_3$

Avoided quantum criticality and cluster-glass formation in itinerant ferromagnet Sr$_{1-x}$(La$_{0.5}$K$_{0.5}$)$_x$RuO$_3$

Magneto-thermopower in the Weak Ferromagnetic Oxide CaRu0.8Sc0.2O3: An Experimental Test for the Kelvin Formula in a Magnetic Material

Density Functional Theory‐Based Prediction of the Pressure‐Dependent Magnetic Properties of CaRuO3

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Ferromagnetic Cluster Glass Phase Embedded in a Paramagnetic and Metallic Host in Non-Uniform Magnetic System CaRu₁₋_xSc_xO₃

Magneto-thermopower in the Weak Ferromagnetic Oxide CaRu_0.8Sc_0.2O₃: An Experimental Test for the Kelvin Formula in a Magnetic Material

Density Functional Theory‐Based Prediction of the Pressure‐Dependent Magnetic Properties of CaRuO₃