Effects of magnetic field and pressure on the intermediate valence state of YbPd.

Journal of physics. Condensed matter : an Institute of Physics journal · 2010 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3292

Study snapshot

PublicationJournal of physics. Condensed matter : an Institute of Physics journal · 2010

Study typeother

Reported directionUnclear

Evidence ratingInsufficient

Abstract

High field magnetization, magnetoresistance and pressure effects of magnetic susceptibility, thermal expansion and electrical resistivity were examined for the intermediate valence system YbPd, which undergoes two first-order transitions at T(1) = 125 K and T(2) = 105 K. Analyses of high field magnetization suggest that half of the Yb atoms have magnetic moments below 100 K up to 55 T. The Yb valence state and the first-order transitions are stable up to 55 T. On the other hand, T(1) and T(2) decrease with increasing pressure and the first-order transitions disappear at around 4 GPa. Above the critical pressure, the experimental results suggest that the intermediate valence state persists down to the lowest temperature or a heavy fermion state is formed. We will show that most experimental results are explained reasonably by assuming the first-order transitions as a valence order transition of Yb. The magnetic ordering temperature is decreased with increasing pressure, in contrast to other Yb intermediate valence or Kondo systems. This may be correlated with the instability of the valence ordered state in this compound.

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Study typeother

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

High-field magnetization, magnetoresistance, and pressure-dependent measurements were performed in YbPd, which has first-order transitions at T1=125 K and T2=105 K. The Yb valence state and the first-order transitions were reported as stable up to 55 T, while T1 and T2 decreased with increasing pressure and the first-order transitions disappeared around 4 GPa; above this critical pressure, results suggested persistence of an intermediate valence state to low temperature or formation of a heavy fermion state.

Outcomes measured

magnetization
magnetoresistance
magnetic susceptibility
thermal expansion
electrical resistivity
valence state stability
first-order transition temperatures (T1, T2)
magnetic ordering temperature

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": null,
    "source": "laboratory magnetic field and pressure",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "magnetization",
    "magnetoresistance",
    "magnetic susceptibility",
    "thermal expansion",
    "electrical resistivity",
    "valence state stability",
    "first-order transition temperatures (T1, T2)",
    "magnetic ordering temperature"
  ],
  "main_findings": "High-field magnetization, magnetoresistance, and pressure-dependent measurements were performed in YbPd, which has first-order transitions at T1=125 K and T2=105 K. The Yb valence state and the first-order transitions were reported as stable up to 55 T, while T1 and T2 decreased with increasing pressure and the first-order transitions disappeared around 4 GPa; above this critical pressure, results suggested persistence of an intermediate valence state to low temperature or formation of a heavy fermion state.",
  "effect_direction": "unclear",
  "limitations": [],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "YbPd",
    "intermediate valence",
    "high magnetic field",
    "pressure",
    "magnetization",
    "magnetoresistance",
    "magnetic susceptibility",
    "thermal expansion",
    "electrical resistivity",
    "valence order transition",
    "heavy fermion"
  ],
  "suggested_hubs": []
}

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Identifiers and source

DOI: 10.1088/0953-8984/22/37/375601
PubMed: 21403202

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