From valence fluctuations to long-range magnetic order in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>EuPd</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi>Si</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ge</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
 single crystals

Peters, Ian Marius; Kliemt, Kristin; Ocker, Michelle; Wolf, B.; Puphal, Pascal; Tacon, M. Le; Merz, Michael; Lang, Michael; Krellner, C.

doi:10.1103/physrevmaterials.7.064405

Cited by 2 publications

(4 citation statements)

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“…In fact, a full characterization of the magnetic and thermodynamic properties of EuPd 2 (Si 1−x Ge x ) 2 for x = 0.2 by means of magnetization and specific heat performed in Ref. [10], provides clear evidence for a phase transition at T N = (47.5 ± 0.1) K into longrange antiferromagnetic order. As we will demonstrate below, this assignment is consistent with the response obtained under hydrostatic pressure.…”

Section: Resultsmentioning

confidence: 99%

“…Details of the single crystals growth and sample characterization are given in Refs. [9,10]. In what follows we refer to the crystals by their nominal Ge-concentration and specify the crystal by giving the batch number.…”

Section: Methodsmentioning

confidence: 99%

“…We attribute this difference to small variations of the crystals' Ge-concentrations, for details see Refs. [9,10]. As discussed above, the sharp kink-like anomaly in the magnetic susceptibility can be assigned 022.5 to the phase transition into long-range antiferromagnetic order below T N = (47.5 ± 0.1) K. Upon applying He-gas pressure of p = 0.03 GPa (orange full circles) and p = 0.05 GPa (yellow full circles), the character of the transition in χ mol (T ) is retained, except a reduction of the susceptibility at higher temperatures and around T N and a small slight rounding of the kink anomaly at T N .…”

Section: Exhibits a P-t Phase Diagram Displaying T N (P) (Dark-red Op...mentioning

confidence: 99%

“…According to magnetic- [8] and thermodynamic [4] measurements on powder material, EuPd 2 Si 2 is located on the high-pressure side of the second-order critical endpoint, i.e., in the valence-change crossover regime. This material has become of interest recently due to the availability of single crystals of pure EuPd 2 Si 2 [3,9] and Ge-substituted EuPd 2 (Si 1−x Ge x ) 2 [10] which opens up exciting possibilities for detailed investigations by using a wide range of experimental tools. The motivation of the present study has been to identify a suitable chemical modification in the series EuPd 2 (Si 1−x Ge x ) 2 , corresponding to EuPd 2 Si 2 at a negative chemical pressure, so that the critical regime can be accessed via fine pressure tuning by using He-gas techniques.…”

Section: Introductionmentioning

confidence: 99%

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From magnetic order to valence-change crossover in EuPd$_2$(Si$_{1-x}$Ge$_x$)$_2$ using He-gas pressure

Wolf

Spathelf

Zimmermann

et al. 2023

SciPost Phys. Proc.

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We present results of magnetic susceptibility and thermal expansion measurements performed on high-quality single crystals of EuPd_22(Si_{1-x}1−xGe_xx)_22 for 0 \leq x \leq≤x≤ 0.2 and temperatures 2 K \leq T \leq≤T≤ 300 K. Data were taken at ambient pressure and finite He-gas pressure pp\leq≤ 0.5 GPa. For x = 0x=0 and ambient pressure we observe a pronounced valence-change crossover centred around T'_VT′V\approx≈ 160 K with a non-magnetic ground state. This valence-change crossover is characterized by an extraordinarily strong pressure dependence of dT'_VT′V /dpp = (80 \pm 10)±10) K/GPa. We observe a shift of T'_VT′V to lower temperatures with increasing Ge-concentration, reaching T'_VT′V\approx≈ 90 K for x = 0.1x=0.1, while still showing a non-magnetic ground state. Remarkably, on further increasing xx to 0.2 we find a stable Eu^{(2+\delta)+}(2+δ)+ valence with long-range antiferromagnetic order below T_NTN = (47.5 \pm± 0.1) K, reflecting a close competition between two energy scales in this system. In fact, by the application of hydrostatic pressure as small as 0.1 GPa, the ground state of this system can be changed from long-range antiferromagnetic order for pp<< 0.1 GPa to an intermediate-valence state for pp\geq≥ 0.1 GPa.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Exhibits a P-t Phase Diagram Displaying T N (P) (Dark-red Op...mentioning

confidence: 99%