Pressure effect on successive magnetic transitions in a frustrated compound YbAgGe

Umeo, Kazunori; Yamane, K.; Muro, Yuji; Katoh, K.; Niide, Yuzuru; Ochiai, Akira; Takabatake, Toshiro

doi:10.1016/j.physb.2005.01.012

Cited by 7 publications

(8 citation statements)

References 7 publications

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“…1b). These kinks are the signature of the onset of a magnetically ordered state [17][18][19][20][21][22][23] and suggest that a quantum phase transition from NM to MO state occurs between 8.9 and 11 GPa, as discussed below.…”

Section: Electrical Resistivity Measurementsmentioning

confidence: 86%

Quantum Criticality of CePt and YbFe₂Ge₂Heavy Fermions under Pressure

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Baggio-Saitovitch

et al. 2007

J. Phys. Soc. Jpn.

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This work reports the study of the quantum criticality of the ferromagnetic (FM) CePt Kondo lattice and the new non-magnetic YbFe2Ge2 heavy fermion compound using electrical resistivity measurements under high pressures (P ≤ 20 GPa). Pressure drives these systems to different types of magnetic quantum critical point, at different critical pressures (Pc): FM-QCP for CePt (Pc ∼12.1 GPa) and AF-QCP YbFe2Ge2 (Pc ∼9.4 GPa). Despite of that, the quantum critical behavior of both compounds at the two sides of the zero temperature transition is dominated by two dimensional (2D) spin fluctuations.

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Section: Electrical Resistivity Measurementsmentioning

confidence: 86%

Quantum Criticality of CePt and YbFe₂Ge₂Heavy Fermions under Pressure

Fontes

Baggio-Saitovitch

et al. 2007

J. Phys. Soc. Jpn.

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“…6) By applying pressure above 0.5 GPa, the resistivity anomalies at T M1 and T M2 merge into a sharp drop at T M = 0.85 K. 4) In the pressure range of 0.5 < P < 1.5 GPa, however, T M is constant. For P > 1.5 GPa, T M increases abruptly.…”

Section: Introductionmentioning

confidence: 97%

“…4,5) In the case of YbAgGe, the Yb ions form a quasikagome lattice in the hexagonal c plane of the ZrNiAl-type structure. This compound undergoes two magnetic phase transitions at T M1 = 0.8 K (second order) and T M2 = 0.65 K (first order).…”

Section: Introductionmentioning

confidence: 99%

Pressure-Induced Magnetic Phase Transitions in Yb-Based Heavy-Fermion Compounds

et al. 2007

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We report a detailed study of the pressure (P)-temperature (T) phase diagrams of two Yb-based heavy-fermion compounds, namely, the antiferromagnet YbAgGe and weak ferromagnet YbRhSb. YbAgGe with a quasikagome lattice of Yb ions undergoes two magnetic phase transitions at T M1 = 0.8 K (second order) and T M2 = 0.65 K (first order). With increasing pressure (P) up to 0.5 GPa, the transitions at T M1 and T M2 merge into one transition. For 0.5 < P < 1.6 GPa, T M2 remains constant and abruptly rises above 1.6 GPa. This rise occurs with a significant change in the specific heat anomaly from a small cusp at T M2 into a large peak at T M3 . This finding suggests that the suppressed magnetic entropy is released due to geometrical frustration at ambient pressure. On the other hand, YbRhSb undergoes a transition into an unusual magnetic state at T M1 = 2.7 K, which is associated with a small spontaneous moment of 3 10 -3 B /Yb. Measurements of the resistivity, specific heat, and ac magnetic susceptibility ac reveal that the application of pressure above 0.9 GPa induces another magnetic transition at T M2 below T M1 . T M2 (P) exhibits a V-shaped minimum of 1.8 K at P C = 1.6 GPa. With increasing pressure up to 2 GPa, the significant enhancement of the peak height of ac suggests that the canted antiferromagnetic state below P C changes to a ferromagnetic state with a large magnetic moment above P C . These complex P-T phase diagrams for YbAgGe and YbRhSb are explained in terms of the competition among distinct types of magnetic interactions, magnetic frustration, and crystal field anisotropy.

