Electronic properties of a URhGe single crystal

Prokeš, K.; Tahara, Tetsuya; Echizen, Y.; Takabatake, Toshiro; Fujita, Toshizo; Hagmusa, I. H.; Klaasse, J.C.P.; Brück, E.H.; Boer, F.R. de; Diviš, M.; Sechovský, V.

doi:10.1016/s0921-4526(01)01037-7

Cited by 41 publications

(52 citation statements)

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“…This additional contribution was also observed in the specific heat measurements and described in terms of an enhanced electronic contribution. 12 In the ferromagnetically ordered state below T C ϭ9.7 K, the temperature dependence of the volume expansion closely resembles that of the specific heat, as shown in Fig. 3.…”

Section: Discussionmentioning

confidence: 57%

Dilatometry study of the ferromagnetic order in single-crystalline URhGe

et al. 2003

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Thermal expansion measurements have been carried out on single-crystalline URhGe in the temperature range from 2 to 200 K. At the ferromagnetic transition ͑Curie temperature T C ϭ9.7 K), the coefficients of linear thermal expansion along the three principal orthorhombic axes all exhibit pronounced positive peaks. This implies that the uniaxial pressure dependencies of the Curie temperature, determined by the Ehrenfest relation, are all positive. Consequently, the calculated hydrostatic pressure dependence dT C /dp is positive and amounts to 0.12 K/kbar. In addition, the effective Grüneisen parameter was determined. The low-temperature electronic Grüneisen parameter ⌫ sf ϭ 14 indicates an enhanced volume dependence of the ferromagnetic spin fluctuations at low temperatures. Moreover, the volume dependencies of the energy scales for ferromagnetic order and ferromagnetic spin fluctuations were found to be identical.

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Section: Discussionmentioning

confidence: 57%

Dilatometry study of the ferromagnetic order in single-crystalline URhGe

et al. 2003

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“…The size of the ordered moments is 0.35-0.4 µ B /U-atom [1,12] and 0.07 µ B /U-atom, respectively, which is approximately twice as large as m 0 of the polycrystalline samples in agreement with an uniaxial anisotropy. The smooth variation of T C and M S (see Fig.4) indicates the magnetic structure remains Ising-like over the whole concentration range.…”

Section: Discussionmentioning

confidence: 73%

“…In Fig.4b URhGe [12] and UCoGe [2], respectively. The experimental values reported in Fig.4b largely exceed A FL , notably with a factor ~20 and ~200 for x = 0 and 1, respectively.…”

Section: Discussionmentioning

confidence: 98%

“…The ordered magnetic moment, m 0 , amounts to 0.20 µ B /U-atom (powder averaged value) [1,11,12] and the magnetic entropy, S mag , calculated by integrating the 5f electron specific heat ∫C 5f /TdT up to a temperature of approximately 1.5×T C amounts to 0.46×Rln2 (here R is the gas constant) [12,13]. This, together with the small ratio m 0 /p eff ~ 0.1 (the effective moment p eff ~ 1.7 µ B /U-atom [11,12]) confirms the itinerant nature of the ferromagnetic state. For UCoGe the weak ordered moment m 0 = 0.02-0.03 µ B /U-atom and the much reduced value of the magnetic entropy, S mag = 0.04×Rln2, reveal the proximity to a ferromagnetic quantum critical point [2].…”

Section: Introductionmentioning

confidence: 99%

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Ferromagnetic order in U(Rh, Co)Ge

Huy

Visser

2009

Solid State Communications

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Abstract:We report the variation of ferromagnetic order in the pseudo-ternary compounds URh 1-x Co x Ge (0 ≤ x ≤ 1). Magnetization and transport data taken on polycrystalline samples show that the Curie temperature T C gradually increases with increasing Co content from a value of 9.5 K for URhGe to a maximum value of 20 K for x = 0.6 and then steadily decreases to 3 K for UCoGe. The magnetic interaction strength varies smoothly across the series. For all samples the electrical resistivity for T < T C follows the behaviour ρ = ρ 0 + AT 2 . The A coefficient is dominated by scattering at spin waves and is strongly enhanced for x = 0 and 1.

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“…The magnetic entropy of UIrGe Smag = 0.21R ln2 27) is comparable to that of URhGe 28) but significantly larger than Smag = 0.003R ln2 of UCoGe 9) . Figure 1 suggests that the contraction of the unit cell volume and the reduction of the distance dU-U by hydrostatic pressure may drive the UIrGe compound to a magnetic instability.…”

Section: Introductionmentioning

confidence: 76%

Effect of Pressure on Magnetism of UIrGe

et al. 2017

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We report the effect of hydrostatic pressure on the electronic state of the antiferromagnet UIrGe, which is isostructural and isoelectronic with the ferromagnetic superconductors UCoGe and URhGe. A series of electrical resistivity measurements in a piston-cylinder-type cell and a cubic-anvil cell were performed at hydrostatic pressures up to 15 GPa. The Néel temperature decreases with increasing pressure. We constructed a p-T phase diagram and estimated the critical pressure pc, where the antiferromagnetism vanishes, as  12 GPa. The antiferromagnetic/paramagnetic transition appears to be first order. We suggest a scenario of competing antiferromagnetic inter-J-and ferromagnetic intra-J*-chain interactions in UIrGe. A moderate increase in the effective electron mass was detected in the vicinity of pc. A discussion of the electronic specific heat  and electron-electron correlation term A using the KadowakiWoods relation is given.

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Electronic properties of a URhGe single crystal

Cited by 41 publications

References 20 publications

Dilatometry study of the ferromagnetic order in single-crystalline URhGe

Dilatometry study of the ferromagnetic order in single-crystalline URhGe

Ferromagnetic order in U(Rh, Co)Ge

Effect of Pressure on Magnetism of UIrGe

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