Thermal expansion of the heavy fermion borocarbide YbNi<sub>2</sub>B<sub>2</sub>C

Schmiedeshoff, G. M.; Lounsbury, Amanda W.; Luna, D J; Okraku, E W; Tracy, S. J.; Bud’ko, Sergey L.; Canfield, Paul C.

doi:10.1088/1742-6596/150/4/042177

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…The saturation of α 100 for T > 100 K is most likely due to CEF effects of higher energy levels combined with simple lattice effects. Similar α(T ) behavior at high temperatures has been shown in YbAl 3 and YbNi 2 B 2 C[50,51]. The anomaly near 5 K can be related to the first excited state due to CEF effects, where the lattice contribution can be ignored at low temperatures.…”

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confidence: 72%

Magnetic-field-tuned quantum criticality of the heavy-fermion system YbPtBi

et al. 2013

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In this paper, we present systematic measurements of the temperature and magnetic field dependences of the thermodynamic and transport properties of the Yb-based heavy fermion YbPtBi for temperatures down to 0.02 K with magnetic fields up to 140 kOe to address the possible existence of a field-tuned quantum critical point. Measurements of magnetic field and temperature dependent resistivity, specific heat, thermal expansion, Hall effect, and thermoelectric power indicate that the AFM order can be suppressed by applied magnetic field of H c ∼ 4 kOe. In the H − T phase diagram of YbPtBi, three regimes of its low temperature states emerges: (I) AFM state, characterized by spin density wave (SDW) like feature, which can be suppressed to T = 0 by the relatively small magnetic field of H c ∼ 4 kOe, (II) field induced anomalous state in which the electrical resistivity follows ∆ρ(T ) ∝ T 1.5 between H c and ∼ 8 kOe, and (III) Fermi liquid (FL) state in which ∆ρ(T ) ∝ T 2 for H ≥ 8 kOe. Regions I and II are separated at T = 0 by what appears to be a quantum critical point. Whereas region III appears to be a FL associated with the hybridized 4f states of Yb, region II may be a manifestation of a spin liquid state.

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confidence: 72%

Magnetic-field-tuned quantum criticality of the heavy-fermion system YbPtBi

et al. 2013

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“…An alternative estimate can also be obtained by averaging values among similar systems (CeAl 3 , YbNi 2 B 2 C, YbAlB 4 ) found in literature. The mean of their volume thermal expansion coefficient β between 0 and 300 K is 5 × 10 −6 K −1 (∆L(T → 0)/L ≈ −0.15%) [68][69][70].…”

Section: Tuning Of T N By Strain On Meander #2 and Bar #1mentioning

confidence: 99%

Microstructuring YbRh₂Si₂ for resistance and noise measurements down to ultra-low temperatures

et al. 2022

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he discovery of superconductivity in the quantum critical Kondo-lattice system YbRh2Si2 at an extremely low temperature of 2 mK has inspired efforts to perform high-resolution electrical resistivity measurements down to this temperature range in highly conductive materials. Here we show that control over the sample geometry by microstructuring using focused-ion-beam (FIB) techniques allows to reach ultra-low temperatures and increase signal-to-noise ratios (SNR) tenfold, without adverse effects to sample quality. In five experiments we show four-terminal sensing resistance and magnetoresistance measurements which exhibit sharp phase transitions at the Néel temperature, and Shubnikov-de-Haas (SdH) oscillations between 13 T and 18 T where we identified a new SdH frequency of 0.39 kT. The increased SNR allowed resistance fluctuation (noise) spectroscopy that would not be possible for bulk crystals, and confirmed intrinsic 1/f -type fluctuations. Under controlled strain, two thin microstructured samples exhibited a large increase of TN from 67 mK up to 188 mK while still showing clear signatures of the phase transition and SdH oscillations. SQUID-based thermal noise spectroscopy measurements in a nuclear demagnetisation refrigerator down to 0.95 mK, show a sharp superconducting transition at Tc = 1.2 mK. These experiments demonstrate microstructuring as a powerful tool to investigate the resistance and the noise spectrum of highly conductive correlated metals over wide temperature ranges.

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