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“…10,11) and a frustrated antiferromagnet YbAgGe (T N = 0.8 K). [12][13][14] In YbRh 2 Si 2 , one finds that the critical spin fluctuations associated with the low-moment state persist beyond the QCP up to a pressure of about 10 GPa, above which the system undergoes a first-order magnetic phase transition to a highmoment state with a high magnetically ordered temperature (T M ) of about 7.5 K. 10,11 A different pressure dependence of T M has been observed in YbAgGe. Here, T M (P ) remains constant for 0.5 < P <P * = 16 GPa, while T M (P > P * ) increases linearly as P increases to 3.2 GPa.…”

Section: Introductionmentioning

confidence: 98%

“…Here, T M (P ) remains constant for 0.5 < P <P * = 16 GPa, while T M (P > P * ) increases linearly as P increases to 3.2 GPa. 12,13 The sudden increase in T M (P > P * ) was attributed to the partial release of the magnetic frustration in the quasi-kagome lattice.…”

Section: Introductionmentioning

confidence: 99%

Interplay between crystal electric field and magnetic exchange anisotropies in the heavy-fermion antiferromagnet YbRhSb under pressure

et al. 2012

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We report the pressure effect on the magnetic ground state of the heavy-fermion (HF) canted antiferromagnet YbRhSb (orthorhombic ε-TiNiSi-type) by means of magnetization and resistivity measurements using a single crystal. At ambient pressure, this compound undergoes a transition at T M1 = 2.7 K into a canted antiferromagnetic (AF) state with a small spontaneous moment of 3 × 10 −3 μ B /Yb. With increasing pressure P above 1 GPa, another magnetic transition occurs at T M2 above T M1 , and T M1 (P ) has a deep minimum of 2.5 K at 1.7 GPa. For P 2 GPa, the canted AF structure changes to a ferromagnetic (FM) one, where a large moment 0.4 μ B /Yb lies in the orthorhombic b-c plane and a metamagnetic transition occurs at B || a = 1.5 T. This unusual FM state below T M3 ∼ = 4.3 K is ascribed to the balance between the single-ion crystalline electric field (CEF) anisotropy with easy direction || a and the intersite exchange interaction with easy b-c plane. Furthermore, we have investigated the pressure dependence of T M3 up to 20.4 GPa using electrical resistivity measurements. The structural stability under pressures up to 19 GPa was examined by x-ray diffraction. We find that T M3 above 2.5 GPa steeply increases up to about 7 K, showing a broad maximum and then slightly decreases with increasing pressure above 8 GPa, while the structure remains unchanged. We attribute the enhancement of T M3 above 2.5 GPa to an increase of the CEF anisotropy with respect to magnetic exchange anisotropy. Finally, we compare and discuss the volume dependence of magnetic phase diagram of YbRhSb with the isostructural HF ferromagnet YbNiSn.

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Pressure effect on successive magnetic transitions in a frustrated compound YbAgGe

Cited by 7 publications

References 7 publications

Quantum Criticality of CePt and YbFe₂Ge₂Heavy Fermions under Pressure

Quantum Criticality of CePt and YbFe₂Ge₂Heavy Fermions under Pressure

Pressure-Induced Magnetic Phase Transitions in Yb-Based Heavy-Fermion Compounds

Interplay between crystal electric field and magnetic exchange anisotropies in the heavy-fermion antiferromagnet YbRhSb under pressure

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Pressure effect on successive magnetic transitions in a frustrated compound YbAgGe

Cited by 7 publications

References 7 publications

Quantum Criticality of CePt and YbFe2Ge2Heavy Fermions under Pressure

Quantum Criticality of CePt and YbFe2Ge2Heavy Fermions under Pressure

Pressure-Induced Magnetic Phase Transitions in Yb-Based Heavy-Fermion Compounds

Interplay between crystal electric field and magnetic exchange anisotropies in the heavy-fermion antiferromagnet YbRhSb under pressure

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Product

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Quantum Criticality of CePt and YbFe₂Ge₂Heavy Fermions under Pressure

Quantum Criticality of CePt and YbFe₂Ge₂Heavy Fermions under Pressure